Last Used System Variables
Last-Used-System-vars
System VariableSystem Variable, Last UsedLast Used System VariableOrigin 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=;
|