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How to get the derivative of a specific coordinate point?

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I defined a piecewise function VFUNC as a variable. When calculating this function, I need to use the derivative of the specific coordinate X0 (the piecewise position). How should this specific point be represented? I can't get the derivative of a specific point with d (x, y).

Thanks!


0 Replies Last Post 07/12/2019, 07:00 GMT-5
COMSOL Moderator

Hello Howey Hu

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