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*Subject*: summation problem*From*: "Manish" <mrmanish(at)bigfoot.com>*Date*: Thu, 5 Apr 2001 11:58:27 +0100*Newsgroups*: comp.lang.idl-pvwave*Organization*: The Open Univeristy*Xref*: news.doit.wisc.edu comp.lang.idl-pvwave:24372

Hi, I'm pretty new to IDL (well, actually completely new!) and was wondering if anyone could help with a small problem. I have a program which produces an array of values of sunlight flux during the day. Unfortunately, it produces crazy numbers before the sunrises and after it sets(as expected). I'm summing the values throughout the day to get a total integrated day flux, but here's the problem - is there a way of telling the TOTAL function to ignore negative numbers and NaN numbers? I guess this is a simple problem, but would appreciate any help Many thanks, Manish

**Follow-Ups**:**Re: summation problem***From:*Jaco van Gorkom

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