|The PLplot Plotting Library: Programmer's Reference Manual|
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Device-independent routine for setting up the viewport. This defines
the viewport in terms of normalized subpage coordinates which run
from 0.0 to 1.0 (left to right and bottom to top) along each edge of
the current subpage. Use the alternate routine
plsvpa in order to
create a viewport of a definite size.
plvpor(xmin, xmax, ymin, ymax)
This function is used in examples 2,6-8,10,11,15,16,18,21,23,24,26,27,31.