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Re: NIntegrate or For or Special Function?

• To: mathgroup at smc.vnet.net
• Subject: [mg47717] Re: NIntegrate or For or Special Function?
• From: "Alan" <info at optioncity.REMOVETHIS.net>
• Date: Fri, 23 Apr 2004 02:30:46 -0400 (EDT)
• References: <c67qg0$h0a$1@smc.vnet.net>
• Sender: owner-wri-mathgroup at wolfram.com

"Matt Swingle" <mss4 at duke.edu> wrote in message
news:c67qg0$h0a$1 at smc.vnet.net...
> I am constructing filling entries in a matrix using For loops.  The
> individual entries come from integrating Bessel, Hankel and Kelvin
> functions numerically with NIntegrate.  A 100x100 matrix takes a few hours
> to run?  Is my procedural way of doing things to blame?  Is it the
> specialty functions (Bessel etc)?  Is it simply NIntegrate?  Would anyone
> be willing to look at my awful code?
>
> Any help would be greatly appreciated.

It all sounds quite normal to me. At say 1 sec per integration,
it would take about 3 hrs to do 10000 of them.

Are you sure your matrix has that many
distinct entries or is there perhaps some structure you have
failed to exploit?

regards,
alan