The PLplot Plotting Library: Programmer's Reference Manual
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plsxax: Set x axis parameters

plsxax (digmax, digits);

Returns current values of the digmax and digits flags for the x axis. digits is updated after the plot is drawn, so 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, input)

Variable to set the maximum number of digits. If nonzero, the printed label will be switched to a floating point representation when the number of digits exceeds digmax.

digits (PLINT, input)

Field digits value. Currently, changing its value here has no effect since it is set only by plbox or plbox3. However, the user may obtain its value after a call to plbox by calling plgxax.

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plsvpa: Specify viewport in absolute coordinatesUpplsyax: Set y axis parameters