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Re: Time for an integration

  • To: mathgroup at smc.vnet.net
  • Subject: [mg100893] Re: Time for an integration
  • From: Alexei Boulbitch <Alexei.Boulbitch at iee.lu>
  • Date: Thu, 18 Jun 2009 04:48:34 -0400 (EDT)

Hello ! 

I have an integral to perform 4096 times: it is a 3dimensionnal integral over a matrix of 4096.4096 points.

It takes many hours and I still does not have the result. I made a loop with NIntegrate.

Is it possible that an integration loop in mathematica takes so long ? Is there any ways to improve it ?

Thank you

Lena

Hi, Lena,
in general -yes. Think about replacing your loop by Table or Nest or comparable (depending of what precisely you are doing).
It would be helpful, if you show your code. But do not do it in its original size, just do 10 times 10 by 10 or alike. 
Regards, Alexei

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