Re: ComplexExpand (V4.0)
- To: mathgroup at smc.vnet.net
- Subject: [mg20396] Re: ComplexExpand (V4.0)
- From: "Stephen P Luttrell" <luttrell at signal.dra.hmg.gb>
- Date: Tue, 26 Oct 1999 00:32:51 -0400
- Organization: Defence Evaluation and Research Agency
- References: <7u7rm9$p3h@smc.vnet.net>
- Sender: owner-wri-mathgroup at wolfram.com
Blimbaum Jerry DLPC <BlimbaumJE at ncsc.navy.mil> wrote in message news:7u7rm9$p3h at smc.vnet.net... > 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. I have $Version = "4.0 for Microsoft Windows (April 21, 1999)" This does what you want: ComplexExpand[Re[1/(x + I y)], TargetFunctions -> {Re, Im}] -- Stephen P Luttrell Room EX21, Defence Evaluation and Research Agency Malvern, Worcs, WR14 3PS, U.K. luttrell at signal.dera.gov.uk 01684-894046 (phone), 01684-894384 (fax) http://www.dera.gov.uk/cis5pip/Welcome.html