Plotting curvature of a surface

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AB
AB 2017-9-1
编辑： Walter Roberson 2017-9-2
Hello, I am trying to plot the curvature of the surface (attached) using patch_curvature https://www.mathworks.com/matlabcentral/fileexchange/32573-patch-curvature
I get the following error when I run it:
> In patchcurvature>VectorRotationMatrix (line 246)
In patchcurvature (line 94)
Warning: Matrix is singular, close to singular or badly scaled. Results may be inaccurate. RCOND = NaN.
> In patchcurvature>VectorRotationMatrix (line 246)
In patchcurvature (line 94)
Warning: Matrix is singular, close to singular or badly scaled. Results may be inaccurate. RCOND = NaN.
> In patchcurvature>VectorRotationMatrix (line 246)
In patchcurvature (line 94)
Warning: Matrix is singular, close to singular or badly scaled. Results may be inaccurate. RCOND = NaN.
> In patchcurvature>VectorRotationMatrix (line 246)
In patchcurvature (line 94)
Warning: Matrix is singular, close to singular or badly scaled. Results may be inaccurate. RCOND = NaN.
> In patchcurvature>VectorRotationMatrix (line 246)
In patchcurvature (line 94)
Can anybody help me please?
Thanks!

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