How to make 2D rainbow ?

How to make a 2D rainbow plot like

https://en.wikipedia.org/wiki/Visible_spectrum#/media/File:Spectrum.svg https://en.wikipedia.org/wiki/Visible_spectrum#/media/File:Spectrum.svg

This will make 1D line.

x=1:10; y = [2 2 2 2 2 2 2 2 2 2];length = size(x, 2);
d = length:-1:1;
p = patch([x ],[y ], [d ], 'EdgeColor', 'interp'); 
axis off

How to add the second dimension?

[Rik]

Have a look at the doc for patch. If your code works (which depends on the colormap), it will most likely work for the FaceColor property.

Answer 1

[KSSV]

x=1:10; y = [2 2 2 2 2 2 2 2 2 2];length = size(x, 2);
d = length:-1:1;
p = patch([x ],[y ], [d ], 'EdgeColor', 'interp','Linewidth',20);