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

Question

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

odeFunction()

Or

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