Re: checking for Not a Number?

[Luiz Henrique de Figueiredo <lhf@...>]

> So, can anybody weigh in on this? Is this a bug? If not, why not?

It is not a bug. On IEEE 754 hardware, you can have "numbers" x that do not
satisfy x==x:

% lua51
Lua 5.1.1  Copyright (C) 1994-2006 Lua.org, PUC-Rio
> x=math.log(-1)
> =x
nan
> = x==x
false

What compiler are you using?
--lhf