Re: ComplexExpand (V4.0)
- To: mathgroup at smc.vnet.net
- Subject: [mg20388] Re: ComplexExpand (V4.0)
- From: phbrf at t-online.de (Peter Breitfeld)
- Date: Mon, 18 Oct 1999 02:40:32 -0400
- References: <7u7rm9$p3h@smc.vnet.net>
- Sender: owner-wri-mathgroup at wolfram.com
Blimbaum Jerry DLPC <BlimbaumJE at ncsc.navy.mil> schrieb:
> Why does ComplexExpand[Re[1/(x + I y)]] return
>
> x/Abs[x+ I y]^2
>
> rather then x/(x^2+y^2)
>
> The Mathematica manual says that ComplexExpand assumes that the
> variables are real.
>
> thanks. jerry blimbaum NSWC Panama City, Fl
>
I do find this disturbing too, but If you use
ComplexExpand[Re[1/(x+Iy)],TargetFunctions->{Re,Im}]
you get the desired result.
Peter
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