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C++ API

: map = rainbow ()
: map = rainbow (n)

Create color colormap. This colormap ranges from red through orange, yellow, green, blue, to violet.

The argument n must be a scalar. If unspecified, the length of the current colormap, or 64, is used.

See also: colormap.

Demonstration 1

The following code

 ## Show the 'rainbow' colormap profile and as an image
 cmap = rainbow (256);
 subplot (2, 1, 1);
  rgbplot (cmap, "composite");
 subplot (2, 1, 2);
  rgbplot (cmap);

Produces the following figure

Figure 1

Package: octave