MathGroup Archive: October 2008 [00374]

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tiny negative numbers

To: mathgroup at smc.vnet.net
Subject: [mg92849] tiny negative numbers
From: a <arorahina at gmail.com>
Date: Wed, 15 Oct 2008 05:36:47 -0400 (EDT)

Hi,

I am trying to solve a set of differential equations using NDSolve.
But I'm seeing some really tiny negative numbers like this one:
-1.28E-12. I'm guessing this is a machine-precision related problem.
So I was wondering if I can somehow ensure that the variable values
never go below 0, or alternatively, ensure that these tiny numbers
equate to 0?

Thanks!
a

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