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Black mask over pcolor plot

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Nikolay Vinnichenko
回答： J. Alex Lee 2019-12-3
I have two matrices of the same size. The first one is function of two variables, which is to be displayed using pcolor. But then I need to mask (paint with black) part of this plot using the mask defined by the second matrix (zeros for transparent cells, ones for those to be masked). I need the colorbar and caxis to remain from the main pcolor of the function. How can I do this? I suspect this is something to do with AlphaData property of the second graph, but so far I only see the solutions for imshow, but not for pcolor.

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J. Alex Lee
J. Alex Lee 2019-12-3
You can assign NaN in your first matrix according to your mask and set the background of your axes to black:
A = randi(255,200,200);
B = false(200,200);
B(20:30,60:80) = true;
A(B) = NaN;
pcolor(A)
set(gca,'Color','k')

更多回答（1 个）

Image Analyst
Image Analyst 2019-12-3
An example of what you'd like to see would be good. In the meantime, check out patch() and fill().

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