Create a surface plot with colors associated to value on cell
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I have a matrix with 3 possible values: 1, 0 and -1. They may contain any combination of those elements. I'd like to choose the colors for each value (like blue for 1, gray for 0 and red for -1).
When I try surface(matrix), it's not possible to differ: surface(ones(X)) surface(zeros(X)) surface(-ones(X))
Any idea on how to get on with it?
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Dr. Seis
le 6 Oct 2011
Check out "colormap" in the Matlab Help Navigator. Right under the "Description" section, they talk about creating your own color map. You would define your color map such that the RGB values result in the desired colors to be applied to your surface plot.
Use colormap if you want to choose your own colors...
a=[1 1 -1;0 0 1;-1 -1 1;-1 -1 1];
cmap = [1,0,0;0.5,0.5,0.5;0,0,1]; % 1st row = red; 2nd = gray; 3rd = blue
imagesc(a);
colormap(cmap);
4 commentaires
Dr. Seis
le 14 Oct 2011
Does "grid on" work? If so, you may have to play with the settings for "grid"
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Fangjun Jiang
le 6 Oct 2011
use pcolor()
Two notes. The last row and last column is not shown so you might want to pad NaNs. Second, pay attention to the image shown. The color on grid (x,y) corresponds to the value in a(x,y). Don't try to map the color with the position of matrix shown in the Command Window. For example:
a=[1 1 -1;0 0 1;-1 -1 1;-1 -1 1];
b=a;
b(end+1,:)=nan;
b(:,end+1)=nan;
pcolor(b);
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Fangjun Jiang
le 11 Oct 2011
I am not sure what's wrong with your code. But when I run the following, it is exactly as expected. The top 2 rows are red, the bottom one row is gray.
%%
cmap = [1,0,0;0.5,0.5,0.5;0,0,1]; % 1st row = red; 2nd = gray; 3rd = blue
%I have this matrix
A = [-1 -1 -1
-1 -1 -1
0 0 0];
a=A;a(end+1,:)=nan;a(:,end+1)=nan;
pcolor(a)
colormap(cmap);
axis ij; %<--- Flips the image to make it look like the matrix
caxis([-1 1]); %<--- Makes the colors and values match
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