Re: Defining Real Expressions
- To: mathgroup at smc.vnet.net
- Subject: [mg8535] Re: Defining Real Expressions
- From: Raya Firsov-Khanin <raya at mech.ed.ac.uk>
- Date: Sat, 6 Sep 1997 23:16:07 -0400
- Sender: owner-wri-mathgroup at wolfram.com
Marco Beleggia wrote:
<I must evaluate an Integral in which I'd like to assign real values to
<some parameters, but I don't know how to do that.
<For example, in the following integral (a Fourier Transform):
<f[x_,p_]=Integrate[y/(x^2+y^2) Exp[-I p y],{y,-Infinity,Infinity}],
<p should be a real parameter. The output given by Mathematica is
<conditioned to Im[p]==0, such as If[Im[p]==0,....,....], which is not
<easy to handle, and I'd like to avoid this complication.
<Is it possible ?
The simplest way to deal with this is to declare
p/:Im[p]=0
Then, f[x, p] will give you an answer (if Arg[x^2]!=\[Pi]).
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Raya Khanin