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