List of changes in the main GraphiXT executable
Contents
1. IER AbsErr and nEval Those variables are modified by the built in integration functions and provide additional information about the integration that has been performed see the updated user s manual for details A crash that could happen after a runtime error in a built in integration function has been fixed 2013 08 16 A bug that prevented the parameter list from being updated after clicking the button Calculate All has been fixed 2013 08 17 A bug that prevented re calculation of array dependent formulas after clicking the button OK or Apply in the array options dialog window has been fixed 2013 08 18 The following bug has been fixed after changing the time slider position or after entering a new time value in the slider bar the formulas of the current graph that depend on the current time 1 e on the variable t were not recalculated when the current graph window was of f x t type and the X dataset of the formula was not a temporary set of X values 18 19 20 21 22 23 24 29 26 27 28 29 30 31 32 2013 08 19 Floating point exception handling has been added to built in integration functions The default maximum number of subdivisions of the integration interval when executing built in integration functions has been increased from 100 to 200 A bug that prevented update of an array element value during an assignment oper2. 46 2013 12 10 Flicker when redrawing graph windows has been greatly reduced 2013 12 22 Memory leaks have been eliminated 2014 01 03 The maximum allowed length of identifiers of variables arrays and functions has been decreased to 50 characters In the dialog window Nonlinear least squares fitting sizes of three information text boxes and position of the checkbox vary have been changed 2014 01 04 A bug that prevented update of the built in array XC abscissas of free curves after unlinking free curves has been fixed 2014 01 09 A bug that sometimes caused incorrect redrawing of the legend after a change in the number or meaning of model functions caused by a change of model parameters in the parameter editor has been fixed 2014 01 14 Fixed a crash that was possible after a change in the number of global parameters when some of the graphs had formulas depending on interpolated model functions FTn FXn or on interpolated free curves FCn Fixed a crash that was possible after a change in the number or meaning of model functions when a graph had formulas depending on model functions and the data table of that graph was open Fixed a bug that sometimes prevented update of formulas depending on model functions after a change in the number or meaning of model functions caused by a change of model parameters in the parameter editor 2014 01 14 Eliminated a message about compil
3. and NF They contain formula abscissas computed formula values and the number of formulas in each graph respectively Usage of those arrays in programs is similar to usage of arrays XC FC and NFC which refer to free curve data A new system variable curForm has been added That variable is equal to the sequence number of the currently computed formula in the graph window The dialog window with options of a formula has a new checkbox that is used to turn on or turn off saving of formula values in the project file If this option is not selected then the formula will be re calculated every time when the project file is opened The default value of this option can be set using the previously mentioned menu command Tools Options tab Formulas After selecting integration of a formula in the dialog window of elementary data analysis it is now possible to choose the adaptive integration algorithm instead of the interpolation based algorithm the adaptive algorithm is more accurate If the adaptive algorithm has been selected then the formula values that are needed for estimation of the integral will be calculated during integration otherwise the formula will not be re calculated and its plotted values will only be used during integration Added a text editor menu command that makes it possible to modify some properties of the text editor font size saving of editor window size and position and
4. and YY only increase after adding or removing model parameters and functions or after changing the meanings of model parameters and functions Those two numbers must be the same both for the function file and the parameter editor because both those programs must correspond to the same set of model parameters and functions The third component of the function file version number ZZ increases after improving the simulation algorithm or fixing simulation bugs The third component of the parameter editor version number VV increases after improving the parameter editor user interface or fixing its bugs or revising the documentation of the plug in that solves the kinetic equations In the following list of changes the differences between the indicated GraphiXT version and the previous version are listed Note the changes given for the first entry v 1 10 4 3 are the differences from the first English version v 1 00 4 2 which was released in February 2012 1 10 4 3 2012 07 06 1 The nonlinear fitting dialog window has been improved Now the names of parameters functions and datasets as well as parameter values and limits of fitting ranges are shown in respective grid controls whose format is similar to that of Microsoft Excel worksheets in the previous versions of GraphixT linked list boxes were used for that purpose In addition an option to mark each fitted dataset as used or unused has been added 2 In the current vers
