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Re: [OT] calling isnan

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Re: [OT] calling isnan

Subject: Re: [OT] calling isnan
From: Jerry <email@hidden>
Date: Sat, 19 Feb 2005 15:13:22 +0000


On 19 Feb 2005, at 01:27, Bill Northcott wrote:

The solution for any math library for C++ (such as libRmath) is to program your own isnan() like function that access the underlying system functions.

At the risk of moving off-topic: I've seen people checking for NaN by doing

if (!(x == x))
	.....

It sounds plausible, but is it always valid?

Jerry

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  >Re: [OT] calling isnan (From: Bill Northcott <email@hidden>)




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