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Math Forum » Discussions » Software » comp.soft-sys.math.mathematica

Topic: How to get the Real and Imaginary part of an expression
Replies: 10   Last Post: Jan 5, 2013 2:18 AM

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James Stein

Posts: 126
Registered: 5/8/10
Re: How to get the Real and Imaginary part of an expression
Posted: Jan 5, 2013 2:17 AM
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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@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
>
>
>
>

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