A Graphical Equation Writer
Contents
1. 44 16 4 44 16 5 MARKING EXPRESSION 45 16 6 su wie 45 16 7 EON TMOG 45 16 8 45 16 9 46 M 46 1611 AND WINDOWS 46 16 12 KEYBOARD PROGRAMS aereto IEEE NEEE SEEE 46 16 13 SWITCHING APPLICATION 47 IO MEE E E 47 48 17 1 48 VARER 1 CVT 48 17 2 28 Ric NEP 48 I 21 48 17 3 EON r T 49 Td E A tan 49 ETD TEN TI VC aaa E cc on uie m ur eu NAE E EOE EO au OAT AATE OONA 50 17 4 51 17 4 1 anv ER CU RM HORS Hebe EUN UU FR rp Cr Y mer E popu pn PY MR Ta iR Mn 51 IX express lOn Coca nto Mcr p de 32 PIAS DISC commana SITNE 22 User Manual for EQW Page 4 1 30 02 1744 23 17 5 28 Bil c M ossing dunes Saeed AE 55 LON v J3 17 6 i292 E 55 AIW angen ea ges 55 I5 TROUBLESHOOTING wrcssesccccccu2. ccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccsccccccccccccecs 32 Il SAVING 35 11 1 EXAMPLE DIFFERENCES BETWEEN STO AND SAVE COPY eres reser e nes 35 11 2 VIEWING THE CONTENT OF A VARIABLE sees ene 37 IEEE 40907 82318 37 12 1 USING STORED EXPRESSIONS AS FORMG csccscceccecceccecceccuccecceccecceceucescceccsccecescesccescsscsscsecsecsccssessesecscencensens 38 12 2 USING STRINGS AS FORM 38 IX TE VIEW SCREEN E58 occorse Aa EEOAE 38 14 LOCAL AND GLOBAL VARIABLES eseesecsessssesscssssossosessosessossesessessesessoseosossssesssososesessessesessosesesssssosessssessoso 39 15 CUSTOMISING THE LOW O 39 15 1 TAE FORMAT MENU EET AARNA AANS 39 ISTE 40 INN TE EE 40 41 15 2 USING THE STANDARD CUSTOM MENUS ccccsccecceeceececcecceccnscescscceccnccesceccscceccsconscascascsecssceececcuscaecesceceuconsens 42 15 3 KEYBOARD PROGRAMS 42 16 EQW KEYS AND FUNCTIONS ccccssosccsscsccccsscsscccscsesccccssessocccscsscsccscsescocccsescoscssescoscsscssscccssscccsesessoscesesscess 43 16 1 CURSOR MOVEMENTS 43 16 2 duds SION 44 16 3 EXPBESSION EVALUATION
3. Home Y Editor Graph Table Data Matrix Program Editor Text Editor Numeric Solver IMPORTANT As long as Keyboard Shortcut is set to ON the EQW or Flash applications installed before the EQW can not be uninstalled This means that you have to set Keyboard Shortcut to OFF before you can delete the EQW or other Flash applications installed before the EQW Flash Applications installed after the EQW are not influenced by the Keyboard Shortcut User Manual for EQW Page 40 1 30 02 The hotkeys defined by the EQW are two key combinations which are not used by the system DIAMOND Copies the marked expression to Clipboard Opens the EQW for editing of a new expression Pasting the content of the clipboard into the EQW If nothing is marked then the EQW will be started with the current content of the Clipboard If the marked is not a valid expression or the clipboard contains an invalid expression then this command will result in an error in the EQW DIAMOND CLEAR Continues editing of an open expression variable This is the same as selecting Current in the Flash Application menu Example Passing an entry zm the Home history area into the EQW This picture shows the Home screen The m me cosit cursor is moved to the second answer in ssolve cos e tit 1 0 t the History area sfactorlt t 1 2 6 1 2 amp B 1 4 DIAMONDIIC fr expression f
4. E 9 DP 9 4 INSIALLINGAND UNINSTALLUING wai cevericeesececsvescisncceedeceieseniicd 11 11 S MEDII 11 LA sate taps tiene vel E 11 4 4 MESSI RECEIVER TE 12 duis ance ia rev tO o a 12 MEE RN CIL 2D 13 Idd Vid he Tash Appa on MENU 13 3 1 2 O H scones 13 32 Mar earn Tras saner rr Terrien trier freer rr smn T 13 20 Vakbond SOT OU E RENTE IT TT TT TT RET I3 3o EUG TE 8 Dn 14 5 3 1 Exiting and passing the content of the editor to Home 14 JENTERING EXPRESSIONS eu uabute ev rdc pei ue sese ven va eel lotos t eu 14 6 1 PLACING PARENTHESIS USING THE CURSOR ieeeeeeee es eaten attt tasas etes assa sas sisse stata tee essa assa 15 6 2 ENTERING 5 n n rrr nnn nenne sess 17 6 2 1 Typing functions commands program names 19 D UNUM CT igi E 20
5. BACKSPACE If placeholder marked Delete element SHIFT UP Swap marked element with element to the left SHIFT DOWN Swap marked element with element to the right Key Description Convert marked expression to a string MATH CATALOG CHAR MODE MEM System menus VAR LINK APPS DIAMOND APPS UNIT System unit menu Units are multiplied to marked expression DIAMOND DIAMOND 9 Executes keyboard programs main eqwprgm1 main eqwprem9 User Manual for EQW Page 46 1 30 02 Switch to the previous active application RCL Recall content of a variable The content of a variable replaces marked expression QUIT Quit to Home ESC Send the contents of the EQW to the entry line and quit to Home F8 Switches to the View Screen DIAMOND Decreases the text size of the displayed expression Large text Medium text Medium text gt Small text Small text Large text User Manual for EQW Page 47 1 30 02 17 API The Application Programming Interface is a group of programs which extends the calculators built in TI Basic language One purpose of these programs is to make it possible for Basic programs to use EQW for input output Another purpose is to make it possible to use Basic programs for customising and extending the EQW 17 1 EQW Current 17 1 1 EQW Current Type Argument Descri
6. In the EQW the cursor is the parentheses In this program you would mark the expression in the EQW where you normally would insert parentheses and the EQW will then insert parentheses if necessary Every operation in the EQW is applied to the marked part of an expression The EQW automatically marks different levels of sub expressions when using the UP DOWN cursor keys Pressing UP marks the sub expression above Pressing DOWN marks the sub expression below This may sound a little cryptic but in fact it is very simple User Manual for EQW Page 14 1 30 02 6 1 Placing parenthesis using the cursor Entering a b c 5 The black square is the placeholder A placeholder indicates that a value is expected and not yet entered The outlined box around the placeholder 1 the cursor The cursor indicates where the next operation will be applied Entering a value will replace the content enclosed by the cursor The cursor 115 outlined when it is at the lowest level of an expression a a4 Entering a character will make the cursor change form to a left arrowhead The arrowhead cursor indicates that you are in the character mode and the next character entered will be placed at the position of the arrowhead Pressing BACKSPACE in the character mode deletes the character to the left of the arrowhead rm 5 Pressing an operator will exit the character mode add a new placeholder and move the cursor to it The next argume
7. Scroll expression up If the View Screen displays more than one line then pressing UP will scroll one line up DIAMOND Decreases the font size of the displayed expression Large text gt Medium text Medium text gt Small text Small text gt Large text The amount of text which can be displayed at a time on the View Screen depends highly on the selected text size The text size of the View Screen is independent of the text size in the editor Selecting Format in the Tools menu and changing the View Text Size is an alternative way to set the text size of the View Screen 14 Local and global variables The TI OS defines two types of variables Local and Global Local variables are variables declared with the Local statement all other variables are global variables When a variable is entered in the EQW by default it 1s interpreted as a global variable Local variables are often used in programs and functions The OS does not allow undefined local variables in expressions but the EQW does A variable can be converted to a local global in the EQW by marking a variable and pressing DIAMOND If the marked variable is a global one then it is converted to a local If it is a local variable then it is converted to a global This function makes it possible to create stored expressions containing undefined local variables for use in programs 15 Customising the EQW 15 1 The Format menu F1 C FORMATS Hubs Ex
8. Marking the expression because we need to add the variable to graph Notice that the 2 t has reappeared as the argument to sinh lar aph i nh 2 t Pressing adds an optional argument to the t Graph sinh ti t4 The expression is now completed and can be executed by pressing ENTER or returned to the entry line by pressing ESC ENTER User Manual for EQW Page 19 1 30 02 6 3 Entering a Matrix Pressing inserts 1x1 matrix around the marked part of expression A matrix in the EQW can marked at three levels 1 The entire matrix 2 A row in the matrix 3 An item in row A column is added to the end of a matrix by marking a row and pressing A row is added to the bottom of a matrix by marking a row and pressing or by marking the entire matrix and pressing Entering a b c d Starting with a blank editor this time It is not necessary to clear the editor because a matrix can be inserted anywhere in an expression 0 The matrix is inserted a 24 Typing first variable hl Adding a column The rules above are the general rules for altering the size In most cases you do not need to mark a row matrix before adding rows columns If the cursor is not marking a function or is inside a function then pressing from any place inside the matrix will add a column row
