Groups > comp.soft-sys.math.mathematica > #2397

Re: Numerical/analytical integration around a pole

From	Peter Pein <petsie@dordos.net>
Newsgroups	comp.soft-sys.math.mathematica
Subject	Re: Numerical/analytical integration around a pole
Date	2011-05-15 11:05 +0000
Organization	Steven M. Christensen and Associates, Inc and MathTensor, Inc.
Message-ID	<iqoc2a$m9s$1@smc.vnet.net> (permalink)
References	<201105110828.EAA01400@smc.vnet.net> <iqg5t7$d0i$1@smc.vnet.net>

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Am 12.05.2011 10:31, schrieb A. Lapraitis:
> Thanks to Gary Wardall and Murray Eisenberg for quick responses.
> 
> I forgot to say I was having the problem on 7.0.1.0 on Linux x86
> (64-bit). Since people are not experiencing the strange behaviour on
> v8, it is fair to conclude that the bug got fixed.
> 

And while using Version 7, try to Rationalize[..,0] the integrand in
Integrate:

In[2]:= Through[{Composition[N,Integrate],NIntegrate}
                  [1/(Rationalize[y[x],0]+I/1000),{x,1/2,7/10}]]
Out[2]= {0.323456-3.37701 I,0.323456-3.37701 I}

but this lasts a little while.

Peter

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Re: Numerical/analytical integration around a pole "A. Lapraitis" <ffcitatos@gmail.com> - 2011-05-12 08:31 +0000
  Re: Numerical/analytical integration around a pole Peter Pein <petsie@dordos.net> - 2011-05-15 11:05 +0000

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