Re: Empty? No. Array? No. Has? Yes.

[Andrew Starks <andrew.starks@...>]

On Saturday, July 6, 2013, Javier Guerra Giraldez  wrote:
> On Sat, Jul 6, 2013 at 12:07 PM, Jose Torre-Bueno <jtorrebueno@cox.net> wrote:
>
> > I am not understanding what is wrong with using nan as a place holder
>
> > n1=0/0
> > n2=0/0
> > print (n1, n2, n1==n2, n1==n1)
> -nan    -nan    false   false
>
> how do you use a placeholder that can't be equal to anything, not even
> to itself?
>
>
> --
> Javier

type(n1) ~= "string" and tostring(n1) == "-nan"

? Is it type number? If so, it's the only number not equal to itself, so you've got that going for it.