9. USE COLLAFSE Pressing F7 in the VAR LINK menu will show the installed Flash Applications The above picture shows the Equation Writer with the Basic extensions that are included in the application Pressing F6 when Equation Writer is selected will show the version and copyright information User Manual for EQW Page 11 1 30 02 4 4 Uninstalling the EQW 1 Remove eventually installed EQW hotkeys Hotkeys are removed by selecting Tolls Format F1 C in the and setting Keyboard Shortcut to OFF Press QUIT to exit the EQW Press VAR LINK to activate the menu Press F7 to go to the Flash page Highlight Equation Writer in the list by selecting it Press F1 to activate the Manage menu Press 1 or ENTER to select the Delete item Press ENTER to delete the application CONN NB W WN 5 Starting and exiting The EQW has three different opening starting methods 1 Current 2 Open 3 New Opening the editor with the Current method will let you continue editing from the point where you left off The Open method will let you copy edit the content of an existing variable The editor will be opened with the content of the selected variable War Expr Folder maint War wee ee PS Mode The New method will open a blank editor User Manual for EQW Page 12 1 30 02 5 1 Starting the EQW The EQW can be
10. User Manual for Equation Writer A Graphical Equation Writer for the TI 89 and TI 92Plus EQW version 1 01 Flash Application Display x Fit Fit Fi Fu FE Fa irr Toole Algebrs lalc Other Custom F 9 at X EDI qu n t 15 6 t tl at AUTO EQW program 2002 Creative SW Design User Manual 2002 Creative SW Design User Manual for EQW Page 1 1 30 02 1 DISCLAIMER In no event shall Creative SW Design be liable to anyone for special collateral incidental consequential damages in connection with or arising out of the use of these materials Moreover Creative SW Design shall not be liable for any claim of any kind whatsoever against the use of these materials by any other party User Manual for EQW Page 2 1 30 02 2 Table of Contents DOS ELE dul id oec 2 PE OT CONTEN IS 3 3 INTRODUC TION c M 6 2S1 CONVENTIONS USED IN THIS DOCUMENT 7 3 2 EOW FLASH APPLICATION VS BOW 7 LUN ETT 7 SNP T m 8 Jaa 8 mcd 8 Laa OnE S ed CO E Reem Terr ene Tee ret ere CUR 8 TPS 8 Dou 9 i sre
11. An item in the list An item is added to the end of a list by marking the entire list and pressing Entering a b c 5 Starting with a blank again It is not necessary to clear the editor because a list can be inserted anywhere in the expression User Manual for EQW Page 21 1 30 02 Adding an item to list The rules above are the general rules for altering the size In most cases you do not need to mark the list before adding items If the cursor is not marking a function or is inside a function then pressing from any place inside the list will add an item to the end of list b IT yping second variable in fa b Adding a new item to the list Typing third variable and the list 1 completed 6 6 Entering a string The EQW is not suitable for editing string but it is capable of doing it A dedicated text editor is more suitable for editing text Pressing inserts a list at cursor position If the cursor marks an expression then the expression is converted to a string A list can be marked at two levels 1 The entire string 2 The text in the string Entering t cos t 5 Starting with a blank again It is not necessary to clear the editor because a string can be inserted anywhere in an expression The string is inserted Deleting the placeholder inside the quotation marks using BACKSPACE creates an empty
12. Expressions stored by method 2 and 3 are first evaluated when used This can be used to create variable with special properties 11 1 Example Differences between STO and Save Copy As The differences between the storing methods are best shown by a comparison Let us study the ordinary method of storing into a variable first ENTER Evaluating the expression Now let us open the variable to see what the store operator really has stored into the variable ceiclotherlcustomBecely There pops up the Open window and the variable type folder name and opening SEP JED ee mode can be selected In this case we just Maly want to see what is stored into variable COPYS slv so a copy is fine Enterz k ESC CHHCEL As suspected the variable only contains f20 User Manual for EQW Page 35 1 30 02 o uer new let us try d do the same using the EQW Save Copy As method It is not necessary to mark the function because Copy As always stores the entire expression F1 2 Teols Alaebralcsiclother custon pase This opens the SAVE COPY AS window The Type field shows which type of variable SAVE CUF AS Tupe Expr the expression will be saved as The Folder Folder field shows in which folder the variable will Uariable stored The name of variable to store the expression into must be typed in the Variable field
13. The contents of the EQW can be stored to a variable in three ways 1 Using the STO operator in the EQW and evaluating expressions The STO operator evaluates expressions and the result is stored into a variable 2 Selecting Save Copy As in the Tools menu The Save Copy As function stores the contents of the EQW unevaluated into a variable 3 Opening a variable for editing via the Tools menu Changes made to variables opened this way are automatically saved when the EQW is exited another variable is opened or a new expression 1s created via New The expression is not evaluated before saving Expressions stored by any of these methods can be retrieved unevaluated by use of the Open function in the Tools menu or Flash Application menu The API Open method or the RCL function can also be used to recall an unevaluated variable Using method 2 or 3 to store into a variable give you total control over what is stored and how it 1 stored It is possible via method 2 and 3 to store expressions which are not valid outside the EQW An example of a non valid expression could be a matrix containing a list or another matrix The EQW does not check whether or not an expression is valid outside the before it is saved because expressions stored by the EQW are always valid for the EQW This means that even though an expression 1 invalid outside the EQW it can always be opened and edited by the EQW and potential errors corrected
14. Tools Algebralcaic other custon Baze gt Entering the variable name slv2 sv SAVE AS Expr Folder main 1 Variable Enter zSHUE ESC CHHCEL ENTER TaslslAlacoralcalclother custonibase r Pressing ENTER twice to verify the input ENTER and the window 15 closed The expression is now stored into the variable slv2 The contents of the EQW remain unchanged by this operation Let us now open the variable to see what really was stored this time 50 ti really the contents of variable we get it is not necessary because the editor 15 automatically cleared when a variable is DOWN CLEAR Clearing the EQW just to make sure that it is ENTER menu As expected the variable does contain the saved expression Let us now try to use the created variables from the Entry line Cee lpisebralcsiciither Prsntolciesan ue If the variables are evaluated from the Entry line then they appear to be identical FT 1 A t Opening the variable slv2 via the Tools Male KAD AUTO 2730 User Manual for EQW Page 36 1 30 02 Pee laisebralcsiciotherlPrantolclesn ue 115 first by substitution of the variable f that the difference becomes visible The reason for this difference is easy to find by fH lt 2 p o looking at contents of the variables sslu f t 1
15. t E Typing the first character H t Pressing an operator or function keys inside a string inserts text instead of performing an operation Typing the last two characters and the string is completed User Manual for EQW Page 22 1 30 02 6 7 Inserting subscription Pressing DIAMOND applies subscription to the marked part of an expression Entering a 3 2 Starting with a blank again It is not necessary to clear the editor because a subscription can be inserted anywhere in an expression a a4 Typing the variable The arrowhead indicates that operations will be applied to this single object alone The second index is an optional argument to subscription so it is added by pressing Typing the second index and the expression is completed Press to add the optional argument Minutes Press to add the optional argument Seconds 7 Moving cursor The cursor can be moved in two different Moving Modes 1 Moving between conjugate sub expressions 2 Jumping between single elements of an expression numbers variables fractions and placeholders The first method 1 typically used when an expression is entered modified The second method may often help when moving the cursor to a certain place in a complex expression or when one just wants to change some values The EQW automatically switches between these moving methods therefore it is us
