The PLplot Plotting Library: Programmer's Reference Manual
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plgxax: Get x axis parameters

plgxax (digmax, digits);

Returns current values of the digmax and digits flags for the x axis. digits is updated after the plot is drawn, so this routine should only be called after the call to plbox (or plbox3) is complete. See the Section called Annotating the Viewport in Chapter 3 for more information.

digmax (PLINT *, output)

Pointer to variable with the maximum number of digits for the x axis. If nonzero, the printed label has been switched to a floating point representation when the number of digits exceeds digmax.

digits (PLINT *, output)

Pointer to variable with the actual number of digits for the numeric labels (x axis) from the last plot.

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plgver: Get the current library version numberUpplgyax: Get y axis parameters