Use a symfun as index of a matrix

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DZ AI
DZ AI 2015-12-15
回答： amin ya 2018-12-25
Hi everybody, I have a notation problem.
syms f(t) g(t)
v lxmxn 3d matrix
I am to write an equation like:
eq = diff(f) == v(f(t),g(t),t)
but i get a sym/subsindex error.
how can I access elements of a matrix indexed by a function?

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回答（1 个）

amin ya
amin ya 2018-12-25
use formula to convert symfun to a matrix:
matrix=formula()

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