16. Slv contains 0 slu2 men p Ss SIv2 contains solve f 0 t What happens is that the variable P is replaced by t 2 1 in both expressions and the resulting expressions are evaluated MAIN KAD AUTO 11 2 Viewing the content of a variable Due to the EQW being able to store unevaluated expressions the real content of a variable 1 not always revealed by evaluation of the variable see 11 1 The content of a variable can be viewed in the VAR LINK menu or by opening the variable in the EQW WAR LINE BU FiF Fz LS IEEE FERAE ink m E 30 12 KAD AUTO FUNC 50 HAIN KAD AUTO FUNC Press F6 in the VAR LINK menu to view the content of a variable 12 Creating forms You can create use forms within the EQW A form can be any kind of expression where one or more placeholders are not filled in A form can either be a stored expression or a string containing an expression You create a form in exactly same way as a normal expression The only difference is that you do not fill in all placeholders The placeholder you preserve can then be filled in later when the form is used The Vector menu F7 F2 15 an example of how forms can be used in the FEF FF Fu Humber IHnale List Vect or DOF edb 1 PFS Can All of the items in the Vector menu are forms User Manual
17. The program must be placed in the MAIN folder eqwprgml Prgm eqw insert solve eqw x User Manual for EQW Page 51 1 30 02 EndPrgm 17 4 2 EQW Insert expression string Type Argument Description Note Program expression string Converts the expression string to an expression displays the current content of the EQW and replaces the selected text with an expression An expression string can contain any valid expression including Basic commands Expression strings are not simplified Example If the content of the EQW looks as follows Execute fal EQW Insert 44 34 24 1 Result in the EQW 5 EEFEFEF 17 4 8 EQW Insert command string Type Argument Description Program command string Displays the current content of the EQW and inserts the appropriate input form for the command function in the command string with selected text as the first argument command string is a string which contains the exact name of a function or command command string may contain the name of any build in command function or operator command string may also contain the name of an undefined function user defined functions programs or Basic extensions Commands strings are case sensitive and build in commands and function must be written exactly as they appear in system menus Catalog and Math menus The safest way to create a command string is to pick the command function from a sys
18. editor is cleared Variable is opened for editing Variables recalled are just copied into the EQW Variables opened for editing are automatically updated with the content of the EQW by exit of the EQW User Manual for EQW Page 32 1 30 02 lAlasbralcelclother Prantolclean up Storing a matrix into a variable so we have a variable to work with Now let us edit the variable in the EQW a b 4 Al AUTO FUME 1750 DIAMOND The Flash Application menu pops up In this example APPS ae ae the menu only contains the Equation Writer but it might contain more items if there are more Flash Applications installed a b a b 3 mati 4 ix USE 314 0 AMD CESCI CAMCEL Enter 0k ESC CHHCEL In this case we want to edit a matrix so we select Matrix in the menu RIGHT Press RIGHT to activate the Equation Writer Open menu The Open menu gives you three options for opening the EQW Current Lets you continue editing of an e a b expression in the EQW Me 9 d Lets you pick variable to edit TYPE USE 314 ENTERI DIE AND LESCIZCRNCEL New Opens a blank editor DOWN Selecting the Open method The EQW Open dialog is ENTER displayed War 1 Var is a submenu where the type of variable to Folder main open i
19. marked expression with the expression to the left Functions commands lists matrix Swap marked argument with the argument to the left SHIFT IIDOWN Expressions SHIFT UP Expressions Swap marked expression with the expression to the right Functions commands lists matrix Swap marked argument with the argument to the right INS Undo last operation up to ten operations COPY Copy marked expression CUT Cut marked expression PASTE Paste marked expression User Manual for EQW Page 44 1 30 02 16 5 Marking expression lt gt Angel unit conversion and with operators x 1 Insert reciprocal TI 92 191 1 Degree factorial operators Differential and negation operator LN e Logarithm functions Summation TE92 only ans Ho Insert matrices O LL Add column to marked matrix 1 1 1 Addrowto marked matrix O IDIAMOND Add subscription to marked matrix Delete column If row marked Delete row SHIFT UP If matrix element marked BACKSPACE If placeholder marked Swap marked element with element to the left If matrix row marked Swap marked row with the row above SHIFT DOWN If matrix element marked Swap marked element with element to the right If matrix row marked Swap marked row with the row below User Manual for EQW Page 45 1 30 02 16 9 Lists
20. Ce TENG VC OR NOTET Tm 20 Sg PH 2 TET e di ino e sauce etna ve 22 O7 23 6 8 ENTERING DEGREE MINUTES SECONDS 23 7 MOVING CURSOR ciiasan 23 Jl CONTROLLING THE MOY ING MODE EGE a Ea d ae Ud Eea EER aari 24 S8 EDITING AN EXPRESSION 25 Gol MARKING SUB EXPRESSIONS sougiessonbst 25 OLI Marking adjacent exDresstOHSs pada PEE EPA PPP AP 27 5 2 DELETING PARTS OF AN EXPRESSION dad MEHR Unum EM 21 8 2 71 Deleting functions leaving the argument DEI rrt cr RR a EF VERUS 26 8 2 2 Deleting optional arguments BACKSPACE 28 User Manual for EQW Page 3 1 30 02 8 2 3 Deleting single characters BACK SPACE 28 S24 Deleting parts of an expression 28 6 2 5 Deleting rows and columns of a matrix BACKSPACE 29 Bee duci p Ree 29 8 4 UNDOING OPERATIONS ENS 30 9 EVALUATING EXPRESSIONS 30 10 OPENING RECALLING VARTA BLES
21. F7 F2 Number menu contains the same functions as the system MATH Number menu F7 F3 Angle menu contains the same functions as the system MATH Angle menu F7 F4 List menu contains the same functions as the system MATHNList menu F7 F5 The Vector menu can be used to insert vectors some types of vectors can not be inserted in any other way F7 F6 Matrix menu contains the same functions as the system MATH Matrix menu User Manual for EQW Page 10 1 30 02 4 Installing and uninstalling 4 1 Requirements The EQW requires the calculator to operate on AMS v 2 04 or newer versions To transfer of the program to the calculator you need LINK from Texas Instruments 4 2 Files There are two different versions of the EQW One for TI 89 and one for TI 92Plus TI 89 EQW89 89k TI 92Plus EQWO92 0xk 4 3 Transferring files To transfer the program to the calculator using TI GRAPH LINK Activate the Link menu Select the Send Flash Software submenu Select the Application and Certificate submenu item Select the appropriate file Press the button Press the button OK to start transferring files WN When the application is installed it will become visible in several menus VAR LIME EFTashfipr ink contents F1asheer Lr ren et Input Insert Hau 0 Losin
22. activated in three different ways 5 1 1 Via the Flash Application menu 1 Press DIAMOND APPS or APPS ENTER to activate the Flash Application menu 2 Select Equation Writer in the menu 3 Select opening method Current Continue editing an open expression variable Open Open a variable for editing Selecting Open will activate a window where the variable to edit can be chosen see Opening and Saving variables New Open the EQW ready for entering a new expression 5 1 2 Via the API The EQW can also be started from the Entry Line or from the program by executing an API program EQW Current Continue editing of an open expression variable see API functions EQW New Open the EQW ready for entering a new expression see API functions EQW Open V AR Open the variable VAR for editing see API functions 5 2 The start up screen When the EQW is started the screen will look as follows x Toois isebrs csTe ntner uston esse e The menu line at the top of the screen shows the available pull down menus The black square in the centre of the screen is a placeholder Placeholders are used to show where a text can be entered The rectangle surrounding the placeholder is the cursor 5 2 1 Via keyboard shortcuts The EQW is able to install hotkeys which can be used to activate the EQW These hotkeys are by default not installed For information on how to install hotkeys see 15 1 The Format menu User Manual f
