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I have a data extracted from Comsol on some node points and I know the coordinates of each node.

Does anyone know how Comsol calculate the partial derivative from the values at each node and also using the coordinate information?

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    $\begingroup$ I can't talk about Comsol specifics, but in general, the derivatives are computed inside each element using the interpolation functions. $\endgroup$ – nicoguaro Sep 11 at 17:24
  • $\begingroup$ That's a question best asked on the Comsol forums. $\endgroup$ – Wolfgang Bangerth Sep 12 at 3:36
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    $\begingroup$ I agree with Wolfgang, it is better to ask on Comsol forums. However, if you are unable to find out this information "the easy way" and really need it, you might want to ask a different question: "how to design a computational experiment to find out XXX". I advice against it before you try easier options. $\endgroup$ – Anton Menshov Sep 13 at 20:44

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