graphon; to open a graphics window, graphons; to
open a small graphics window, graphclr; to clear a graphics
window already opened, graphno; to leave the graphics window
open and switch output to the text window, graphwait; to
pause between graphs, and graphoff; to wait for a key to be
pressed in the text window and then to close the graphics window.
(Use wincloseall; to close the graphics window without a
pause.)