23. any operation except single character editing i e the cursor is an arrowhead Up to ten operations can be undone Example Key iE in EQW I T CJ tzin 5 t Regretting the deletion of the denominator in the previous example I can undo the operation INS Bt The placeholder appears again E 1 INS Ot Pressing INS one more time has undone 5131 deletion in the previous example 1 9 Evaluating expressions The EQW has three different key functions for evaluating an expression inside the EQW and a menu function for evaluating expressions from the Home environment ENTER Evaluates the entire expression The format of the result depends on the current mode settings of the calculator This is the same as marking the entire expression and pressing ENTER If there are placeholders in the expression the cursor is moved to the first placeholder and no evaluation takes place This can be used to let the program move the cursor and just fill in the empty fields ENTRY Evaluates the marked part of an expression The format of the result depends on the current mode settings of the calculator If there are placeholders in the marked expression the cursor is moved to the first placeholder and no evaluation takes place DIAMOND ENTER Evaluates the marked part of an expression in an approximate mode If there are placeholders in the marked expression the approx function is i
24. b Typing second variable 3 b Adding TOW c a d IT yping third variable cq RIGHT a bh Pressing LEFT RIGHT moves the cursor to previous next item in a matrix d a b Typing fourth variable and the matrix 1 completed c 94 6 4 Entering vectors User Manual for EQW Page 20 1 30 02 The only way to enter polar cylindrical spherical vectors in the EQW is by selecting them from the Vector menu Pressing F7 F5 activates the Vector menu Fer Fz Fur Humber Angle List k Imc Fl pns TL Friz ANM FI The Vector menu contains row and column vectors in four different formats The formats are rectangular polar cylindrical and spherical Selecting a vector in the menu replaces the marked expression with vector Entering 5 Z260 245 Pressing ENTER to move the cursor to the first placeholder 5 54 zm T yping the first co ordinate RIGHT 5 ce Moving the cursor to the next co ordinate 6 0 5 Entering the second co ordinate RIGHT 5 260 hi Moving cursor to the last co ordinate 1415111 5 260 z Entering the third co ordinate 6 5 Entering a list Pressing inserts a one element list around the marked part of an expression The list can be marked at two levels 1 The entire list 2
25. b expression to the right the single element in the expression cursor is moved up one expression level User Manual for EQW Page 24 1 30 02 8 Editing an expression 8 1 Marking sub expressions As you probably already know are almost all operations applied to the marked part of an expression The way an expression is market can be visualised by a tree where each node represents a cursor position The marked area 1s always the tree seen below a node When the cursor 1s moved it jump between the nodes in tree The UP DOWN cursor keys moves vertical in the tree The LEFT RIGHT cursor keys moves horizontal in the tree If 2 x43 x 5 is entered with following key sequence then the movement tree will look as below 2 L JEXTE ES UP UP x 5 UP 2 5 gt o En G i RIGHT LEFT Now above expression in Bus EQW The expression has been entered The cursor is at the top node of the movement tree and the entire expression is marked User Manual for EQW Page 25 1 30 02 The cursor is moved down to the second node from the top in the left side of the tree Pressing DOWN moves always the cursor along the path to the left in a ramification Pressing DOWN one more time moves the cursor to the bottom left node in the movement tree The cursor is now at the end of this branch and can not be moved further down This can be seen from that the cursor shape has
26. changed to an outlined box UP a Pressing UP moves the cursor to the node above mec gg ES the x node to the right As it can be seen in the movement tree is the node above x the subtract operator The shape of a movement tree and the default marking of sub expressions depends on how an expression is entered If 2 x 3 x 5 from previous example is entered with following key sequence then the movement tree will look as below 2 L JEXTE TES UP UP UP UN o xI 1 5 UP 5 UP Qe S O LEFT RIGHT User Manual for EQW Page 26 1 30 02 8 1 1 Marking adjacent expressions The movement tree does not always allow marking of all combinations of adjacent expressions The problem occurs when there are three or more factors terms an expression The EQW handles this problem by rearranging the tree if necessary There are two keys for marking of adjacent expressions SHIFT LEFT Expand the marked area to the right SHIFT RIGHT Expand the marked area to the left Example marking factors i al b wo Starting with three factors where first 1 marked Now I want to mark the two first factors It might be enough just to press UP but that depends on how the expression 1s entered because there 1s more than two factors SHIFT gu Pressing SHIFT RIGHT marks the second RIGHT factor independent of the way the expression is e
27. e cube Eeubogrd horkcukE OFF Fize Nill Text SHALL Ent amp er Ave lt User Manual for EQW Page 39 1 30 02 15 1 1 Auto Execute Auto Execute control the behaviour of the menus in the EQW If Auto Execute 15 set to OFF then picking a function command in a menu will lead to that a chosen function command is inserted in the expression If Auto Execute is set to ON then the function command is evaluated if possible and the result are inserted It is only by build in functions and commands an evaluation 1 attempted and only if the function command can be evaluated with one argument Auto Execute is default set to OFF Example Behaviour of the function factor Starting with a random fraction Auto Execute is set to OFF Selecting the factor function from the Algebra menu 1728 E Starting with a random fraction again Auto Execute is set to ON Selecting again the factor function from the Algebra menu As it can be seen from the picture this time the result of the factorisation 15 inserted and not the function F2 2 15 1 2 Keyboard Shortcut The EQW is able to install hotkeys which let you access the EQW by a single key press from within other applications Setting Keyboard Shortcut to ON in the Format menu will install hotkeys in following applications Keyboard Shortcut 15 default set to OFF Application
28. e is opened unevaluated Save Copy As Let you save the content of the EQW to a variable The expression is saved unevaluated This function let you create active variables Active variables are first evaluated when used New Create new expression View View the content of the editor in multi line Pretty Print To Home Transfers the marked part of an expression to the Home stack area Format Let you turn Auto Execution on off This mode setting controls the action performed when a function command 1 selected in a menu If Auto Execution is ON the selected function is executed and the result is inserted into the EQW If Auto Execution is OFF the selected function is inserted into the expression Installing of hotkeys The font size used in the editor and in the View Screen can also be changed in via the Format dialog F2 The Algebra menu This menu contains the same functions as the system Algebra menu except a couple of extra trigonometric functions in the Trig submenu The extra trigonometric functions are included in the application but has no special relation to the EQW F3 The Calc menu contains the same functions as the system Calc menu F4 The Other menu contains the same functions as the system Other menu F5 The EQW Custom menu executes the program main eqwuser F6 The Base menu contains the same functions as the system MATH Base menu F7 Activates the secondary toolbar menu
29. e of the Open menu option and setting opening Mode to edit 2 Ifno variable is open for editing in then the resulting expression will be stored in the clipboard and the key press PASTE 1 stored in the keyboard buffer If the user press QUIT the variable ok is set to 0 Note It is possible to enter an expression in the EQW which are not valid The EQW will not check whether or not an expression is valid before it is stored in a variable A variable containing an invalid expression will result in an error when evaluated Program example 1 Following program emulates the program version of the EQW The program will accept different types of arguments see Insert for a description of the argument types The edited expression is returned via the clipboard to the entry line eqw exprl Prgm eqw new clear the editor and make sure that the result will be returned via the clipboard eqw Insert expr1 insert the expression to edit in the EQW eqw Input let the user edit the expression EndPrgm Example eqw x 2 1 ENTER starts the EQW displaying x42 1 The argument is evaluated simplified before it 15 displayed eqw 2434445 ENTER starts the EQW displaying 2434 445 The argument is User Manual for EQW Page 49 1 30 02 Program example 2 17 3 2 EQW Input VAR Type Argument Description Note Program example User Manual for EQW not evaluat
