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.
