9.6. - ze erase old plot
clears from the graphics filter any plot, or parts of a plot, that have been drawn using the commands that begin with
z. If the
graphics filter is associated with a video screen, the screen will
be erased.
zeIf you have already drawn a filter plot or any of its elements using
z, zz, zp, za or related commands (see Chapter
7), you can use
ze to clear the memory of the old plot elements
and begin fresh with a new plot.
Although
z and
zz will
automatically clear away old plot material before drawing a fresh
plot, the other filter commands simply overwrite the existing material.