set vpage xmin xmax ymin ymax
This command defines a "virtual page" that fits within the specified
limits of the real page. All graphics output will be drawn into this
"virtual page" until another set vpage command is entered. A
clear command clears the physical page (and any virtual pages
drawn on it).
When GrADS is first started, it prompts for landscape or portrait mode. This defines the size of the real page (11x8.5 or 8.5x11), and the dimensions for the virtual page must fit within this real page.
The set vpage command will define virtual page limits in
terms of inches (virtual page inches), which are the coordinates that will
be used in the various commands that require inches to be used. The new
page limits are printed when the set vpage command completes.
To return to the default state where the real page equals the virtual page, enter:
set vpage off