Re: Collect exponents only
- To: mathgroup at smc.vnet.net
- Subject: [mg101405] Re: [mg101385] Collect exponents only
- From: Bob Hanlon <hanlonr at cox.net>
- Date: Sun, 5 Jul 2009 04:47:47 -0400 (EDT)
- Reply-to: hanlonr at cox.net
expr = A Exp[I (x + y) - I x] + A^2 Exp[I (x + y) - I y];
expr /. Exp[z_] :> Exp[Simplify[z]]
A^2*E^(I*x) + A*E^(I*y)
Map[Simplify, expr, {2}]
A^2*E^(I*x) + A*E^(I*y)
Bob Hanlon
---- Francisco Rojas <fjrojas at gmail.com> wrote:
=============
Hello,
I was wondering if there's anyway to ask the command Simplify (or
maybe some other command) to only collect terms in the exponents of a
long expression (which contains complex exponentials by the way) and
not perform any other kind of simplification.
For example I have an expression like this:
A Exp[ I (x+y) - I x] + A^2 Exp[ I (x+y) - I y] ( I is the
the imaginary unit )
Mathematica does two simplications here: it simplifies the terms in
the exponents and factors out the A giving:
A (Exp[ I y] + Exp[I x])
whereas I would like to obtain only the exponents simplification,
i.e. A^2 Exp[ I y] + A Exp[ I x]
Anybody knows how to do this?
Thanks in advance,
Francisco
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