How can I find the mixed partial derivatives using Matlab?

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Seda Kutay
Seda Kutay 2016-12-3
回答： bio lim 2016-12-3
For example, to find d^3f/dxdy^2 of x^4*sin(xy)??

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bio lim
bio lim 2016-12-3
syms x y
f = (x^4)*sin(x*y);
der = diff(f,x,y,y)
der =
- 6*x^5*sin(x*y) - x^6*y*cos(x*y)

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John D'Errico
John D'Errico 2016-12-3
You would differentiate with respect to y twice, so the second derivative, and once with respect to x. Essentially two calls to diff.
help syms
help diff
1st semester calc?

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