Trying to Customize a heatmap color bar and thresholds

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

Answer 1

[Kevin Holly]

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);

[blue_Steel]

Excellent, that'll do the trick.

Thanks!