5. defaults are stored in the file GraphiXT defaults which is loaded every time during GraphiXT startup If that file is absent or if it is empty then the original defaults will be used The dialog window with axis options has several new controls which make it possible to apply the changes not only to the current graph but also to other graphs or to future projects In the latter case the changes will be saved in the mentioned file GraphiXT defaults When new free curves are created or pasted or imported from text files it is now possible to link them to any existing X dataset In addition during data import it is now possible to select multiple input files In the fitted dataset options dialog window a new error weighting option has been added the errors can now be divided by another dataset that is linked to the same X dataset as the fitted dataset Thus error factors can be specified independently for individual points of the fitted dataset In the slider bar added two checkboxes x sync and x sync all which are used for turning on or turning off the coordinate synchronization mode This is the operation mode when respective X axis limits of two or more coordinate graph windows are equal to each other Seven new built in functions have been added Select Find Find2 Hist Hist2 Root Root2 Three new built in arrays have been added XF FA
6. effort has been put into minimizing the risk that a runtime error in a user program will crash the GraphiXT executable causing loss of all unsaved GraphiXT data Runtime checking for the following types of errors has been added a out of bounds array indices b references to un allocated arrays c abnormally long computation e g due to an infinite loop d infinite recursion e runtime errors related to limitations of certain built in functions An abnormally long computation of a formula value such as caused by an infinite loop is handled by displaying a dialog window with an option to interrupt the computation when a formula value is computed longer than 2 seconds The user can either continue waiting that dialog will be closed automatically after finishing the computation of the current value of the formula or stop the computation by clicking the button Stop calculation at any time In the latter case the current value of the computed formula and all subsequent values in the current sequence of values are set equal to the indeterminate number 1 IND In the program editor window the first detected runtime error is shown by automatically scrolling to the corresponding line of code and highlighting it If the runtime error occurs in a subroutine then the line containing the corresponding call to that subroutine is highlighted in the code of the calling program too For a more convenient access to programming obj
7. is now equal to in previous versions it was equal to 100 divided by the average absolute value of Y in the fitting range 2015 01 27 Fixed the failure to restore initial numbering of curves in a graph window after creating a formula and then closing the code editor window without saving the changes Among other things this bug would sometimes cause the message Encountered an improper argument which could subsequently appear after clicking an item of the legend 2015 02 23 Fixed a bug that sometimes prevented an automatic update of the slider bar after changing the time multiplier in the X axis options dialog 2015 02 24 Fixed a crash after clicking the button Insert before in the subroutine list dialog window 2015 02 27 Fixed an occasional crash after an attempt to close a subroutine code editor window Fixed a bug that prevented automatic recalculation of formulas after changing X dataset properties in the dialog window X datasets 2015 04 07 Fixed a bug that caused incorrect recalculation of the x or y coordinate of the reference point of a text label or a free form line after entering its value in the text box X or Y of the options dialog if the X or Y axis multiplier was not equal to 1 12 60 61 62 2015 04 09 Fixed a bug that sometimes caused incorrect rescaling of the time axis after importing model data from text files 2015 07 28 Fixed a bug that sometimes caus
8. of the dialog window Several bugs have been fixed The GraphiXT user s manual has been partially updated to reflect the recent changes in the program 2014 03 21 Fixed a crash after clicking OK in the text label options dialog window 2014 03 24 The data amount shown in the dialog window Time limits and amount of data is calculated including the data of all formulas and time cross sections Fixed a runtime error that occurred during nonlinear fitting when there were syntax errors in the user defined formula used to calculate the weight factors 2014 03 26 Fixed a bug that sometimes caused inconsistent values of X axis limits of new x graphs i e those limits could be different from respective limits of other x graphs even when the checkbox x sync all was checked 2014 03 28 Fixed an occasional crash after pasting a formula 2014 03 31 Added an option to insert the input data file name into the names of imported free curves Fixed a bug that caused incorrect Y values of imported or pasted free curves when the input data has only one X value and the curves are being linked to an existing X dataset that has more than one element 2014 04 01 Corrected format of error messages that appear after entering an illegal value into a grid control Fixed a bug that sometimes caused empty strings to be copied to clipboard when copying x values from a function data table in partial mode 2014 04
