Hi Luigi, It looks to me as though you will have to copy the data frame or store the output in a new data frame.
Jim On Mon, Aug 9, 2021 at 6:26 PM Luigi Marongiu <marongiu.lu...@gmail.com> wrote: > > Hello, > I would like to recursively select the columns of a dataframe by > strong the names of the dataframe in a vector and extracting one > element of the vector at a time. This I can do with, for instance: > ``` > vect = names(df) > sub_df[vect[1]] > ``` > > The problem is that I would like also to change the values of the > selected column using some logic as in `df$column[df$column == value] > <- new.value`, but I am confused on the syntax for the vectorized > version. Specifically, this does not work: > ``` > sub_df[vect[1] == 0] = "No" > ``` > What would be the correct approach? > Thank you > > ______________________________________________ > 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. ______________________________________________ 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.
