complex coefficients and rules...
- To: mathgroup at smc.vnet.net
- Subject: [mg28203] complex coefficients and rules...
- From: Richard Easther <easther at physics.columbia.edu>
- Date: Wed, 4 Apr 2001 04:13:25 -0400 (EDT)
- Organization: Inst. for Strings, Cosmology and Astroparticle Physics (ISCAP)
- Sender: owner-wri-mathgroup at wolfram.com
I am having some trouble applying some simple rules to complex
Exp[-4 I y] /. I-> -I
Exp[-4 I y]
This seemed a bit odd, so I looked at the "full form" and found,
Power[E, Times[Complex[0, -4], y]]
However, trying the match
Exp[-4 I y] /. a_ I -> -a I
doesn't work either, since FullForm[a I ] is Times[Complex[0, -1], a]
and so the patterns do not match.
All I want is a simple complex conjugate (the Conjugate function does
not assume that y is real), that maps I->-I. The more tricky
Exp[-4 I y] /. Complex[a_ ,b_] -> Complex[a,-b]
does work, but it is seems a little cumbersome.
In any case my question is: is there a general way to avoid having to do
this, or is Mathematica always going to assume that any algebraic
constant is potentially complex?
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