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How to create a colormap attributing specific colour to each element?

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Cassio Lima
Cassio Lima on 26 Jan 2019
Commented: Cassio Lima on 28 Jan 2019
Hi everyone!
I have an array A,
A = [ 1 2 3 4
2 2 3 1
1 1 4 2];
I want to create a colormap but each element needs to be colored in a specific colour, for example, 1 is blue, 2 is black, 3 is green and 4 is yellow.
Thanks

Accepted Answer

Matt Gaidica
Matt Gaidica on 26 Jan 2019
Given these data, I would do this.
A = [ 1 2 3 4
2 2 3 1
1 1 4 2];
cmap = jet(max(A(:)));
figure;
imagesc(A);
colormap(cmap);
colorbar;
colormap.png

More Answers (1)

Stephen Cobeldick
Stephen Cobeldick on 27 Jan 2019
Edited: Stephen Cobeldick on 27 Jan 2019
A = [1,2,3,4;2,2,3,1;1,1,4,2];
map = [0,0,1;0,0,0;0,1,0;1,1,0]; % [blue;black;green;yellow]
imagesc(A,[1,4]) % better to set the color limits.
colormap(map)

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