9. that are automatically recalculated are not only the ones that depend on that array explicitly but also all formulas that depend on the built in array FA computed formula values 2014 05 02 Fixed a bug that could in rare cases cause the program to stop responding after importing or pasting free curve data when a function data table is open 2014 05 05 Inserted the command Open table window into the context menu of the formula code editor and into the menu Programming when the formula code editor window is active 2014 05 10 Fixed a crash that sometimes occurred after a floating point exception in the user defined integrand during execution of a built in integration function 2014 05 13 Fixed a bug that caused enabling of the checkbox Apply to the active code window after checking and then un checking the checkbox Apply to all existing programs in the property page Code editor of the property sheet Project defaults even when the current window was not the code editor window 2014 05 18 Fixed a bug that caused incorrect re assignment of an X dataset to a formula after creating a free curve and linking it to an X dataset that previously had only one formula linked to it 2014 05 21 Added a button Import from a file in the dialog window Array properties 2014 05 26 Import of free curve data from multiple text files has been made faster especially if there are formulas th
10. 02 Added an option to insert the input data file name into the name of the imported X dataset 2014 04 06 Corrected an occasional error when pasting data into a function data table 2014 04 11 Added a property page Number format to the property sheet Project defaults That property page contains controls for setting the number of significant digits and the use of decimal exponent in the displayed values of array elements functions their arguments and parameters In addition the parameter value format can be modified in the parameter list by selecting a corresponding command of the context menu 2014 04 13 Changed positions of several controls in the dialog window Fitted dataset options 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 2014 04 19 Fixed an occasional crash after changing X values in a function data table which is in partial mode and then attempting to select a point of a corresponding curve 2014 04 25 Fixed a bug in the dialog window Subroutine name and formal parameters that could cause incorrect interpretation of a list of formal parameters of a subroutine if that list starts with a comment line 2014 04 27 Fixed a crash in the dialog window Subroutines after attempting to paste and replace a subroutine that is open for editing in a code editor window 2014 04 28 After a change of a user defined array the formulas
11. List of changes in the program GraphiXT Below is the list of changes for each version of the file GraphiXT exe that was available for download from www graphixt com up to the current version 1 21 4 4 Explanation of the version number format GraphixT AA BB F P Function file XX YY ZZ F Parameter editor XX YY VV P The first two numbers AA BB are the main components of the GraphiXT version number The numbers AA and BB only increase after improvements in the GraphiXT user interface addition of new features bug fixes or revising the documentation The other two components F and P indicate compatibility of the program GraphiXT exe with the function file and the parameter editor respectively Thus F and P can be called the program interface version numbers of the function file and the parameter editor respectively Those two numbers only change after a change in the rules of communication between GraphiXT exe and the other two programs In order to be able to load the function file and the parameter editor the number F must coincide with the fourth component of the function file version number and the number P must coincide with the fourth component of the parameter editor version number The first two components of the function file and parameter editor version numbers XX YY indicate the set of parameters and functions that define the simulation model Thus XX YY can be called the model version number The numbers XX
12. applied immediately and can not be undone whereas changes done to a list of parameters or DLL functions can be cancelled If the loaded plug in simulates a two layer system and layers No 0 and No 1 share the same set of coordinate x values then GraphiXT no longer uses x values belonging to layer No 0 i e the loaded plug in is no longer required to allocate the corresponding array In such a case the amount of memory that would be taken up by x values of layer No 0 is no longer taken into account when calculating the total amount of data which is shown in the dialog window Time limits and amount of data and it is assumed that any reference to an x value belonging to layer No 0 is equivalent to the reference to the corresponding x value of layer No 1 In order to decrease the time of drawing a large number of cells in array views only the visible cells are filled with data and in data tables only the cells of the visible rows are filled with data including the cells that belong to non visible columns As a result the data table command Fit table to contents has been replaced with the command Fit table to visible contents After selecting that command all column widths are adjusted to the width of data values in the visible rows However after vertical scrolling of the window some of the data in the newly uncovered cells may be clipped so that it may be necessary to select the Fit command again Note the F
