RE: how to specify something is "real"
- To: mathgroup at smc.vnet.net
- Subject: [mg43170] RE: [mg43161] how to specify something is "real"
- From: "David Park" <djmp at earthlink.net>
- Date: Sat, 16 Aug 2003 02:53:52 -0400 (EDT)
- Sender: owner-wri-mathgroup at wolfram.com
K, When it comes to Mathematica there are very few dumb questions! If you use ComplexExpand on an expression, it assumes that all variables are real, or you can supply a list of variables that are not real. Look it up in Help. Sometimes you may also want to restrict the TargetFunctions. Sometimes I think ComplexExpand should be called ComplexSimplify. If you are doing complex analysis you will probably be using it all the time. Cos[x] Conjugate[%] % // ComplexExpand Cos[x] Conjugate[Cos[x]] Cos[x] David Park djmp at earthlink.net http://home.earthlink.net/~djmp/ From: pgp [mailto:bla at bla.com] To: mathgroup at smc.vnet.net Hi, This is probably a dumb question, but I was trying to use Conjugate[] on an expression that contains terms like Cos[x], and mathematica doesn't take it for granted that Cos[x] is real, and hence the end result contain lots of Conjugate's that can't be reduced. Could someone tell me if it's possible to tell mathematica which parts of the expressions are supposed to be real, so it'll get rid of all those Conjugates? Thanks a lot. -K