PLOTSCALEMIN and PLOTSCALEMAX
The PlotScaleMin and PlotScaleMax functions return the rminimum and maximum value of the specified axis. The format is
PlotScaleMin(PlotName$,Axis$)
PlotScaleMax(PlotName$,Axis$)
PlotName$ is the name of the plot that is displayed on the tab at the top of the plot window. This parameter can be a string constant within single quotes or a predefined string variable.
Axis$ indicates which axis the value refers to. Axis$ can be 'X', 'X1', 'X2', 'Y', 'Y1', or 'Y2'. The 2 refers to the 2nd axis if present. For example, Y2 refers to the axis on the right of the plot. This parameter can be a string constant within single quotes or a predefined string variable.
Example:
{This example will use a macro to display a P-h plot determine the minimum and max pressures}
$UnitSystem SI K
$RunMacroAfter
DeletePlot 1
F$='Acetone'
PropPlot F$ PH 6 310 340 380 420 460 510 0 DoQLines
$endMacro
P$=plottabname$(0)
PMin=plotscalemin(P$, 'Y')
PMax=plotscalemax(P$, 'Y')