30. e the key MATH is a shifted key which is reached by pressing 2nd 5 DIAMOND the green diamond key SHIFT the shift key LEFT RIGHT UP and DOWN The cursor movement keys The multiplication key EQW Equation Writer A single element a variable number placeholder or fraction The screen shots used in this document is from the TI 92 Plus 3 2 EQW Flash Application vs EQW program This section lists the differences between the Flash Application and the program version of the EQW You can drop this section if you haven t used the program In the Flash Application some key functions have been moved other have been removed to make room for other functions New in the Flash Application is that it can work in split screen mode that will say you can have the EQW in one part of the screen and another application in another part The text size used by the editor can now be changed The EQW has got a View Screen which makes it possible to view larger expressions without having to use scroll through it The application contains a set of new API functions which can be used to customise the EQW The API can be used to create functions menus which works directly with the content of the EQW or send a series key presses to the EQW see API chapter 17 The Flash Application has a number of new functions and menus And some functions have been improved in the Flash version 3 2 1 EQW Hotkeys The EQW can define hotk
31. ed simplified before it is displayed Following program allows the user to edit an expression and stores the resulting expression in the variable result editexpr1 Prgm delvar result clear old result eqw Open result Open the variable result for editing eqw Insert cSolve y x 2 y x y 0 x insert the expression to edit in the EQW eqw Input let the user edit the expression If ok 1 Then if the user pressed ESC then hus do something with the result EndlIf EndPrgm Program Path name of variable to use for input If the variable does not exist it will be created Pauses the program closes eventually open variables in the EQW displays the EQW with the content of the variable VAR and lets the user manipulate the content The program continues when ESC or QUIT is pressed The content of the variable VAR can be of type expression string matrix or list The expression may contain char 255 which will be interpreted as placeholders If ESC is pressed the system variable ok is set to 1 and the content of the EQW will be stored in the variable VAR If QUIT is pressed the variable ok is set to 0 and the content of the variable VAR is undefined It is possible to enter an expression in the EQW which are not valid The EQW will not check whether or not an expression is valid before it is stored in a variable A variable containing an invalid expression will result
32. ethod or the Open menu option 18 7 Unable to delete the EQW or applications installed before the EQW The EQW or apps installed before the EQW can not be uninstalled as long as the EQW have keyboard shortcuts activated To solve this problem turn EQW keyboard shortcuts off Keyboard shortcuts are removed by selecting Tolls Format F1 C in the EQW and setting Keyboard Shortcut to OFF User Manual for EQW Page 57 1 30 02
33. eys which can be used to activate the EQW from build in applications DIAMOND Activate the EQW displaying the marked expression An example of the use of this function could be to start EQW from the history display with the cursor in the history display This will transfer the history item into the EQW DIAMOND CLEAR This just activates the EQW with its current content See The Format menu F1 C 15 1 User Manual for EQW Page 7 1 30 02 3 2 2 New editing functions SHIFT UP SHIFT DOWN SHIFT LEFT SHIFT RIGHT Swap marked sub expression with sub expression to the left This function does also swap arguments of functions commands items in lists matrix and rows in matrix Swap marked sub expression with sub expression to the right This function does also swap arguments of functions commands items in lists matrix and rows in matrix Extends marked area to include adjacent sub expression to the left Extends marked area to include adjacent sub expression to the right 3 2 3 Improved editing functions DEL PASTE Deletes any function command and preserves the argument Rows in matrices can now be copy pasted 3 2 4 Evaluating expressions ENTER ENTRY Evaluates the entire expression in the EQW The exit function has been moved to ESC The ENTER key can as before be used to jump to placeholders Evaluates marked part of expression previous F1 The entry function can be inserted
34. ferring marked expression to Home Marking the sub expression Pressing ENTRY evaluate simplifies the marked part of an expression using current mode settings The sub expression 1 simplified Lt vy The content of the EQW is not changed by this operation Only the content of Home 15 changed CelAlsebralcetclotherleramiolclesan up This picture shows the result of this operation seen from Home The marked expression 15 transferred to Home and executed from there in the same way as when you normally enter expressions and L7 10 27 t 18 t 27 evaluate them but you remain in the EQW t 2 10 xt 2 7 10 Opening Recalling variables Variables opened using one of the EQW opening methods are not simplified before being displayed in the EQW Variables can be opened using different methods Via the Open method in the Flash Application Variables opened for editing are updated The menu editor is cleared The selected variable is either recalled or opened for editing editor is cleared The selected variable 15 either Via the Open method in the EQW Tools menu Variables opened for editing are updated The recalled or opened for editing Via the keyboard function RCL Replaces the marked expression with the content of a variable Variables opened for editing are updated The editor is cleared Variable is opened for editing Variables opened for editing are updated The
35. for EQW Page 37 1 30 02 12 1 Using stored expressions as forms A form 15 created by 1 Entering the expression in the EQW 2 Storing the expression into a variable using Save Copy As the Tools menu This type of form is recalled by opening the variable using Open in the Tools Flash Application menu The API Open Input methods can also be used to open the forms A form can be inserted into the EQW by recalling the variable using RCL 12 2 Using strings as forms A form 15 created by 1 Entering the expression in the EQW 2 Mark the expression 3 Press to convert the expression to a string The result of this is a string form String forms can only be inserted into the EQW by use of the API Insert method This type of form is very suitable for use in menus 13 The View Screen F8 The View Screen displays as much as possible of the current expression in the EQW on a single screen The View Screen will always use the entire screen area for displaying Long expressions are wrapped and displayed on multiple lines The View Screen is activated by pressing F8 or by selecting View in the Tools menu Display Je z z p r f 1500 1500 5 SS jh ELT seno 2 5199 2 2 z 5i z z 4 igo HAIN AUTO FUR User Manual for EQW Page 38 1 30 02 DOWN will scroll one line down Scroll expression down If the View Screen displays more than one line then pressing
36. in an error when evaluated Following program allows the user to enter an expression and stores the resulting expression in the local variable result editexpr2 Prgm Page 50 1 30 02 Local result eqw Input result If ok 1 Then if the user pressed ESC then jus do something with the result EndIf EndPrgm 17 4 EQW Insert 17 4 1 EQW Insert expression Type Program Argument expression Description Evaluates simplifies expressions displays the current contents of the EQW and replaces the selected text with a simplified expression There are two variable names which are reserved by the EQW These variables have a special meaning in expressions char 255 y 1s inserted in the EQW as a placeholder for missing argument Expressions containing not evaluated simplified before they are inserted in EQW Eqw Variables with the name are replaced by the marked expression sub expression in the EQW before the expression is evaluated Note Expressions cannot contain Basic commands Example If the content of the EQW looks like this zin ty costa Execute EQW Insert tan t 2 Result in the EQW 2 3 Program example Following keyboard program defines the key DIAMOND 1 The program solves the marked equation in with respect to x and inserts the result at the cursor position
37. iocsseccccccusicciscsessecacacaxssuscavessceretacavausesennesaccsasosasavebeeccacsoeacaedeioussausentevousserenssecaneeced 57 18 1 THE EQW WILL MARK THE NOMINATOR DENOMINATOR 57 18 1 1 Unevaluated numerical fractions 57 IS ue itte ERR RN TAM Tee 57 18 2 HOW FO ENTER AN EMPEY s Eee E PD tA VAS DER E AD ES UD FOL UM MINE 57 18 3 THE CURSOR DISAPPEARS WHEN INSIDE AN EMPTY STRING eese emen ene hh ene rh ee reser s enn annes 57 18 4 THE EQW WILL NOT DELETE A ee nnn esn nnn ttire 57 18 5 HOW TO CHANGE THE DIRECTION OF A LIMIT iini oai RP ka S HER og GN PA des d UP re GER Se qa Uo d ek be RE Iosue dE dP UE URES 57 18 6 ERROR WHEN TRYING TO USE A VARIABLE CREATED BY THE eene nennen 57 18 7 UNABLE TO DELETE THE EQW OR APPLICATIONS INSTALLED BEFORE THE 57 User Manual for EQW Page 5 1 30 02 3 Introduction EQW is a Graphical Equation Writer for Texas Instruments TI 89 and TI 92Plus calculators With the EQW equations expressions lists and matrix can be entered in a graphical format instead of the normal entry line format This is often a faster and less error prone way to enter and edit complex expressions because they are displayed in the textbook format as they are being typed and each element can be ed
