RE: about real part
- To: mathgroup at smc.vnet.net
- Subject: [mg41201] RE: [mg41176] about real part
- From: "David Park" <djmp at earthlink.net>
- Date: Wed, 7 May 2003 03:52:04 -0400 (EDT)
- Sender: owner-wri-mathgroup at wolfram.com
Duanxiang,
First you have to put spaces between the variables you are multiplying. Then
you have to use ComplexExpand.
Re[( I w t + (L + 1)L t D)^1/2]
% // ComplexExpand
(1/2)*(-Im[t*w] + Re[D*L*(1 + L)*t])
(D*L*t)/2 + (1/2)*D*L^2*t
In doing complex algebra you will have to use ComplexExpand a lot. (It
should almost be called ComplexSimplify.) Also, check the TargetFunctions
option for ComplexExpand. You will sometimes want to use...
ComplexExpand[expr, TargetFunctions -> {Re,Im}]
David Park
djmp at earthlink.net
http://home.earthlink.net/~djmp/
From: Duanxiang Xu [mailto:duanxiangxu at yahoo.com]
To: mathgroup at smc.vnet.net
Hi, all
I have problem when I was trying to get the real part
of a complex expression,
like
Re[(Iwt+(L+1)LtD)^1/2]
here w,L,D are real paramaters and t is real variable
Mathematica seems could do nothing about this
Anyone could help me?
Thanks,
Duanxiang
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