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the elements of my symbolic matrix are functions

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binbin cao
binbin cao 2021-9-14
回答： binbin cao 2021-9-14
Ran in:
this is my code
syms l xita(t)
r0=[l/4*cosd(xita);l/4*sind(xita)];
dfr0=diff(r0,t)
dfr0(t) = 
drf0 is a symbolic matrix, i want to refer to an element in the matrix, but drf0(1) or drf0(2) is t = 1/2, so how can i get one element in the matrix, thank you!

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binbin cao
binbin cao 2021-9-14
I have found a solution to the problem. formula

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