Try this:

!diff(sign(c(x, y)))


On Mon, Jan 24, 2011 at 4:18 PM, Alaios <alaios@yahoo.com> wrote:

> Hello :)
> I wanted to right an expression to check when x and y have the same sign
> and I wrote the following:
>
>  if ((x<0 && y<0) || (x>0 && y>0))
>
> which looks pretty ugly to me.
>
> Can you please suggest me a better way for that?
>
> Regards
> Alex
>
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>



-- 
Henrique Dallazuanna
Curitiba-Paraná-Brasil
25° 25' 40" S 49° 16' 22" O

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