Re: How to get the Real and Imaginary part of an expression

*To*: mathgroup at smc.vnet.net*Subject*: [mg129326] Re: How to get the Real and Imaginary part of an expression*From*: James Stein <mathgroup at stein.org>*Date*: Sat, 5 Jan 2013 02:16:25 -0500 (EST)*Delivered-to*: l-mathgroup@mail-archive0.wolfram.com*Delivered-to*: l-mathgroup@wolfram.com*Delivered-to*: mathgroup-newout@smc.vnet.net*Delivered-to*: mathgroup-newsend@smc.vnet.net*References*: <20130103021627.CBD1368B0@smc.vnet.net>

Re and Im work for me, here is what I tried, giving values to s and z: Module[{w, s, z}, s = 5 + 3 I; z = 12 - 2 I; (w = 882)/(s^2 + 2*z*w*s + w^2) ] Re[%] Im[%%] Perhaps I do not understand your question. On Wed, Jan 2, 2013 at 6:16 PM, Eduardo M. A. M. Mendes < emammendes at gmail.com> wrote: > Hello > > I need to extract the real and imaginary part of the following expression > > (w=882)/(s^2+2*z*w*s+w^2) > > where w and z are positive constants. s is a complex variable. > > Applying Re and Im to the expression does not do much. By hand, one can > easily find them. > > What am I missing? > > many thanks > > Ed > > > >

**References**:**How to get the Real and Imaginary part of an expression***From:*"Eduardo M. A. M. Mendes" <emammendes@gmail.com>