Dear Chun-Hao,
How about this?
diet<-sort(rep(x=c("C","T"),4))
vesl<-rep(x=c("A","P"),4)
mydata<-data.frame(diet,vesl)
mydata$trt<-with(mydata,paste(diet,vesl,sep=""))
mydata
HTH,
Jorge
On Thu, Feb 19, 2009 at 2:53 AM, Chun-Hao Tu <tc...@hotmail.com> wrote:
>
>
> Hi R users,
>
> I did do the research and work on for hours, but I still don't know how to
> solve my silly problem. I try to creat a new variable in my dataset.
>
> such as if diet=="C" && vesl=="P" then trt="CP"; if diet=="C" && vesl=="A"
> then trt="CA";..... The following is my code (It does not work correctly).
>
> Could anyone give me a hint? Appreciate!
>
>
>
> > diet<-sort(rep(x=c("C","T"),4))
> > vesl<-rep(x=c("A","P"),4)
> > mydata<-data.frame(diet,vesl)
> >
> > mydata$trt<-ifelse(mydata$diet=="C" && mydata$vesl=="A", "CA",
> + ifelse(mydata$diet=="C" && mydata$vesl=="P", "CP",
> + ifelse(mydata$diet=="T" && mydata$vesl=="A", "TA",
> + ifelse(mydata$diet=="T" && mydata$vesl=="P", "TP"))))
> > mydata
> diet vesl trt
> 1 C A CA
> 2 C P CA
> 3 C A CA
> 4 C P CA
> 5 T A CA
> 6 T P CA
> 7 T A CA
> 8 T P CA
>
>
>
> Thank you very much
>
>
>
> Chunhao
>
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>
>
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