38. ited separately The Equation Writer can edit expressions equations lists vectors matrices and text In this document the expression will be used as a blanket term The EQW can be used as a calculation environment because expressions can be evaluated inside the EQW You can even execute programs and commands in the EQW Expressions can be stored into variables of transferred to the Home entry line Expressions can be Copy Pasted between the EQW and other applications The application includes an extensive API which makes it possible to create advanced menu systems functions in the EQW The API also includes an input function which can be used by other programs to get input from users via the EQW instead of the usual input functions The Equation Writer is a fully integrated Flash Application It is capable of working in all calculator modes including Split Screen mode You can freely switch between the EQW and other applications in the same way as between the built in applications x FiF FiF Fu FE Tonals lHlaebra calc ther Custem Base k User Manual for EQW Page 6 1 30 02 3 1 Conventions used this document In this document it is assumed that you are familiar with the basic operations of your calculator Square brackets are used to indicate keys on the calculator For example the HOME button is written as HOME The key names used are those printed at or above the calculator buttons For exampl
39. ivision s operator that is applied to b instead of the _addition operator Pressing UP marks b c but that is not what we want because pressing now will add d to b c Pressing UP again marks Expressions can be divided to smaller units each of them represents a cursor level In this case the expression can be split up into the single elements a b and c They are at the lowest level It can also be divided into two sub expressions b c and a 6 They are at a higher level because they contain more than one simple element The first sub expression above is b c The next level above b c is b c because it includes both the sub expressions b c and the single element a If the expression b c had been a part of another expression then there would have been further levels above it Each time UP DOWN is pressed the cursor moves one level up down and mark the expression at that level As it can be seen from above examples does the use of cursor keys alter the way expressions are build and the purpose of parenthesis 15 replaced by marking sub expressions User Manual for EQW Page 16 1 30 02 6 2 Entering functions commands programs Functions as operators are always applied to the marked part of an expression A function can have one or more arguments Optional arguments are added by marking the function and p
40. laceholder in the expression Entering a value and pressing ENTER makes the cursor jump to the next placeholder Please note that when there are no more placeholders left ENTER will trigger the evaluation of the entered expression 14 Now the integral is completed and ready to be evaluated by 1 siniz tdt pressing ENTER or to be returned to the entry line by pressing ESC User Manual for EQW Page 17 1 30 02 Example limit f t t 0 1 AA Fed Typing the function name and a starting parenthesis enters an undefined function The starting parenthesis tells the program that it is a function and not a variable You could type in the full function that is also accepted by the EQW RIGHT Pressing cursor key triggers evaluation of input The EQW will recognise that an undefined function has been entered and provides the closing parenthesis and a placeholder Functions selected from menus are also applied to the marked part of the expression t UP TEN The argument t is entered and the function is marked by UP F3 3 lim The limit function is selected from the EQW menu It could also 5 me have been selected from the MATH or CATALOG menu t RIGHT 0 The arguments are entered as in the previous examples lim f tj t 3 Eq aB arguments are per definition added to a function by selecting the function and pressing But in
41. most cases it is enough just to press from anywhere inside the function The direction of a limit 1 a special case of an optional argument Normally optional arguments are added as placeholders but by limits it appears as a small plus You cannot enter anything in the direction field but you can toggle the direction by pressing lim T he direction of a limit is an optional argument Optional User Manual for EQW Page 18 1 30 02 6 2 1 Typing functions commands program names Functions commands and program names can be typed instead of selecting them from menus Example Graph sinh 2 t t Built in commands and functions must be typed exactly as they appear in the CATALOG menu with uppercase and lowercase letters Pressing a cursor key inserts the commands with an appropriate number of placeholders Marking the argument to sinh Typed in functions commands program names are as always applied to marked part of expression s ilEn h Graph zinbh4 Typing in the function Notice that the argument 2 t has disappeared The program doesn t know that you are entering a function and assumes that you are just replacing the expression When the EQW recognises that a function or command has been entered it will return the argument C Graph sinhtd Opening parenthesis must terminate functions and program names However the terminating parenthesis is not necessary by built in functions
42. ng programs which work with the EQW 1 Defining DIAMOND 2 as log key The program must be placed in the main folder eqwprgm2 Prgm eqw insert log EndPrgm 2 Defining DIAMOND 3 as a popup menu with active commands The program must be placed in the main folder An active command is not inserted in the EQW Each menu item will perform an operation on the marked part of the expression in the EQW and replace marked with the result eqwprgm2 Prgm Local var gt PopUp cSolve x cZeros x nSolve x expand x factor if var 1 eqw insert cSolve eqw x if var 2 User Manual for EQW Page 42 1 30 02 eqw insert cZeros eqw x 3 eqw insert nSolve eqw x if var 4 eqw insert expand eqw x if var 5 eqw insert factor eqw x EndPrgm 3 Asimple example of an EQW custom menu Pressing F5 activates the menu The program must be placed in the main folder The program creates a Toolbar with one menu Picking one of the units in the menu will multiply the unit to the marked expression eqwuser Prgm Toolbar Title Units Item m s ul Item m s 2 u2 Item ft s42 u3 EndTBar Return ul Eqw insert eqw m s Return Lbl u2 Eqw insert eqw m s 2 Return Lbl u3 Eqw insert eqw ft s 2 Return EndPrgm 16 EQW keys and functions The EQW support all key function normally available so the Key Map found in the calculator ma
43. nserted and no evaluation takes place F1 5 Transfers the marked part of an expression to the Home environment and executes the expression from there The result will not be returned to the EQW but can be retrieved by evaluating ans 1 in the EQW User Manual for EQW Page 30 1 30 02 Evaluating SMe a 1 0 x using ENTER and DIAMOND ENTER still need to create an equation and insert the solve function Applying the equal operator to the The expression 15 entered but we marked expression to create an equation Entering the right side of the equation Marking the equation so that solve can be applied to the equation Selecting solve from the Algebra menu Notice that the cursor is moved to the placeholder for a second argument so it is ready for entering the argument ENTER Za j m 1 ele If you want to evaluate the entire expression ENTER will do the job When the evaluation is completed the result appears in the EQW ready for further manipulations Let us now find the approximate value of the first result and preserve the second result exact DIAMOND 2 414719 2 i Evaluating the marked expression ENTER in an approximate mode II Fal E E go ec C r ed C 92 a User Manual for EQW Page 31 1 30 02 1 Expanding t 5 42 2 in the denominator of t 3 42 t 5 42 2 42 using ENTRY 2 Trans
44. nt can now be typed in UP 3 b Pressing UP exits the character mode and moves the cursor one level up The cursor is now displayed as an inverse text This indicates that it is no longer at the lowest level of the expression The cursor as always indicates which part of the expression the next operation will be applied to In this case to a b and that is what we want because we want to enter a b 3 h 4 lil Pressing adds a new placeholder where the value to add can be entered The parentheses around a b are not shown because they are implied by the order of operators Parentheses are only shown in the EQW when they are a mathematical necessity c a b tc4 T he expression is now completed and can be returned to the entry line by pressing ESC a b The first part is the same as in previous example just enter b Outlined and left arrow cursors indicate that the next operation applies to that element alone This is what we want in this case since we want to add to b aS h mI Pressing adds a new placeholder as in the previous example but this time there also appear parentheses around b and the placeholder The parentheses are shown because the operators do not imply the calculation order User Manual for EQW Page 15 1 30 02 Entering b c d This is not much different from the previous example This time however is it the d
