In line. John Kane Kingston ON Canada
> -----Original Message----- > From: [email protected] > Sent: Fri, 30 Oct 2015 20:40:03 -0500 > To: [email protected] > Subject: Re: [R] If else > > I am trying to change the mydata$sex from character to numeric Why? As Ista (mydata$confusingWillCauseProblemsLater) has pointed out this is a very unusual thing to do in R. Is there a very specific reason for doing this in your analysis. Otherwise it may better to leave the coding as NA. Some of the data mungers here may be able to suggest which is the best strategy in R. R is 'weird' compared to more mundane stats packages such as SAS or SPSS and common techniques that one would use with them often are not appropriate in R. > 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$sex1[1] 2 2 2 2 2 2 2 2 > >> > > > On Fri, Oct 30, 2015 at 8:28 PM, Ista Zahn <[email protected]> wrote: > >> Using numeric for missing sounds like asking for trouble. But if you >> must, something like >> >> mydata$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 <[email protected]> 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]] >>> >>> ______________________________________________ >>> [email protected] 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. >> > > [[alternative HTML version deleted]] > > ______________________________________________ > [email protected] 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. ____________________________________________________________ FREE 3D MARINE AQUARIUM SCREENSAVER - Watch dolphins, sharks & orcas on your desktop! ______________________________________________ [email protected] 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.
