One oddity in transform that I recently noticed. It seems that to include a one-column data frame in the arguments one must name it even though the name is ignored. If the data frame has more than one column then it must also be named but in that case it is not ignored and the names are made up of a combination of that name and the data frame's names. I would have thought that if we did not want a combination of names we would just not name the argument.
# ignores second argument returning BOD unchanged transform(BOD, data.frame(y = 1:6)) |> names() ## [1] "Time" "demand" # ignores second argument returning BOD unchanged transform(BOD, data.frame(y = 1:6, z = 6:1)) |> names() ## [1] "Time" "demand" # with one column in data frame it adds the column and names it y ignoring x transform(BOD, x = data.frame(y = 1:6)) |> names() ## [1] "Time" "demand" "y" # with multiple columns in data frame it uses x.y and x.z as names transform(BOD, data.frame(y = 1:6, z = 6:1)) |> names() ## [1] "Time" "demand" "x.y" "x.z" -- Statistics & Software Consulting GKX Group, GKX Associates Inc. tel: 1-877-GKX-GROUP email: ggrothendieck at gmail.com ______________________________________________ R-devel@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-devel
