Numerical Integration using intgrad3

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newbie 2020-3-10

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https://ww2.mathworks.cn/matlabcentral/answers/510132-numerical-integration-using-intgrad3

回答： darova 2020-3-11

findsurface.m

Hi,

I am trying to calculate the surface from gradient. And I am using intgrad3 get there. The function runs without throwing an error but the surface doesnot look normal to the gradient. Also the values in the ouptut produced by intgrad3 are way higher than what I expect. I realize this may be because of the constant of integration but the range is high too. Any ideas of what I might be doing wrong?

Here is the data and the function:

InputsForFindsurface.m

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darova 2020-3-10

Do you have another data (not so large) ? I don't know if my computer can handle it

The question is unclear: what are you trying to do? Calculate area?

newbie 2020-3-10

SurfaceWorkspace2.mat

I want to generate a surface that is locally normal to the gradient field. Here is the new data, you can run the code without the second input (it is only used for visualization), it will throw an error but after calculating the surface.

The raw data is the positions of cells in 3D. Each 3D cell has a centroid position (x,y,z) in each z-layer. I calculate the direction vectors of each cell and am trying to generate a surface that is normal to these direction vectors.

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