how I can replace diff(x(t), t) with xdot ?
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>> syms t;
>> x=sym('x(t)');
>> f=sin(x);
>> diff(f,t)
ans =
cos(x(t))*diff(x(t), t)
回答（1 个）
Oleg Komarov
2012-9-29
syms t xdot;
x = sym('x(t)');
f = sin(x);
df = diff(f,t);
subs(df,'diff(x(t), t)',xdot)
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2012-9-29
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