45. ntered Starting with four terms where the third is marked Now I want to mark the second and third terms It might be enough just to press UP but that depends on how the expression is entered because there is more than two terms Pressing SHIFT LEFT marks the adjacent term to the left independent of the way the expression is entered SHIFT LEFT 8 2 Deleting parts of an expression The EQW has four different keys which can be used to delete parts or all of an expression DEL Deletes functions commands and preserves the argument BACKSPACE Deletes expression characters optional arguments list items rows and columns of matrix CLEAR Deletes expression and single elements DIAMOND CLEAR Deletes the entire expression User Manual for EQW Page 27 1 30 02 8 2 1 Deleting functions leaving the argument DEL RIGHT Marking tan DOWN t 2 remains Deleting tan Notice that the argument sinc2 to pressing BACKSPACE Deleting optional arguments by marking argument and Marking bk The outlined cursor indicates that the item is a single element This means that pressing BACKSPACE will activate character editing mode The black arrowhead indicates that you are in character editing mode In the character editing mode BACKSPACE deletes the character to the left of the arrowhead l Removing the denominat
46. nual is also valid for the EQW There are a few keys however which have a special meaning in connection with the EQW these are the INS and ENTRY keys other keys have the same similar function as normal 16 1 Cursor movements UP DOWN Move one level up down in the expression LEFT RIGHT Move to the left right in the expression 2nd UP Move to the top level of the expression mark everything 2nd DOWN Move to the lowest level of the marked sub expression User Manual for EQW Page 43 1 30 02 BACKSPACE If cursor 1s inverse Delete marked expression If cursor is outlined Enter character editing mode If cursor is at left arrowhead Delete character to the left If placeholder is an optional argument to a function Delete optional argument If placeholder is the only argument to a function Delete placeholder and function If placeholder is an argument to an operator Delete placeholder and operator If placeholder is in column of a matrix Delete column If marked is a row of matrix Delete row Or with other words BACKSPACE will delete almost anything DEL Deletes marked function and leave the argument CLEAR Deletes the marked expression and leave placeholder DIAMOND CLEAR Deletes the entire expression Add optional argument to marked function Add item to marked list Add column to marked row of a matrix Add row to marked matrix Swap
47. or EQW Page 13 1 30 02 5 3 Exiting the EQW The EQW is automatically exited when another application is activated Even though one exits the EQW the content of the editor is not lost The content of the editor will be back if you start the EQW again with the Current method see Starting the EQW The following keys can be used to switch to another application from the EQW Y Switch to the Y editor WINDOW Switch to the Window editor GRAPH Switch to the Home screen TblSet Switch to the Table Set editor TABLE Switch to the Table editor APPS The system application menu 2nd APPS Switch to the previous application DIAMOND APPS The system Flash Application menu MODE Change the current application in the mode window QUIT Quit to Home 5 3 1 Exiting and passing the content of the editor to Home Pressing ESC exits the editor and makes it pass its content to the entry line of the Home application The content will be inserted at the cursor position in the entry line The way it works is similar to Copy Paste to the entry line except it does not involve the Clipboard 6 Entering expressions Entering an expression in the EQW is fairly straightforward However there is one thing which you must get used to the method of entering parentheses Only in very rare cases do you enter parentheses in the EQW In fact the EQW does not like parentheses and will flash an error message if you try to enter them
48. or completely The m 51702 11 denominator is marked BACKSPACE and CLEAR will both delete a marked expression _and preserve the placeholder BACKSPACE Bt i Only BACKSPACE can delete a placeholder EB teins ta oe Deleting a placeholder also removes the operator User Manual for EQW Page 28 1 30 02 Pressing UP when an element in a matrix 15 marked or DOWN when the entire matrix is marked marks a row d e f 1 RIGHT a b c The cursor is moved to the previous next row by pressing LEFT RIGHT g h 1 BACKSPACE srar Pressing BACKSPACE deletes the marked row h i DOWN RIGHT 3 C If one wants to delete the second column first the cursor is moved to an element in the second column h 1 CLEAR a 5 Then the element is cleared When there is placeholder in a column the column can be deleted by deleting the placeholder 0 0 00 0 BACKSPACE Deleting column g 1 8 3 Copy Cut and Paste You can copy paste expressions between the EQW and other applications Expressions can also be copy pasted inside the EQW These functions can be used to reshuffle an expression PASTE or F1 8 Replaces the marked part of an expression with a previous copied or cut expression Note only valid expressions can be pasted into the EQW User Manual for EQW Page 29 1 30 02 8 4 Undoing operations INS The EQW can undo
49. p char 22 amp char 22 amp 0 amp char 22 amp co amp char 23 amp char 16 If the content of the EQW look like this Execute EQW Insert Char 14 amp amp char 24 amp char 24 amp char 23 amp char 24 amp char 22 amp char 22 amp 0 amp char 22 amp co amp char 23 amp char 16 Result in EQW 17 5 EQW New 17 5 1 EQW New Type Argument Description Example 17 6 EQW Open 17 6 1 EQW Open VAR Type Argument Description User Manual for EQW Program non Closes eventually open variables clears the editor and displays the editor EQW New Program Path name of variable to open If the variable does not exist it will be created Closes eventually open variables and opens the variable VAR for editing in the EQW If no folder is given then current folder will be used Page 55 1 30 02 If the variable name is invalid or the variable name is reserved an error will occur Example EQW Open folder myvar User Manual for EQW Page 56 1 30 02 18 Troubleshooting 18 1 The EQW will not mark the nominator denominator of a fraction The EQW handles two types of numerical fractions 18 1 1 Unevaluated numerical fractions Numerical fractions entered in the EQW are threaded as common divisions where nominator and denominator are separate entities 18 1 2 Evaluated fractions Evaluated numerical fractions are fractions which are result of an evaluation by
50. ption Example Program non Displays the current content of the EQW EQW Current 17 2 EQW Get 17 2 1 EQW Get Type Argument Description Note Example Program example Function non Returning the marked expression sub expression from the EQW If the marked expression is not valid then an error will occur If the content of the EQW look like this ath C EQW Get ENTER a b ath TOW EQW Get ENTER C Following keyboard program defines the key DIAMOND 1 The program adds the marked expression in the EQW to the start of the list main eqwsave The program must be placed in the MAIN folder eqwprgml Prgm if GetType main eqwsave LIST gt main eqwsave augment EQW Get main eqwsave main eqwsave EndPrgm User Manual for EQW Page 48 1 30 02 17 3 EQW Input 17 3 1 EQW Input Type Program Argument non Description Pauses the program displays the current content of the EQW and lets you manipulate the content The program continues when ESC or QUIT is pressed If the user press ESC then the system variable ok is set to 1 and the EQW will return the resulting expression using one of two different methods depending on the set up of the editor 1 Ifa variable is open for editing in the EQW then the resulting expression will be stored in the variable The variable may either have been opened using the EQW Open method or by us
