Problem with D and Abs
- To: mathgroup at smc.vnet.net
- Subject: [mg60970] Problem with D and Abs
- From: Daniele Lupo <danwolf80_no_spam_ at libero.it>
- Date: Wed, 5 Oct 2005 02:28:21 -0400 (EDT)
- Sender: owner-wri-mathgroup at wolfram.com
Hi to all.
I've a problem with this expression:
\!\(Abs[\(Conjugate[s11]\ g\_s\)\/\(1 + Abs[s11]\^2\ \((\(-1\) + g\_s)\)\)
Ã\_0\/\(1 + N\_i\)] - \@\(N\_i\ \((1 - Abs[Ã\_0]\^2 + N\_i)\)\)\/\(1 +
I want to have derivative in gs. If I use D, I obtain a strange result,
that invoke Abs'[...], that's not correct, naturally.
I've tried to use PiecewiseExpand, but I've a problem. In this expression,
\!\(g\_s\) and \!\(N\_i\) are real, while \!\(Ã\_0\) and s11 are complexes.
I don't know how to create an expansion that consider some symbol as real,
and some other as complex.
How can I do it?
Thanks for your answers.
PS I'm using version 5.1, WinXP
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