Re: Separating real part and imaginary part from each

*To*: mathgroup at smc.vnet.net*Subject*: [mg101248] Re: [mg101189] Separating real part and imaginary part from each*From*: Porscha Louise McRobbie <pmcrobbi at umich.edu>*Date*: Sat, 27 Jun 2009 06:07:55 -0400 (EDT)*References*: <200906261050.GAA18233@smc.vnet.net>

Hi Alexander, ComplexExpand is what you need. Cheers, Porscha Quoting Alexander <alexander.erlich at gmail.com>: > 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 > > > >

**References**:**Separating real part and imaginary part from each other***From:*Alexander <alexander.erlich@gmail.com>