Re: NaNs not propagating

[Allin C. <cot...@wf...>]

On Tue, 4 Nov 2014, pl...@pi... wrote:

[...]
>
> What is the correct way to trap this condition?
>
> (isNaN($2))   undefined function: isNaN
> ($2==NaN)   never true
> ($2==0)   not true for NaN in col 2
> (exists($2) always true, even for NaN
>
> Is there currently a test condition that will trap NaN in the datafile ?

If it works like C, the test $2!=$2 should do it. A NaN tests as not 
equal to itself!

Allin Cottrell