13. at reference free curve data 2014 05 29 Fixed a bug that could cause a crash while calculating a built in integration summation iteration or root finding function whose first argument i e the processed expression contained two or more calls to the just mentioned built in functions Fixed a bug that sometimes caused the built in function Root or Root2 to fail when the processed expression contained calls to built in integration summation iteration or root finding functions 2014 06 02 Fixed a bug that sometimes caused a built in integration summation or iteration function to return an incorrect value when the first argument of the function 1 e the processed expression contained two or more calls to the just mentioned built in functions 2014 06 07 Fixed a bug that sometimes caused incorrect updating of the slider bar after selecting the menu command Window Update All Graphs 44 45 46 47 48 49 50 51 52 53 54 55 56 Dik 58 59 2014 07 29 Improved handling of exceptions in user defined DLL functions 2014 07 30 Inserted Section 4 5 Using DLL functions in programs into the GraphiXT user s manual 2014 08 01 Fixed a bug that prevented the program from detecting an incorrect argument type in a function call when that function was used as a formal parameter of a subroutine Fixed a bug that sometimes caused a runtime error after deleting a graph win
14. ate free curves has been added to the Graph options menu This command is used to create one or more free curves by specifying the range of their x and y values An option to show the current time edit control next to the time slider when the active window is a time graph window has been added Fixed a crash when attempting to delete a formula linked to model time or coordinate values when there are other formulas linked to independent X datasets in the same graph Several other minor bugs have been fixed several minor improvements of the user interface have been made The GraphiXT user s manual has been updated to reflect the recent changes in the program 1 19 4 4 2013 06 21 Most of the changes in comparison with version 1 15 are related to extending the computational programming capabilities of GraphiXT l A new menu Programming has been added which groups the menu commands providing access to programming objects i e formulas subroutines arrays parameters and DLL functions and to their properties Formula editor and the text editor the Info window have been re written on the basis of the code Crystal Edit by Andrei Stcherbatchenko All editing history of each program and of the text in the Info window is preserved even after closing the editor window so that all editing actions can be undone or redone when that text is opened again Several new built in functions have been added in
15. ation error which showed up while compiling an initialization expression of a parameter or an array when a subroutine editor window was active and the expression required an active graph window 2014 02 16 Fixed a crash that was possible after attempting to close the nonlinear fitting dialog window when any of the four text input boxes on the right hand side of the window current initial maximum and minimum values of the current parameter had input focus 2014 02 21 Fixed a crash after clicking the Curve format and name button in the model function list dialog when that list is empty 2014 03 01 The comment symbol may now be preceded by code on the same line as in C programs 2014 03 03 Fixed a crash during nonlinear fitting when model parameters are being optimized and a function data table is open 1 21 4 4 2014 03 10 l 10 11 Added a new menu command Tools Options and a corresponding toolbar button After selecting that command the property sheet window Project defaults is opened That window has eight tabs which are used to select property pages where various default properties can be modified e g default fonts The changes can be applied either to existing windows of the current project or to all future windows of the same project i e project defaults can be changed or to all future projects i e GraphiXT defaults can be changed The GraphiXT
16. ation when the right hand side of the assignment operator was a call to one of advanced built in functions has been fixed A bug that prevented formulas with syntax errors from being automatically re compiled and calculated after changing array name or number of indices has been fixed 2013 08 21 A built in function Return x has been added When it is called the current formula or subroutine is immediately terminated returning the value of x 2013 09 19 A bug that sometimes caused incorrect value of model data amount to be shown after changing the number of layers in the simulated system has been fixed 2013 09 20 When an initialization expression of a parameter or an array is longer than the maximum allowed length 100 characters a warning message appears Calculation of the standard error of the mean during elementary statistical analysis dialog window Data analysis has been corrected Now it is calculated by dividing the standard error of single observation by the square root of the total number of observations n in previous versions the standard error of single observation was divided by the square root of n 1 2013 09 21 A bug that sometimes caused incorrect error message after a runtime error has been fixed 2013 10 06 A bug that could cause a crash during simulation has been fixed That bug showed up when the simulated system consisted of a single layer and the primary f x t functions w
17. bjects which exist independently of user defined programs Array element values can be accessed and modified in user defined programs Array elements are referenced using the format a il 12 13 where a is the array name and il i2 13 are the array indices any expressions can be used instead of them 8 array data types are supported 64 or 32 bit floating point and 32 16 or 8 bit signed or unsigned integer However in all arithmetic operations the array element values are converted on the fly to 64 bit floating point format Array properties name dimensions and data type are defined in the Array dialog In addition that dialog allows initialization of the array elements using an entered expression That expression can include user defined identifiers of array indices and references to any programming object defined in the current project making possible complex initializations 8 10 11 12 13 14 Any user defined array can be allocated or deallocated at any time When an array is deallocated all its elements are lost but the array object is not deleted New arrays are not allocated by default If a user defined program contains a reference to an array that has not been allocated then execution of that program would cause a runtime error This is one of runtime errors handled by GraphiXT other runtime errors which are handled by GraphiXT are listed below Several built in ar
