R question. Using lappy on a data.frame and creating new variables w/ output
I have 13 quantitative variables in a data.frame (called 'UNCA').
The variables are named q01_a, q01_b, ...q01_m.
I want to create 13 new variables that have the same values but are coded as a factor.
I would like to name these 13 new variables q01_a.F, q01_b.F, ...q01_m.F.
Any help would be greatly appreciat开发者_开发知识库ed!
for (i in names(UNCA)) {
UNCA[,paste(i,"F",sep='.')] <- as.factor(UNCA[,i])
}
this is not a beautiful solution but you can do by
d<-data.frame(matrix(sample(26),ncol=13))
names(d)<-paste("q01_",letters[1:13],sep="")
d2<-data.frame(lapply(d,factor))
# or if each variable should have common levels of factor:
# d2<-data.frame(lapply(d,factor, levels=sort(unique(unlist(d)))))
names(d2)<-paste(names(d),"F",sep=".")
d<-cbind(d,d2)
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