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.