3.9.4 Last Used System Variables
Origin helps you keep track of the last used value of many objects in the project---such as the last LabTalk command issued, the last X-Function called, or the last Worksheet referenced---by automatically storing their values in string variables, and updating them appropriately as actions are carried out within the project.
To distinguish these variables from other types of string variables, a double-underscore is added to the beginning of the variable name (i.e., __REPORT$). Issue the list vs command to see those active in your current project.
Like all string variables, their names should be followed by a dollar-sign, $, when accessing them. As system variables, you should not attempt to assign a value to them (that is, treat them as READ ONLY).
The following table lists the most common variable names of this automatically-generated variety, their content type, an example of use, and a brief description of their content. Keep in mind that these variables hold most recent values and are, therefore, constantly updated.
| Name | Content | Example | Description |
|---|---|---|---|
| __FINDDEP$ | Worksheet Name | [Sample]FindYfromX! | Most recent Find Y from X table |
| __FINDINDEP$ | Worksheet Name | [Sample]FindXfromY! | Most recent Find X from Y table |
| __FITCURVE$ | Worksheet Name | [Sample]FitNLCurve! | Most recent fitted data |
| __HEADER$ | String | "ExponentialBaseline.dat" | Last ASCII import file header string |
| __LASTLTCMD$
(8.51 SR1) |
Command | %A=%A of %W %N | Last LabTalk command issued |
| __LASTMATRIX$ | MatrixBook name | MBook1 | Last active matrixbook |
| __LASTOGS$ | OGS file name | D:\User Files Folder\Custom.ogs | Last executed OGS file |
| __LASTWKS$ | Workbook name | Book1 | Last workbook referenced |
| __NLDATA$ | Column or dataset name | [Book1]Sheet1!2 | Non-Linear Fitter input data range |
| __PAINTEGPEAK$ | Worksheet name | [Book2]Integration_Result1! | Peak Analyzer's peak-integration sheet |
| __PAINTEGCURVE$ | Worksheet name | [Book2]Integrated_Curve_Data1! | Peak Analyzer's integrated curve data sheet |
| __PABASELINE$ | Worksheet name | [Book1]Sheet1! | Peak Analyzer's baseline data sheet |
| __PASUBTRACTED$ | Worksheet name | [Book1]Sheet2! | Peak Analyzer's subtracted curve data sheet |
| __PAPEAKCENTER$ | Worksheet name | [Book1]Sheet3! | Peak Analyzer's peak-center data sheet |
| __PEAK$ | Worksheet Name | [Sample]PeakProperties! | Most recent peak properties data |
| __REPORT$ | Worksheet Name | [Sample]FitNL! | Last report sheet generated |
| __RESIDUAL$ | Worksheet Name | [Sample]FitNLCurve! | Most recent residuals from fitting |
| __SUBHEADER$ | String | "Channel Amplitude" | Last ASCII import file subheader string |
| __XF$ | X-Function Name | impASC | Last X-Function called |
These strings are useful for further analysis. For example, the following script assigns the location of the most recently generated fit curve to a range variable, which is then integrated to find the area under the fit curve:
// Access Column 2 of the Worksheet storing the fit data range rd = %(__FITCURVE$)2; // Integrate under the fit curve integ rd; // Display the area under the curve integ.area=;