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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