From: Alex DeCaria <alex.decaria@...>
Date: 2010-04-02T05:39:09+09:00
Subject: Re: Is there a method to set variable to NaN or Infinity?

> I'm curious: which languages have a -NaN value and why would you want
> to use it instead of just NaN?

I do a lot of my scientific programming in IDL.  It allows explicit 
assignment of NaN and -NaN to floating point variables, as well as 
returns -NaN under certain circumstances.  IDL is used for a lot of 
image processing, and being able to have NaN and/or -NaN is useful as a 
mask when processing the arrays.

--Alex
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