How can I specify different colors for different groups of data in correlation heatmap?

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Rosalba Gaudiuso 2020-5-15

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https://ww2.mathworks.cn/matlabcentral/answers/525716-how-can-i-specify-different-colors-for-different-groups-of-data-in-correlation-heatmap

评论： Rosalba Gaudiuso 2020-6-4

Hello,

I have a correlation heatmap and I would like all the "boxes" with -0.7<R<0.7 to be the same color (e.g. gray), so to be able to more easily visualize the others.

To do this for only one range (e.g. R<0.7), I used caxis, but it does not allow to specify multiple ranges.

This looks like it would be an easy fix, but I am pretty new to Matlab and I don't seem to be able to figure out anything.

Thanks for your input!

Rosalba

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Rosalba Gaudiuso 2020-5-15

Hi,

Thanks for your answer.

I ended up setting all the -0.7<R<0.7 values = 0 with a relational operator and then just plotting the heatmap as such.

Definitely not the most elegant solution, but for a total beginner it kinda works. :)

darova 2020-5-15

ok

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Answer 1

Devineni Aslesha 2020-5-18

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Hi Rosalba,

Here is the way to map the boxes with range -0.7<R<0.7 to the same colour.

load patients
tbl = table(LastName,Age,Gender,SelfAssessedHealthStatus,...
    Smoker,Weight,Location);
h = heatmap(tbl,'Smoker','SelfAssessedHealthStatus','ColorVariable','Age','ColorMethod','median');
xh = h.Colormap > -0.7 & h.Colormap < 0.7;
[rowIdx, colIdx] = find(xh == 1);
h.Colormap(rowIdx, colIdx) = 0.5;