On Mon, 9 Aug 2021 13:16:02 +0200 Luigi Marongiu <marongiu.lu...@gmail.com> wrote:
> df = data.frame(VAR = ..., VAL = ...) > vect = letters[1:5] What is the relation between vect and the column names of the data frame? Is it your intention to choose rows or columns using `vect`? > df[df[['vect[2]']] == 2, 'vect[2]'] '...' creates a string literal. If you want to evaluate an R expression, don't wrap it in quotes. I had assumed you wanted to put column names in the vector `vect`, but now I'm just confused: `vect` is the same as df$VAR, not colnames(df). What do you want to achieve? Again, you can access the second column with much less typing by addressing it directly: df[[2]] Does it help if you consult [**] or some other tutorial on subsetting in R? -- Best regards, Ivan [**] https://cran.r-project.org/doc/manuals/r-release/R-intro.html#Index-vectors https://cran.r-project.org/doc/manuals/r-release/R-intro.html#Lists ______________________________________________ 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.
