Differential wrt qDot(t)

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Saifuran Noori
Saifuran Noori 2018-4-11
回答： Ngoc Thanh Hung Bui 2018-4-17
syms t_1(t)
f = sin(t_1) + cos(t_1)
diff(f, t) % Is Ok
diff(f, t_1) % should give us = cos(t_1)-sin(t_1), but we get error:
"Error using sym/diff Arguments, except for the first, must not be symbolic functions."
How should we calculate this in matlab?

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Ngoc Thanh Hung Bui
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