18. cify that abscissas of skipped points must be the same for all curves linked to a particular X set this is done using a corresponding checkbox of the curve format dialog window Properties of X sets can also be changed using a new menu command Graph options X datasets In the current version if a dialog window with a list of model functions or with their properties is open in GraphiXT then major modifications of model parameter values done in the parameter editor are not accepted until the user closes that dialog The GraphiXT user s manual has been updated to reflect the recent changes in the program 1 15 4 4 2012 09 08 l The current version of GraphiXT can display function data in table format Each data table is associated with a particular graph window and there is only one data table for each graph window Two table modes are possible in partial mode the table only shows the data corresponding to the points that are visible in the graph window this is the default mode and in complete mode all the data associated with the given graph window are shown in the table In a table window function values can be edited either directly by entering values into corresponding cells or by copying and pasting Switching between the table window and the corresponding graph window or between the two modes of the data table can be done using the corresponding menu commands or toolbar buttons A new command Cre
19. cluding the loc function which is used to pass addresses of variables arrays and functions to other functions also see below Support for user defined subroutines has been added The main difference between a subroutine and a formula is that a subroutine is only executed when called invoked programmatically from a formula or another subroutine whereas formulas can not be referenced programmatically in this respect a formula is analogous to the main function which exists in many programming languages Up to 20 arguments can be passed to each subroutine Each argument can be either an expression or an address of a variable or a pointer to an array or a pointer to another subroutine or built in function the number and meaning of each formal parameter of a subroutine are defined in the dialog window Subroutine name and formal parameters Recursion is allowed In order to avoid stack overflow the subroutine call depth nesting level is limited to 300 Each subroutine can have up to 20 local parameters which are similar to local parameters of formulas the local parameters are visible only in the corresponding subroutine Unlike local parameters of formulas local parameters of subroutines can not be optimized by nonlinear fitting The while loop operator has been added Support for multi dimensional arrays has been added Arrays can have up to 20 dimensions indices Arrays in GraphiXT are global o
20. ding elements in row 2 of a two dimensional array A and in column 3 of a two dimensional array B is calculated as follows result Sum A 2 t B t 3 t 1 Size loc A 1 1 Argument No of all built in integration summation and iteration functions defines the expression to be processed and argument No 2 defines the integration variable or index of summation or index of iteration The expression defined by argument No stays in scope of the calling program so that all previously defined variables can be used in it The integration variable or index of summation takes priority over all other variables including system variables and it is only visible in the processed expression so that any identifier can be used in place of that variable In the previous example the value of the system variable t the time value is not affected by the summation Detailed descriptions of all built in integration summation and iteration functions are given in the updated user s manual 10 11 12 13 14 15 16 17 Calculation of sequences of values for example when plotting a formula or initializing an array or during nonlinear fitting has been made faster by reducing the overhead associated with calculating each value All limitations on using the unary minus or unary plus in user programs have been removed It is now treated according to the generally accepted rules The maximum allowed subroutine cal
21. dow if a formula code editor window was open 2014 08 05 Fixed a bug that caused the failure to detect an unloadable DLL function during compilation of a user defined program when that DLL function was used as an argument of the built in function loc 2014 08 25 Fixed a bug that caused a crash when calling the built in function Size2 with the first argument equal to loc FC loc FA or loc FX and the second argument equal to 3 if the same call with the second argument equal to 1 or 2 would return 0 2014 08 27 Fixed two bugs that could cause a crash or incorrect reported value of model data amount during nonlinear fitting when some of varied parameters were model parameters and the time of a single simulation run was extremely short so that there were several iterations per second 2015 01 18 Fixed a crash after deleting a row corresponding to a varied parameter from the grid control with the list of parameters in the dialog window Nonlinear least squares fitting and then starting the fitting process 2015 01 23 Fixed incorrect redrawing of graph windows excluding the current graph window when margins were changed in the axis properties dialog and option Apply to all existing graphs was selected 2015 01 26 Changed the default error factor i e the square root of the weight factor of squared errors when calculating the sum of squared errors during nonlinear least squares fitting it
