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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
>
>
>
>




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