How to create a personalized colormap?

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Luca 2012-11-27

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https://ww2.mathworks.cn/matlabcentral/answers/54997-how-to-create-a-personalized-colormap

I would like to create a colormap function which takes in a value from say 0 to 100 and return a color, which I can then use in plot/patch functions. I'd need the color to go from white to e.g. red, but if you can provide a general example it's even better.

Thanks for any tip!

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Image Analyst 2012-11-28

编辑：Image Analyst 2012-11-28

在 MATLAB Online 中打开

How about

myColormap = flipud(hot(100))

indexes start at 1. If you need to start at 0 just add one before you get the actual index.

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Answer 1

Matt Fig 2012-11-27

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https://ww2.mathworks.cn/matlabcentral/answers/54997-how-to-create-a-personalized-colormap#answer_66739

编辑：Matt Fig 2012-11-27

在 MATLAB Online 中打开

You can easily do it. Make the surface go from white to red as you say...

peaks(100);
set(findobj('type','surf'),'edgecolor','none')
CM = [ones(1,100);linspace(0,1);linspace(0,1)].';
set(gcf,'colormap',CM)
% Or, set(gcf,'colormap',flipud(CM))

So to use a colormap you just need an m-by-3 matrix. Each row is a color that will be indexed into by surfaces, etc. To find out more, look at the documentation for colormap.