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Substitue Symbolic Derivative Term

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Rajmohan
Rajmohan 2014-3-31
评论： Walter Roberson 2014-4-1
I defined symbolic variables and function and took its derivative:
syms t x(t) xdot
A=sin(x);
diff(A,t)
This generated - D(x)(t)*cos(x(t))
Next I tried using the subs command to replace 'D(x)(t)' with xdot but didnt have any success. Does anyone know how to conduct this substitution? What is exact syntax?
Thanks!
Rajmohan
  1 个评论
Walter Roberson
Walter Roberson 2014-4-1
What shows up if you use
evalin(symengine, 'PRETTYPRINT := FALSE');
feval(symengine, 'print', 'NoNL', diff(A,t))

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