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Problem with plotting derivative
Posted Oct 3, 2023, 1:00 p.m. EDT Studies & Solvers Version 5.5 1 Reply
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Hi!
I have following problem. By using Magnetic Fields(mf) I am simulating magnetic fields for certain current coil(s) configuration. After that I am using 1D plot group and consequently line graph for plotting. I am trying to plot following quantity: d/dx(atan(Bz / Bx)) vs x for y = z = 0. For that I am assigning y axis following formula: d(atan(mf.Bz / mf.Bx), x) that returns me 0 value.
Is there some intermediate steps where I have to explicitly assign some expression as a function of x in order for derivative to not end up being 0? How else can I manage calculating derivatives?
Thank you
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This is a common question that is addressed in one of our blogs, see:
https://www.comsol.com/blogs/plotting-spatial-derivatives-magnetic-field
-------------------Magnus