Simplification of complex symbolic fratcion

Hello,

I have a complex symbolic fraction.

syms U_1 R C omega positive
U_2 = -(U_1*sym(1i))/(C^2*R^2*omega^sym(2)*sym(1i) + 3*C*R*omega - sym(1i))

U_2 = 

How can i get rid of the imaginary unit as common factor in the numerator and the denominator of this fraction.

simplifyFraction(U_2)

ans = 

does not work.

Kind regards

Michael

Answer 1

[Walter Roberson]

syms U_1 R C omega positive
U_2 = -(U_1*sym(1i))/(C^2*R^2*omega^sym(2)*sym(1i) + 3*C*R*omega - sym(1i))

U_2 = 

[N, D] = numden(U_2)

N = 

D = 

U_2a = (N*1i)/(D*1i)

U_2a = 

[Michael]

Thank you Walter,

so there is no other command or option to get rid of an imiganry (or cmplex) common factor?

Michael

[Walter Roberson]

Yes, of course there are other options. For example you could use feval(symengine) to pass commands directly into the symbolic engine using MuPad language constructs.

But you are not going to be able to just call simplify() or rewrite()

[Michael]

Thank you for the explanation.

Michael