Re: simple question about NaN and FP exceptions

[Chris Babcock <cbabcock@...>]

On Tue, Feb 22, 2011 at 10:41 AM, Renato Maia <maia@inf.puc-rio.br> wrote:
> On 21 Feb 2011, at 18:37, Dirk Laurie wrote:
>>
>>   (a) NaN is to numbers what nil is to Lua values: not-a-number vs
>>       not-a-value. It makes intuitive sense that it should be logically
>>       different from numbers.
>
> OK, but why this implies NaN should evaluate to false?

Not a value can be none of greater than, equal to or less than a number.

Lua's default behavior with respect to NaN is based on standards
compliance - IEEE 754 as cited in PiL 13.2.

Chris
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