How to vary colourmap while using surf function

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Ricky 2013-8-15

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关闭： MATLAB Answer Bot 2021-8-20

Hello Everyone,

I am using surf command to plot a 2 dimensional function Z. The dimensions of Z are 155*125. The minimum value of Z is 162 and maximum value is 2048. I want to define my colour bar such that

values greater than 1301 -> colour black

values between 801 - 1300 -> colour red

values between 501 - 800 -> colour blue

values between 200 - 500 -> colour yellow

values less than 200 -> colour dark red

In the documentation i was able to find the RGB colours corresponding to my requirements, but I do not know how to generate a colourmap using the RGB values which fits my above mentioned criteria.

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Answer 1

Walter Roberson 2013-8-15

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Let darkred yellow and so on be rgb row vectors with the appropriate content. Then

cmap = vertcat( repmat(darkred, 200-162, 1), repmat(yellow, 500-200, 1), repmat(blue, 800-500, 1), repmat(red, 1300-800, 1), repmat(black, 2048-1300, 1));
colormap(cmap);