Re: Quick integral.

• To: mathgroup at smc.vnet.net
• Subject: [mg73434] Re: [mg73393] Quick integral.
• From: Carl Woll <carlw at wolfram.com>
• Date: Fri, 16 Feb 2007 01:03:03 -0500 (EST)
• References: <200702151001.FAA05398@smc.vnet.net>

```Jouvenot, Fabrice wrote:

>Hi everybody,
>
>First I want to apologize not to participate a lot and to be here every
>time I need help...
>
>The purpose of our work is to have something really quick.
>We made some simplifications, approximations, etc.
>
>We have now difficulties to accelerate it.
>We think we can run it faster if we ask Mathematica to calculate our
>integrals with only 2 significant numbers. But we tuned different
>parameters of Intergral to have a rude approximation of the integral and
>so have the calculus quicker than before.
>But (we are beginers with mathematica (but not in programing)) it do not
>seems to be less precise or faster.
>
>I'd like any help to do that.
>
>Moreover any basic (or not) advices to accelerate calculus are welcome.
>Thanks for all,
>Regards,
>
>Fabrice.
>
>
It would help to give an example. Moreover, some details on what you are
trying to do would be good. Why do you want a quick result, does the
integrand have a special form, what are you doing with the integrated
results, etc. Knowing some of these details will be helpful in giving
you the most useful response.

For example, if the integrand has a particular form with only 1 varying
parameter, then an approach using NDSolve can be very effective.

Carl Woll
Wolfram Research

```

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