I have found a solution to the problem. formula
the elements of my symbolic matrix are functions
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this is my code
syms l xita(t)
r0=[l/4*cosd(xita);l/4*sind(xita)];
dfr0=diff(r0,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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