How to make one contour transparent in contourf?

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Arnault
Arnault 2013-1-28
编辑： Will Grant 2021-8-31
Hello, I have a contour plot with several layers define as follows:
[c,h]=contourf(X,Y,Z,[value1 value2 value3 value4]);
I would like to make a selected contour transparent, let's say the first contour defined by value1. Any thought on how to proceed? Thanks.
Arnault

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José-Luis
José-Luis 2013-1-28
[C,h] = contourf(peaks(20),-4:1:4);
allH = allchild(h);
valueToHide = 1;
patchValues = cell2mat(get(allH,'UserData'));
patchesToHide = patchValues == valueToHide;
set(allH(patchesToHide),'FaceColor','k','FaceAlpha',0.8);
Note that you could set the FaceColor to white if that is what you mean by transparent. Otherwise you could set the FaceAlpha to zero for the patch to be transparent.
Please accept an answer if it helps you.
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Arnault
Arnault 2013-1-28
编辑：Arnault 2013-1-28
I have a related question. The colorbar keeps the original color. Any idea on how I could do the same on the colorbar?

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Will Grant
Will Grant 2021-8-31
编辑：Will Grant 2021-8-31
See my answer here - working for R2020a
Leslie
Leslie 2015-2-3
This solution has stopped working in 2014b. Does anyone know if we still change the tranparency of 2D contour plots? If so how? Thanks

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