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MathGroup Archive 1999

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how long is a long evaluation?

  • To: mathgroup at smc.vnet.net
  • Subject: [mg19452] how long is a long evaluation?
  • From: psalzman at landau.ucdavis.edu
  • Date: Wed, 25 Aug 1999 01:25:19 -0400
  • Sender: owner-wri-mathgroup at wolfram.com

dear all,

i have a triple integral of a gaussian and a bunch of step functions of 4
variables.  the expression is not that difficult, but it's not exactly 2+2 
either.

last night i started Mathematica on it.  went to bed 4 hours later and when i looked
in the morning, it had reported "out of memory" (i have 96MB).

next i tried doing the integral with only one of the step functions to see
if that sped things up.  so far it's been 4 hours and Mathematica is still plugging
away.

i'm beginning to suspect that the way i've entered the integral is wrong.
i asked the department "mathematica guru" but he had no words of wisdom for
me.   

1- is there a way of telling if Mathematica is still plugging away or is just hung
in some kind infinite loop?   can i see what Mathematica is working on at any given
moment?   what is a reasonable maximum time for a difficult symbolic triple 
integral?   has anyone had something like this that ran for more than 4
hours?  (dual PII/266)

2- would someone be kind enough to look at this notebook?  it's 4 cells
long (so it's terribly short) and i'm sure if there's a mistake, it will be
glaring to the trained eye.

my *sincerest* thanks to anyone who can help.  

pete



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