Graphic option
key
Default value: ""
(empty string)
key
is the name of a function in the legend. If key
is an
empty string, no key is assigned to the function.
This option affects the following graphic objects:
gr2d
: points
, polygon
, rectangle
,
ellipse
, vector
, explicit
, implicit
,
parametric
, and polar
.
gr3d
: points
, explicit
, parametric
,
and parametric_surface
.
Example: