generate 3-D plot object for a sphere
sphere(c, r, options)
(optional) list(realcons); center of the sphere
(optional) realcons; radius of the sphere
(optional) equations of the form option=value as described in the plot3d/options help page
The sphere command creates a three-dimensional plot data object, which when displayed is a sphere centered at c and of radius r. The default values for c and r are 0,0,0 and 1, respectively.
A call to sphere produces a plot data object, which can be used in a PLOT3D data structure, or displayed using the plots[display] command.
Remaining arguments are interpreted as options, which are specified as equations of the form option = value. For more information, see plottools and plot3d/options.
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