zlabel — setting Z axis labels
zlabel sets the label used on the Z axis of the current
sub-plot. If this optional string argument is missing, or is
a null length string, the label for the Z axis is missing.
This routine must be called before doing the plot you want it to
appear on.
This label is ignored if the current plot has only two dimensions.
This is not an built-in function. This function
is normally loaded on start-up from the plot.r file in the
standard rlib directory. Use of the -r option, incorrectly
setting the RLAB_LIB_DIR environmental variable, or modifying
plot.r may make this function unavailable.
Subsections