Dear Shubha, > May be a trivial question, but struggling to find a solution... > > v=data.frame(a=c("1,234","2,345","5,567")) > >> v > > a > 1 1,234 > 2 2,345 > 3 5,567 > > I need a column 'b', which is just the addition of column 'a' with 5. > How do I do it? And, entries in column 'a' are with commas, always. > Also, class(v$a)=factor.
if you are working (as me) in a locale where the comma is the decimal separator, you should be awared that R is *very* good to cope with this nightmare: ### a <- c("1,234", "2,345", "5,567") v <- read.table(textConnection(a), col.names = "a", dec = ",") v$b <- v$a + 5 v ### a b 1 1.234 6.234 2 2.345 7.345 3 5.567 10.567 Have a look at the "dec" argument in ?read.table. See also ?format. Wonderful R, isn't it? Best, -- Jean R. Lobry ([EMAIL PROTECTED]) Laboratoire BBE-CNRS-UMR-5558, Univ. C. Bernard - LYON I, 43 Bd 11/11/1918, F-69622 VILLEURBANNE CEDEX, FRANCE allo : +33 472 43 27 56 fax : +33 472 43 13 88 http://pbil.univ-lyon1.fr/members/lobry/ ______________________________________________ R-help@r-project.org mailing list 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.