How to make one contour transparent in contourf?
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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
采纳的回答
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.
3 个评论
Walter Roberson
2013-1-28
Due to round-off error, it is best not do do exact comparisons of floating point values.
patchesToHide = abs(patchValues - valueToHide) < 100*eps(valueToHide);
Arnault
2013-1-28
更多回答（2 个）
Will Grant
2021-8-31
编辑：Will Grant
2021-8-31
1 个投票
Leslie
2015-2-3
0 个投票
This solution has stopped working in 2014b. Does anyone know if we still change the tranparency of 2D contour plots? If so how? Thanks
1 个评论
Boris Belousov
2016-2-25
编辑：Boris Belousov
2016-2-25
Unfortunately you have to manually define a contour of the area you want to make transparent. See how to make contour plots transparent.
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