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Re: complex analysis problem in mathematica 3.0

• To: mathgroup at smc.vnet.net
• Subject: [mg48481] Re: complex analysis problem in mathematica 3.0
• From: klishko at mail.ru (Alex Klishko)
• Date: Tue, 1 Jun 2004 03:02:59 -0400 (EDT)
• References: <c9ec75$g9q$1@smc.vnet.net>
• Sender: owner-wri-mathgroup at wolfram.com

BranasMan <branasREmoVe at mail.inet.hr> wrote in message news:<c9ec75$g9q$1 at smc.vnet.net>...
> 
> H=1 / (1 + j2w -2w^2 - jw^3)
> 
> i would like to get that function in shape of : 
> H=something + j*something_else i.e. the complex
> and real part apart.
> 
> i played with Re and Im,but it seems that the fact that
> "w" is a variable confuses mathematica?!

I think, it confuses because of a variable w may also be a comlex number.
If w is a real try ComplexExpand -fuction.
For example:

H = 1 / (s^3 + 2s^2 + 2s + 1) /. s -> \jw 
ComplexExpand[%]

Wishes,
Alex Klishko