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Function File: map = rainbow ()

Function File: 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 as an image
 image (1:64, linspace (0, 1, 64), repmat ((1:64)', 1, 64));
 axis ([1, 64, 0, 1], "ticy", "xy");
 colormap (rainbow (64));

Produces the following figure

Figure 1

Package: octave