interpolatesolution is giving NaN results

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Khalid Ibne Masood 2020-8-4

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https://ww2.mathworks.cn/matlabcentral/answers/574762-interpolatesolution-is-giving-nan-results

评论： Ravi Kumar 2020-8-5

Hello,

I am trying to solve a Laplace equation over a rectangular domain using the FEA tool in Matlab. The solution is okay, but I wanted to interpolate the result over a very dense regular grid using the command interpolateSolution. The problem is, interpolated result is showing NaN values evenif the point is inside the region. I have attached two figures here. The first one is for the PDE solution and there is no white spot. .

The second one is the interpolated value, and as it is seen easily there are white spot that correspond to the NaN values.

Why the interpolation is giving NaN values? How I can solve this issue?

Thank you.

Khalid

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KSSV 2020-8-4

Image is not attached....What function did you try for interpolation? Read about fillmissing.

Ravi Kumar 2020-8-5

That seems odd, you should not get NaN if your points are within the goemetry. What version of MATLAB are you using. Also try if you get the same issue if you change the mesh order from linear to quadratic and vice versa. You might also try reducing the mesh density. If you can provide repro code that would help debug the issue.

Regards,

Ravi

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