How to replace the variable s with the complex variable jw?

Hi everyone,

i'll explain my problem.

I have a polynomial P(s) and I would like to replace s with the complex variable jw in such a way as to solve the polynomial P(jw)=0 in the variable w.

possible solutions?

[Dyuman Joshi]

Assuming you are working with symbolic variables, use symbolic substitution - subs

[mir]

yes, but if i use subs to replace jw to s i can't solve the polynomial in the variable w.

[Dyuman Joshi]

"... can't solve the polynomial in the variable w."

What makes you think so?

syms x y z

z = x^2-3*x+2

z = 

z = subs(z,x,y)

z = 

out = solve(z)

out = 

@mir It would be better if you attach/copy-paste your code here and specify what is it that you are trying to do.

[mir]

Thanks @Dyuman Joshi

[Sam Chak]

@mir, are you trying to solve this ?

[mir]

@Sam Chak yes, i solved