how I can replace diff(x(t), t) with xdot ?

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Ahmed Eltayeb
Ahmed Eltayeb on 29 Sep 2012
>> syms t;
>> x=sym('x(t)');
>> f=sin(x);
>> diff(f,t)
ans =
cos(x(t))*diff(x(t), t)
  1 Comment
Ahmed Eltayeb
Ahmed Eltayeb on 29 Sep 2012
sorry my question is: how I can replace diff(x(t), t) with xdot ? thanks

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Answers (1)

Oleg Komarov
Oleg Komarov on 29 Sep 2012
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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