[R] Creatng new variable based upon conditions

PIKAL Petr petr@p|k@| @end|ng |rom prechez@@cz
Fri Jul 27 09:42:22 CEST 2018


Hi

Or maybe without ifelse

xy$w <- with(xy, x * ((y != "A") + 2) * 5)

Cheers
Petr

> -----Original Message-----
> From: R-help <r-help-bounces using r-project.org> On Behalf Of Dénes Tóth
> Sent: Thursday, July 26, 2018 10:10 PM
> To: JEFFERY REICHMAN <reichmanj using sbcglobal.net>; r-help using r-project.org
> Subject: Re: [R] Creatng new variable based upon conditions
>
>
>
> On 07/26/2018 08:58 PM, JEFFERY REICHMAN wrote:
> > Given something like ...
> >
> > x <- c(3,2,4,3,5,4,3,2,4,5)
> > y <- c("A","B","B","A","A","A","A","B","A","B")
> > xy <- data.frame(x,y)
> > xy$w <- ifelse(xy$y=="A",xy$w[,x]*10,xy$w[,x]*15 )
>
> You should learn the basics about how to extract or replace part of an object, in
> particular data.frames. You can start by reading the help page of ?"Extract".
>
> xy$w <- ifelse(xy$y=="A",xy$x*10,xy$x*15 )
>
> HTH,
> Denes
>
>
> >
> > want to see
> >
> >     x y  w
> > 1  3 A 30
> > 2  2 B  30
> > 3  4 B  60
> > 4  3 A  30
> > 5  5 A  50
> > 6  4 A  40
> > 7  3 A  30
> > 8  2 B  30
> > 9  4 A  40
> > 10 5 B  75
> >
> > but I get NA's
> >
> > Jeff
> >
> > ______________________________________________
> > R-help using r-project.org mailing list -- To UNSUBSCRIBE and more, see
> > 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.
> >
>
> ______________________________________________
> R-help using r-project.org mailing list -- To UNSUBSCRIBE and more, see
> 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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