Colormap of prism colors.
PRISM(M) returns an M-by-3 matrix containing repeated use
of six colors: red, orange, yellow, green, blue, violet.
The default value of M is the length of the current colormap.
PRISM, with no input or output arguments, changes the colors
of any line objects in the current axes to the prism colors.
This is particularly useful with a CONTOUR plot, eg.
The colors in the PRISM map are also present, in the same order,
in the HSV map. However, PRISM uses repeated copies of its six
colors, whereas HSV varies its colors smoothly.
See also HSV , FLAG , HOT , COOL , COLORMAP , RGBPLOT , CONTOUR .