Separating real part and imaginary part from each other

*To*: mathgroup at smc.vnet.net*Subject*: [mg101189] Separating real part and imaginary part from each other*From*: Alexander <alexander.erlich at gmail.com>*Date*: Fri, 26 Jun 2009 06:50:54 -0400 (EDT)

Hi, suppose I have the expression f(z) = (a*z+b) / (c*z+d) with z=x+I*y I did the calculation by hand and was able to separate real part fom imag. part to obtain something like this: g=f(x+I*y) = Re(g) + I * Im(g) But I don't know how to do this in Mathematica. I tried FullSimplify, Together, Apart, they didn't work. Can you help me? Alexander

**Follow-Ups**:**Re: Separating real part and imaginary part from each***From:*Murray Eisenberg <murray@math.umass.edu>

**Re: Separating real part and imaginary part from each***From:*Porscha Louise McRobbie <pmcrobbi@umich.edu>