MATLAB: How to create a colormap attributing specific colour to each element

Question

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

Answer 1

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;