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