On 2010-04-01 3:53, Ken Knoblauch wrote:
Kenneth Roy Cabrera Torres<krcabrer<at> une.net.co> writes:Hi R users: I found that I cannot stack() a data.frame with factors. db1<-data.frame(replicate(6,factor(sample(c("A","B"),6,replace=TRUE)))) str(db1) db2<-stack(db1) db2 "db2" does not have any row. How can I stack them by the variables X1,X2,...,X6?you can see what is happening in stack.data.frame you have a line x<- x[, unlist(lapply(x, is.vector)), drop = FALSE] and lapply(x, is.vector)) is applied to each column of the data frame but you can verify for yourself that a factor yields FALSE here x<- db1[[1]] is.vector(x) [1] FALSE so I think that this at least explains why it doesn't work as you expected.
db2 <- stack(lapply(db1, as.character)) will do it. -Peter Ehlers
Thank you for your help. Kenneth
-- Peter Ehlers University of Calgary ______________________________________________ R-help@r-project.org mailing list 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.
