In Symbolic Math, how do you output a partial derivative as a variable?

Hello

How can I do this?

y = sin(theta)

yPrime = diff(y,t)

The output I need is omega*cos(theta)

Matlab outputs the partial derivative of theta with respect to t. How can I replace the partial derivate for a variable?

Thank you!

Answer 1

[Walter Roberson]

odeFunction()

Or

syms theta(t) omega
dtheta = diff(theta,t);
y = sin(theta);
yPrime = subs(diff(y,t), dtheta, omega);

[Juan Pablo Velasco Ochoa]

Thank you!!