Create a specific colormap for a contour plot

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Cb 2021-10-18

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https://ww2.mathworks.cn/matlabcentral/answers/1566366-create-a-specific-colormap-for-a-contour-plot

评论： Kevin Holly 2021-10-19

Hi I am trying to create a contour plot with my own colormap. However, this only works up to a certain value, after which the colours are no longer output as I had hoped. From 36.8 on, everything is output in the same colour. Does anyone know why this happens?

Levels = [3200 3366 3566 3680 3700 3800]
num_points = diff(Levels); 
colors = [ 0.24 0.36 0.56;
            0.25 0.56 0.55;
       0.45  0.82  0.26;
       0.82  0.8  0.19;
       0.81  0.61  0.24;
      ];
map = [];
for i=1:numel(num_points)
    map = [map; repmat(colors(i,:), num_points(i), 1)];
end
figure( 'Name', 'untitled fit 1' , 'Colormap', map);
h = plot( fitresult, [xData, yData], zData, 'Style', 'Contour' );
set(h,'LevelList',[23.4 33.6 35.6 36.8 37.0 40] , 'ShowText', 'on')

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Answer 1

Kevin Holly 2021-10-18

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https://ww2.mathworks.cn/matlabcentral/answers/1566366-create-a-specific-colormap-for-a-contour-plot#answer_810996

Type "colorbar" in the command window to view the colorbar. You can then see the limits of the colormap. You can change the limits with caxis.

Alternatively, you can Select Edit>Colormap... under the Figure menu and set the colormap limits with the Colormap Editor.

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Cb 2021-10-18

Hi Kevin, thanks for replying!

The caxis version doesn't seem to work.. And you seem to be using a different version of Matlab because I can see the colormap editor but it looks very different and I can't change the size and colorspace.

Do you maybe have another idea?

Kevin Holly 2021-10-19