51. ressing Optional arguments are removed by marking the argument and pressing BACKSPACE Pressing RIGHT LEFT moves the cursor to the next previous argument Example sin 2 t 1 0 1 Entering the argument to sin You could also insert sin first and then the argument Marking the expression by pressing UP applies SIN to 2 t and not only to t After sin is applied it 1s also included in the marked area This 15 because sin now has taken over the top level Pressing DOWN would mark 2 t again Functions remain marked if no further arguments are required otherwise The cursor jumps to the first missing argument Applying the integral makes three new placeholders appear One for each argument the function requires t HB Pressing RIGHT makes the cursor jump to the next argument Pressing LEFT makes the cursor jump to the previous argument You do not need to fill out the limits of the integral because they are optional arguments Optional arguments can be deleted by pressing BACKSPACE Deleting one of the limits of the integral removes both limits 0 E It may be a little confusing to press RIGHT to jump to the sini tagli nex argument when the argument is above or to the left The 4 ENTER key may be helpful in this case Pressing ENTER y may p 5 when there are placeholders in the expression makes the cursor jump to the first p
52. rom the Home history area has been pasted into the editor 15 1 3 Text Size View Text Size Text Size View Text Size controls the font size used in the editor View Screen The text size can be set to SMALL or MEDIUM or LARGE Pressing DIAMOND D can also be used to change the text size SMALL 4x6 pixel fonts variable size font MEDUM 6 8 pixel fonts fixed size font LARGE 8x10 pixel fonts fixed size font User Manual for EQW Page 41 1 30 02 15 2 Using the standard Custom menus Most standard Custom menus can be used with the EQW Though attempts to insert an invalid expression via a Custom menu will result in an error in the EQW The built in Custom menu has two examples of menu items which are not valid in the EQW These are F2 6 Define f x F3 4 solve and x y CUSTOM Turns the active Custom menu on off To find out more about standard Custom menus look up Custom menu in your calculator manual 15 3 EQW keyboard programs Ten key combinations in the EQW are reserved for customising These keys do nothing else but execute programs with certain names if they exist All EQW keyboard programs must be placed in the MAIN folder There are basically no rules for what type of programs can be used as keyboard programs The API program EQW Insert see 17 4EQW Insert can be used in connection with the keyboard programs to create functions and menus in the EQW Examples of creati
53. s selected Folder is a submenu where folder to pick Sane Sacer variable in is selected CEnter OK 7 SESCSCANCEL Var is a submenu containing all the variables of the selected type in the selected folder Mode 1 submenu where the opening method is selected RIGHT The EQW can edit four types of variables DOWN li example of an expression could be ar DOWN Folder 2 Lists 3 Matrix Mode COPV 4 Strings User Manual for EQW Page 33 1 30 02 ENTER When Matrix is selected the names of all variables in DOWN the selected folder containing matrix appears in the Var DOWN Type Matrix submenu In this case the folder main and the variable DOWN Folder main matl are automatically chosen so we do not need to change them but the opening mode needs to be changed The Opening Mode can either be COPY or EDIT If COPY is selected then the EQW is opened with a copy of the content of the variable The variable will remain unchanged even though you make changes to the content in the EQW If EDIT is selected then the EQW is opened with the content of the variable The variable will be updated by the EQW so it reflects the changes made in the EQW MAIN RAD AUTO FUH ENTER Taslslalaebralcsiciather Customleacelr The is opened displaying the content of the ENTER variable User Manual for EQW Page 34 1 30 02 11 Saving expressions
54. tem menu Some examples of command strings cSolve amp Graph and OneVar z myfolder myprog EQW tToCos Example If the content of the EQW looks like this Execute User Manual for EQW EQW Insert cSolve Page 52 1 30 02 Result in the EQW cSolyelx 5 x 2 0 f 17 4 4 EQW Insert key string Type Argument Description User Manual for EQW Program key string Displays the current content of the EQW and sends the key string as a series of key presses to the application A string is threaded as a key string when the first character in the string has the numeric code 14 The identifier character is not sent Characters with a numeric code between 14 and 31 are translated to other key press before they are sent You can find a list of all character codes in your calculator manual You can get a character with a given numeric code from char Page 53 1 30 02 Key translation table Character codes Key press T Example 1 If the content of the EQW is as follows EQW Insert char 14 amp char 27 this will invoke CLEAR Execute Result in the EQW 1 30 02 User Manual for EQW Page 54 Example 2 This macro will insert the definite integral from zero to infinity with the selected as argument and let you fill in the variable of integration Char 14 amp G amp char 24 amp char 24 amp char 23 amp char 24 am
55. the OS The OS converts all numerical fractions to single entities The EQW will not convert it back by it self This type of fraction can be split into nominator and denominator by pressing BACKSPACE DOWN 18 2 How to enter an empty string An empty string 15 created in two steps 1 Insert the string by pressing 2 Delete the placeholder between the quotation marks using BACKSPACE 18 3 The cursor disappears when inside an empty string The cursor does not disappear it does just not enclose anything the string is empty The cursor is in this case displayed as a line between the quotation marks The cursor indicates that you still can enter text into the string even without a placeholder 18 4 The EQW will not delete a placeholder The EQW will not allow deletion of a placeholder if the resulting expression becomes invalid 18 5 How to change the direction of a limit See the example with limit in the section Entering functions commands programs 6 2 18 6 Error when trying to use a variable created by the EQW It is possible to enter an expression in the EQW which is not valid and the EQW does not check whether or not an expression 15 valid before it 1s stored in a variable A variable containing a non valid expression will result in an error when evaluated Opening the variable in the EQW and correcting the expression will solve the problem Variables containing a non valid expression can only be opened using the EQW open m
56. ually not necessary to control the moving mode User Manual for EQW Page 23 1 30 02 7 1 Controlling the Moving Mode DOWN UP 2nd LEFT 2nd RIGHT 2nd DOWN 2nd UP If the cursor is outlined then the Moving Mode is switched to second else the cursor is moved one level down Moves the cursor one level up and the Moving Mode is switched to the first Moves the cursor to the beginning of the line and the Moving Mode is switched to second That will say the cursor is moved to the first simple element found in the expression Moves the cursor to the end of the line and the Moving Mode is switched to second That will say the cursor is moved to last simple element in the expression Moves the cursor to the first simple element found inside the marked expression and the Moving Mode is switched to second Moves the cursor to the highest level marks the entire expression and the Moving Mode is switched to first LEFT If there is a sub expression to the left then Moves cursor to the next single element to the cursor is moved to sub expression If the left The cursor stops at the first single there is no sub expression to the left the element in the expression cursor is moved up one expression level RIGHT If there is a sub expression to the right then Moves the cursor to the next single element the cursor is moved to sub expression If to the right The cursor stops at the last there is no su
57. using the Other menu 3 2 5 Changing text size DIAMOND 3 2 6 View Screen F8 Decreases the font size used in the editor Large text Medium text Medium text gt Small text Small text gt Large text Activates the View Screen The View Screen displays the content of the editor in compressed format e z E z z E Bu 1 64 iri i Jz z 1 E i 2 29 Al jl 1 2 Use ESC DIAMONDI Above picture shows the TI 92 Plus View Screen displaying the result of expand z 2 z 44 1 3 z using small fonts User Manual for EQW Page 8 1 30 02 3 2 7 Moving cursor The behaviour of the cursor LEFT RIGHT has been changed to make it easier to move between sub expressions 3 2 8 Typing functions 1 Itis no longer necessary to enter the starting parenthesis by build in functions 2 Custom functions can now be entered as function name starting parenthesis 3 2 9 New menus The line menu has been replaced with a toolbar menu MODE The system mode menu The About screen has been moved to the Tools menu APPS The system APPS menu The custom menu has been move to F5 DIAMOND The system Flash Application menu dams MEM The system memory menu User Manual for EQW Page 9 1 30 02 F1 EQW Tools menu Open Let you open a variable in same way as you would open a program in the Program Editor The variabl
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