Oops, Bill's reply and mine crossed in the email. His is essentially the same as mine except probably more efficient.
-- Bert Bert Gunter "Data is not information. Information is not knowledge. And knowledge is certainly not wisdom." -- Clifford Stoll On Thu, Jul 23, 2015 at 2:44 PM, William Dunlap <wdun...@tibco.com> wrote: > You could do something like the following > > rowsToShiftLeft <- c(2,4,5) # 4, not the 3 that was in the original post > > mat <- as.matrix(df_start) > > mat[rowsToShiftLeft, 1:3] <- mat[rowsToShiftLeft, 2:4] > > result <- data.frame(mat[, 1:3], stringsAsFactors=FALSE) > > str(result) > 'data.frame': 5 obs. of 3 variables: > $ v0: chr "a" "b" "c" "d" ... > $ v1: chr "1" "2" "3" "4" ... > $ v2: chr "6" "7" "8" "9" ... > You will then have to convert the columns which ought to be numeric > to numeric. (All the columns in df_start were factors because of the > extra xxx that offset some of them.) > > > Bill Dunlap > TIBCO Software > wdunlap tibco.com > > On Thu, Jul 23, 2015 at 1:19 PM, maxbre <mbres...@arpa.veneto.it> wrote: > >> sorry but honestly I do not get your point >> >> I need to shift to left by one position (i.e. one column) the entire rows >> 2,4,5 of "df_start" so that to obtain as final result the structure >> indicated in "df_end" >> >> I know in advance the rows that I need to shift >> >> hope it clears a bit, now >> >> >> >> >> -- >> View this message in context: >> http://r.789695.n4.nabble.com/shift-by-one-column-given-rows-in-a-dataframe-tp4710256p4710276.html >> Sent from the R help mailing list archive at Nabble.com. >> >> ______________________________________________ >> 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. >> > > [[alternative HTML version deleted]] > > ______________________________________________ > 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.
