Trying to Customize a heatmap color bar and thresholds

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Hi,
I'm trying to create a heatmap but I only want to it to show color if the value is either above 10 or below -10. Otherwise it will just be white if it's within this 'dead zone'.
Additionally I'd like to have different colors for values above 10 and yet another color for values below -10.
Is there a way to customize the colormap for something like this?
Thanks

Accepted Answer

Kevin Holly
Kevin Holly on 7 Sep 2022
Edited: Kevin Holly on 7 Sep 2022
m=30*rand(30)-15;
surf(m,'FaceColor','interp')
cmap = [1 0 0; 1 1 1;1 1 1; 1 1 1; 1 1 1; 0 0 1];
colorbar
caxis([-15 15])
colormap(cmap);
figure
imagesc(m)
c=colorbar;
c.Limits = [-15 15];
colormap(cmap);

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