How do I convert a variable that is already in rectangular form to polar?

I have been using complex numbers in a matrix and they are in rectangular. I am trying to display those values in polar form.

Answer 1

[madhan ravi]

see resource https://www.mathworks.com/matlabcentral/answers/113701-how-do-i-convert-from-complex-numbers-a-bi-to-a-polar-form-r-theta#answer_122177

x=2+3j
rho=abs(x)
theta=angle(x)
%-------------------
x=rho*exp(j*theta)

or maybe https://www.mathworks.com/help/matlab/ref/cart2pol.html ?