|The PLplot Plotting Library: Programmer's Reference Manual|
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Sets the current orientation. If
ori is equal to zero
(default) then landscape is used (x axis is parallel to the longest
edge of the page), otherwise portrait is used. This option is not
supported by all output drivers (in particular, most interactive
screen drivers ignore the orientation). This routine, if used, must
be called before initializing PLplot.
This function is used in example 3.