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How to plot contour plot with NaN in matrix ?

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Karthik
Karthik 2014-12-10
评论： Star Strider 2014-12-12
I have three matrices xvalues (X), yvalues (Y) and measured property (Z). All these three are upper triangular matrices with lower triangular part containing NaN values. How do I plot a contour plot only for the upper triangular part?

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回答（1 个）

Star Strider
Star Strider 2014-12-10
编辑：Star Strider 2014-12-10
I would use the triu function. The lower triangular part would return as zeros.
If you plotted it as it currently exists, the NaN values would simply not plot anything, that is be blank areas of the contour plot.
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Karthik
Karthik 2014-12-12
编辑：Karthik 2014-12-12
Hi, I attached the code. Actually, my Y matrix contains "Inf" on the main diagonal. To get rid of that value I replaced the lower part of X and Y matrices with NaN including the main diagonal. because, i am interested only in the upper part. When I use contour function, I am getting the desired plot. I need the same plot with filled contours. I tried the one suggested above. But, I also need the axes (X,Y) also shown. Thanks
Star Strider
Star Strider 2014-12-12
I have no idea what you’re doing, but you can see what the result is if you replace the contourf plot with surfc:
surfc(X,Y,Z)
To see only ‘Z’:
surfc(Z)
The problems with ‘X’ and ‘Y’ can be seen if you plot them:
surfc(X)
surfc(Y)
The point is that ‘X’ and ‘Y’ are not linear, and ‘Z’ seems not to exist along the diagonal.
I’ll leave you to sort these. The plotting is trivial once you deal with whatever is going on with your data.

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