Heatmap - how to get the plotted colors

Question

Nils Liebe 2021-9-3

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1446169-heatmap-how-to-get-the-plotted-colors

评论： Nils Liebe 2021-9-5

Dear all,

I would like to get the rgb-color code of a data set i am plotting in a heatmap. Does anyone know where they are stored or how to extract them?

%Exp. 
Data=[0.216745778875956
0122005059399983
0162673412533310
00149830774701733
263389055948955
342338724357287
0955767041221151
119981642250681
0606266369191968
759691756727176
514382973045806
668104140446562
720311719592812
671178482390491
278785037951106
476509405546337
409639773389851
582438199698988
567789956119946
281777114781149
674368366676059
188936792339474
746659486291274
827451886871509
708089195819381
345204905187858
492727562626227
453467008650955];
fig=heatmap(Data,'Colormap',jet);

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Answer 1

J Chen 2021-9-3

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链接

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https://ww2.mathworks.cn/matlabcentral/answers/1446169-heatmap-how-to-get-the-plotted-colors#answer_780314

camp = colormap

https://www.mathworks.com/help/matlab/ref/colormap.html

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Nils Liebe 2021-9-5

编辑：Nils Liebe 2021-9-5

Thanks for your answer.

I already tried colormap(); The problem is that you get all 256 values auf the jet-colormap. I only want the rgb-values of my 28 data points (or the position within the colormap). :(

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Answer 2

darova 2021-9-5

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链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1446169-heatmap-how-to-get-the-plotted-colors#answer_781119

在 MATLAB Online 中打开

Just scale values

%Exp. 
Data=[0.216745778875956
0.0122005059399983
0.0162673412533310
0.00149830774701733
0.263389055948955
0.342338724357287
0.0955767041221151
0.119981642250681
0.0606266369191968
0.759691756727176
0.514382973045806
0.668104140446562
0.720311719592812
0.671178482390491
0.278785037951106
0.476509405546337
0.409639773389851
0.582438199698988
0.567789956119946
0.281777114781149
0.674368366676059
0.188936792339474
0.746659486291274
0.827451886871509
0.708089195819381
0.345204905187858
0.492727562626227
0.453467008650955];
n = 100;                   % number of colors
ind = round(Data*n)+1;     % indices of colors (scale)
cm = jet(n);               % create colormap
cm(ind,:)                  % show colors RGB
ans = 28×3
         0    0.4000    1.0000
         0         0    0.5600
         0         0    0.6000
         0         0    0.5200
         0    0.5600    1.0000
         0    0.8800    1.0000
         0         0    0.9200
         0         0    1.0000
         0         0    0.7600
    1.0000    0.4400         0