> On 24 Oct 2017, at 22:45 , David L Carlson <dcarl...@tamu.edu> wrote: > > You left out all the most important bits of information. What is yo? Are you > trying to assign a data frame to a single column in another data frame? > Printing head(samples) tells us nothing about what data types you have, > especially if the things that look like text are really factors that were > created when you used one of the read.*() functions. Use str(samples) to see > what you are dealing with.
Actually, I think there is enough information to diagnose this. The main issue is as you point out, assignment of an entire data frame to a column of another data frame: > l <- letters[1:5] > s <- as.data.frame(sapply(l,toupper)) > dput(s) structure(list(`sapply(l, toupper)` = structure(1:5, .Label = c("A", "B", "C", "D", "E"), class = "factor")), .Names = "sapply(l, toupper)", row.names = c("a", "b", "c", "d", "e"), class = "data.frame") (incidentally, setting col.names has no effect on this; notice that it is only documented as an argument to "list" and "matrix" methods, and sapply() returns a vector) Now, if we do this: > dd <- data.frame(A=l) > dd$B <- s we end up with a data frame whose B "column" is another data frame > dput(dd) structure(list(A = structure(1:5, .Label = c("a", "b", "c", "d", "e"), class = "factor"), B = structure(list(`sapply(l, toupper)` = structure(1:5, .Label = c("A", "B", "C", "D", "E"), class = "factor")), .Names = "sapply(l, toupper)", row.names = c("a", "b", "c", "d", "e"), class = "data.frame")), .Names = c("A", "B"), row.names = c(NA, -5L), class = "data.frame") in printing such data frames, the inner frame "wins" the column names, which is sensible if you consider what would happen if it had more than one column: > dd A sapply(l, toupper) 1 a A 2 b B 3 c C 4 d D 5 e E To get the effect that Ed probably expected, do > dd <- data.frame(A=l) > dd["B"] <- s > dd A B 1 a A 2 b B 3 c C 4 d D 5 e E (and notice that single-bracket indexing is crucial here) -pd ______________________________________________ R-help@r-project.org 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.