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How to compute the derivative of magnetic field?

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Hello everyone.

I am learning "scattering nanosphere", a model in the library of wave optics module.
I try to acquire the derivative of magnetic field, e.g. , d(ewfd.By, z).
The result is zero everywhere. But ewfd.By is not homogenous in any direction at all.
I find that this problem happens in many 3D models, but 2D models are fine.

Please, anyone tells where I am wrong.
Thank you very much.

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