Re: [R] apply( )

From: Gabor Grothendieck <ggrothendieck_at_gmail.com>
Date: Thu, 10 May 2007 14:09:10 -0400

Sorry, you wanted or, not and.

with(foo, pmax(x < y, x > z))

with(foo, as.numeric(x < y | x > z))

with(foo, 1*(x < y | x > z))

On 5/10/07, Gabor Grothendieck <ggrothendieck_at_gmail.com> wrote:
> or
>
> with(foo, (x < y) * (x > z))
>
> On 5/10/07, jim holtman <jholtman_at_gmail.com> wrote:
> > You don't need apply. Just do
> >
> > foo$result <- ifelse((foo$x < foo$y) | (foo$x > foo$z), 1, 0)
> >
> > On 5/10/07, Greg Tarpinian <sasprog474_at_yahoo.com> wrote:
> > > I have a question that must have a simple answer (but eludes me).
> > > I need a row-by-row logical comparison across three numeric variables
> > > in
> > > a data frame: foo$x, foo$y, foo$z. The logic is
> > >
> > > if( x < y || x > z ) 1 else 0
> > >
> > > for a particular row.
> > >
> > > It is simple and very inefficient to use for(i in 1:length(foo$x)){ }
> > > loops. How can I accomplish this using sappy( ) / lapply( ) / apply( )
> > > or some other more efficient method?
> > >
> > > Thank you in advance,
> > >
> > > Greg
> > >
> > > ______________________________________________
> > > R-help_at_stat.math.ethz.ch 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.
> > >
> >
> >
> > --
> > Jim Holtman
> > Cincinnati, OH
> > +1 513 646 9390
> >
> > What is the problem you are trying to solve?
> >
> > ______________________________________________
> > R-help_at_stat.math.ethz.ch 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.
> >
>



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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. Received on Thu 10 May 2007 - 18:16:10 GMT

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