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
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 > > ______________________________________________ > R-help@r-project.org mailing list > https://stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide > http://www.R-project.org/posting-guide.html > and provide commented, minimal, self-contained, reproducible code. >-- Henrique Dallazuanna Curitiba-Paraná-Brasil 25° 25' 40" S 49° 16' 22" O [[alternative HTML version deleted]]
On Monday, January 24, 2011 07:18:03 pm Alaios 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 > > ______________________________________________ > R-help at r-project.org mailing list > https://stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide http://www.R-project.org/posting-guide.html > and provide commented, minimal, self-contained, reproducible code. >if( sign( x ) == sign( y ) )
if (x*y>0) {...}
On Mon, Jan 24, 2011 at 1:27 PM, Rainer Schuermann
<Rainer.Schuermann at gmx.net> wrote:> On Monday, January 24, 2011 07:18:03 pm Alaios 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
>>
>> ______________________________________________
>> R-help at r-project.org mailing list
>> https://stat.ethz.ch/mailman/listinfo/r-help
>> PLEASE do read the posting guide
http://www.R-project.org/posting-guide.html
>> and provide commented, minimal, self-contained, reproducible code.
>>
>
>
> if( sign( x ) == sign( y ) )
>
> ______________________________________________
> R-help at r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide
http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
>