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Re: Help: 1.#QNAN ??

• To: mathgroup at smc.vnet.net
• Subject: [mg24783] Re: Help: 1.#QNAN ??
• From: "P.J. Hinton" <paulh at wolfram.com>
• Date: Thu, 10 Aug 2000 00:32:20 -0400 (EDT)
• Organization: Wolfram Research, Inc.
• References: <8mqumd$13i@smc.vnet.net>
• Sender: owner-wri-mathgroup at wolfram.com

On 9 Aug 2000, Phil wrote:

> I apologise if this is slightly off-topic, but I imagine many people here
> use Mathematica & C++ in computations. In a C++ program I have used 'double'
> for all of my values in computations. My outputs are usually shown in the
> form 5.324670 etc... but in some cases I get them in this form 1.#QNAN.
> What on earth does this mean? It may be a problem as I want to write my
> values to file to be read in by another application, and I don't suppose it
> will understand what type of value 1.#QNAN is either.

Go check your C++ compiler's documentation.  I suspect that you are trying
to format a number that does not fit within the confines of your
formatting string.  Take a look at the ranges of values you are planning
on displaying and determine whether the formatting string you coded is
really appropriate.

-- 
P.J. Hinton
User Interface Programmer                         paulh at wolfram.com
Wolfram Research, Inc.
Disclaimer: Opinions expressed herein are those of the author alone.