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Re: numerical integration

  • To: mathgroup at smc.vnet.net
  • Subject: [mg110628] Re: numerical integration
  • From: Peter Pein <petsie at dordos.net>
  • Date: Tue, 29 Jun 2010 06:59:28 -0400 (EDT)
  • References: <i09fgp$526$1@smc.vnet.net>

Am Mon, 28 Jun 2010 06:29:45 +0000 (UTC)
schrieb ofer <ofershl at gmail.com>:

> hi,
> i have a pretty nasty double integral which i need to solve
> numerically but mathematica gives me  error messages when i try to
> solve  it straightforward using NIntegrate
> 
> the integrand is:
> 
> Exp[-I*\[Lambda]*(x+y)]*(x-y)*((Sinh[Pi*(x+I*\[Epsilon])]*Sinh[Pi*(y-I*\[Epsilon])])^-2
> -(Sinh[Pi*(x-I*\[Epsilon])]*Sinh[Pi*(y+I*\[Epsilon])])^-2)
> 
> in the limits x=-infinity..infinity, y=-infinity..infinity
> 
> with epsilon==>0
> 
> i'm new to mathematica  and will  appreciate any suggestions
> 

Assuming you replaced epsilon and lambda by numerical values, I can not
understand why NIntegrate fails. If you didn't so, you'll get an error
stating that the integrand is nowhere numeric. ("The integrand" ...
"has evaluated to non-numerical values for all sampling points in the
region with boundaries"...)

Peter



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