22. ects as well as for defining the set of X values of an edited formula a modeless dialog window Program editor tools has been added It can be hidden or displayed whenever a program editor window is active In order to display the programming tools dialog the user has to select the menu command Programming Show programming tools dialog or the corresponding command of the context menu of the program editor All programming objects i e formulas subroutines arrays parameters and DLL functions can now be copied and pasted between different projects Excluding formulas this is done in the dialog window with the list of objects of that type using the corresponding buttons or commands of the context menu or keyboard shortcuts Ctrl C Ctrl V Ctrl X formulas can be copied and pasted in graph windows as in previous versions of GraphiXT A list of subroutines arrays parameters or DLL functions can be rearranged by cutting any object and pasting it into a different 4 15 16 17 18 position in the same list In addition lists of subroutines and arrays have the Up and Down arrow buttons which provide a more convenient way to rearrange the list the keyboard shortcuts are Ctrl T and Ctrl 4 respectively Another difference between lists of subroutines or arrays and lists of parameters or DLL functions is that any change to a list of subroutines or arrays is
23. ed a crash after pasting data into a function data table which is in partial mode 2015 09 14 Fixed a bug that caused a failure to redraw automatically array view windows after initializing an array whose initialization expression contains a call to a subroutine which modifies array data
24. ere computed with maximum precision i e after checking the checkbox Primary functions in the dialog window Time limits and amount of data A bug that sometimes caused incorrect X axis limits after rescale has been fixed That bug showed up when the graph did not have any model functions but had formulas whose X datasets coincided with model times values or with model layer node coordinates 2013 10 27 A bug that could cause a crash when working with an array view containing a large number of rows or columns several tens of millions and having a large row height or large column width has been fixed This fix involves limiting the row height or column width so that the total virtual height and width of the table does not exceed 2 10 pixels 2013 11 06 After opening a project file that was saved at a different screen resolution positions of graphical objects text labels legend and free form lines in the graph windows are closer to the original positions 2013 12 02 A bug that could cause a crash after creating a new subroutine or DLL function when some of the formulas contain references to arrays has been fixed 2013 12 07 Runtime errors after changing the number of curves when there is a data table which is in partial mode and invisible e g minimized or obscured by a maximized graph window have been fixed 33 34 35 36 37 38 39 40 41 42 43 44 45
25. ion it is no longer required to check at least one of the two checkboxes Connect points and Show points as symbols in the curve format dialog window If neither checkbox is checked then the corresponding curve becomes hidden i e it is not plotted in the graph window its name is not shown in the legend and its data are not taken into account when rescaling the axes However it is still possible to analyze the data of hidden curves e g to use them for nonlinear fitting smoothing etc or to use them in formulas If a curve is hidden then its options can only be accessed by opening the corresponding list of curves menu commands Graph options Free curves Graph options Select Simulation options Formulas A new menu command Graph options Free curves has been added By selecting that command a dialog window with a list of all free curves including the hidden ones is opened In that list it is possible to edit options of any free curve Two commands Copy formula and Cut formula have been added to the formula context menu The difference of those commands from the commands Copy curve and Cut curve is that the formula text and the values of local parameters are copied to the clipboard instead of the point coordinates Accordingly a command Paste formula has been added to the graph context menu The option Independent set of argument values
26. it command is absent in array views In the array view all non fixed columns are forced to be of equal width a change of one column width causes a corresponding change of the widths of all other columns and likewise for heights of non fixed rows A number of bugs have been fixed The GraphiXT user s manual has been updated to reflect the recent changes in the program 1 20 4 4 2013 08 10 l Nine built in integration summation and iteration functions have been added The built in function Int is used to calculate integrals of user defined functions over finite intervals For example the integral of the function exp x exp t x with respect to x from 1 to 10 is calculated as follows result Int exp x x exp t x 2 x 1 10 In the next example the double integral of a user defined function FUNC 1 a b is calculated result Int Iint FUNC1 a b a al a2 b b1 b2 The built in function Inti is used to calculate integrals of functions over infinite intervals Example of integration from 5 to co result Inti exp x x exp t x 2 x 5 1 when integrating from o to a finite bound the last argument should be 1 Example of integration from 00 to too result Inti exp x x exp t x 2 x 0 2 in this case argument No 4 must be 2 and argument No 3 can be any value The built in function Sum is used for summation For example the sum of products of correspon
