[R] If else

[Val]

I am trying to change the mydata$sex  from character to numeric
I want teh out put like
   id  sex
      1  NA   0
      2  NA   0
      3  M     1
      4  F     2
      5  M    1
      6  F     2
      7  F    2

mydata$sex1 <- 0
if(mydata$sex =="M " ){
  mydata$sex1<-1
} else {
  mydata$sex1<-2
}

mydata$sex1

Warning message:In if (mydata$sex == "M ") { :
  the condition has length > 1 and only the first element will be
used> mydata$sex1[1] 2 2 2 2 2 2 2 2

>


On Fri, Oct 30, 2015 at 8:28 PM, Ista Zahn <istazahn at gmail.com> wrote:

> Using numeric for missing sounds like asking for trouble. But if you
> must, something like
>
> mydata$confusingWillCauseProblemsLater <-
>   ifelse(
>     is.na(mydata$sex),
>     0,
>     as.numeric(factor(mydata$sex,
>                       levels = c("M", "F"))))
>
> should do it.
>
> Best,
> Ista
>
> On Fri, Oct 30, 2015 at 9:15 PM, Val <valkremk at gmail.com> wrote:
> > Hi all,
> > Iam trying to change character  to numeric but have probelm
> >
> > mydata <- read.table(header=TRUE, text=', sep=" "
> >      id  sex
> >       1  NA
> >       2  NA
> >       3  M
> >       4  F
> >       5  M
> >       6  F
> >       7  F
> >        ')
> >
> > if sex is missing then sex=0;
> > if sex is"M" then sex=1;
> > if sex is"F" then sex=2;
> >
> > Any help please ?
> >
> >         [[alternative HTML version deleted]]
> >
> > ______________________________________________
> > R-help at 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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