nalluri pratap schreef: > Hi All, > > I have two variables X, Y. The question is "if the value of X is equal to > one, then the values in Y have to be reversed other wise it should not perfom > any action. I think this should be done using lapply function? > > Example > > Y values : 1 2 3 NA > X Y (ORIGINAL) Y (REVERSED) > 1 NA 1 > 0 ---- --- > 1 2 3 > 1 1 4 > 1 3 2 > ............... > > Can anyone provide solution to this? > > Thanks, > Pratap > > > > --------------------------------- > > [[alternative HTML version deleted]] > > ______________________________________________ > R-help@stat.math.ethz.ch 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. > Dear Pratap,
You could try something like this: x = c(1,0,1,1) y = c(1,2,3,NA) y_rev = rev(y) ifelse(x == 1, y_rev, y) hope this helps, Paul -- Drs. Paul Hiemstra Department of Physical Geography Faculty of Geosciences University of Utrecht Heidelberglaan 2 P.O. Box 80.115 3508 TC Utrecht Phone: +31302535773 Fax: +31302531145 http://intamap.geo.uu.nl/~paul ______________________________________________ R-help@stat.math.ethz.ch 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.