27. l depth nesting level has been increased from 300 to 1000 If an expression of a global or local parameter has syntax errors then after attempting to calculate that parameter it is assigned the indeterminate value 1 4 IND in previous versions the parameter value remained unchanged Image of a graph is now copied to clipboard not only in bitmap format but in Windows metafile format too Several bugs have been fixed The GraphiXT user s manual has been updated to reflect the recent changes in the program 2013 08 13 Memory exception handling when allocating arrays or changing array view settings has been added Runtime errors when attempting to copy a very large amount of data to clipboard have been fixed 2013 08 14 The meaning of the system variable NLSF during nonlinear fitting has been changed if the fitted dataset belongs to a free curve then NLSF is equal to the sequence number of that curve in the corresponding graph window and if the fitted dataset belongs to a model function then NLSF is opposite to the sequence number of that model function In addition six new system variables have been defined for identifying the current data point during nonlinear fitting see the updated user s manual for details A crash after an attempt to open the smoothing dialog when a formula is selected has been fixed 2013 08 15 Three system variables for use with built in integration functions have been added
28. of the formula dialog window has been made more flexible if that checkbox is checked after checking any one of the other two checkboxes X axis range or an existing dataset then after clicking OK or Apply the point abscissas corresponding to the previous option will be used i e they will not be recalculated using the entered limits and the number of points The abscissas are only recalculated after changing a limit value or the number of points The build dates of the program GraphiXT and the loaded simulator plug in are shown in the dialog window About GraphiXT Several minor bugs have been fixed many minor improvements of the user interface have been made 1 11 4 4 2012 07 29 l Sets of abscissa values of free curves and formulas the X sets are now treated as a separate category of datasets in the previous versions each set of abscissas was treated as a part of a particular free curve or formula data Any number of free curves or formulas can be linked to an X set When an abscissa of a point is changed the corresponding abscissas of all other curves linked to the same X set are changed too When two or more free curves are pasted or imported from a text file they are initially linked to the same X set Linked curves can be unlinked using the checkboxes Unlink this curve or Unlink all curves that have been added to the curve format dialog window In addition it is now possible to spe
29. presence or absence of the status bar only in code editor When a text editor window is active then the font size can also be changed by scrolling the mouse wheel and at the same time keeping the Ctrl key down The default properties of the code editor can be set using the previously mentioned menu command Tools Options tab Code editor 12 13 14 15 16 17 18 19 20 21 22 23 24 293 26 2h 28 In the dialog windows with lists of free curves and formulas multiple items can be selected and there are three buttons that perform actions on all selected items at once Hide Show and Delete All dialog windows that contain lists are now resizable The positions of those lists and other controls in the dialog window depend on its dimensions The dialog windows with multiple lists are split into vertical or horizontal panes separated by pane handles which can be dragged with the mouse so that widths or heights of two adjacent lists are changed simultaneously one is increased while the other is decreased The original dimensions of each resizable dialog window and original positions of the mentioned pane handles can be restored by selecting the corresponding command of the system menu the system menu is opened either by right clicking the title bar of the dialog window or by left clicking the window icon which is in the top left corner
30. rays have been defined which allow access to any model data value in user defined programs and not just to interpolated model function values corresponding to the current time and current coordinate as in previous versions of GraphiXT Similarly any data point of any free curve can be accessed All built in arrays are read only i e user programs can not modify their elements those arrays are automatically modified by GraphiXT when the user changes the model data or free curve data The array viewer has been added It is based on the same code as function data tables The array viewer allows direct access and modification of element values of user defined arrays In the case of a multidimensional array any two indices can be chosen to be variable those two indices are used to number the rows and columns of the array view The position range of values of each index the maximum number of cells that can be shown in an array view and other options of the array viewer are set in the dialog window Array view options The code of the function data tables and the array view has been modified so as to decrease the amount of data associated with each cell of the table As a result the total amount of memory required by each function data table or array view has been decreased to less than 1 5 of the previous amount Since an extension of programming capabilities involves an increase of the number of possible programming errors a lot of
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