On Wed, 2007-07-18 at 19:36 +0200, Ing. Michal Kneifl, Ph.D. wrote: > Hi, > I am also a quite new user of R and would like to ask you for help: > I have a data frame where all columns are numeric variables. My aim is > to convert one columnt in factors. > Example: > MD > 0.2 > 0.1 > 0.8 > 0.3 > 0.7 > 0.6 > 0.01 > 0.2 > 0.5 > 1 > 1 > > > I want to make classes: > 0-0.2 A > 0.21-0.4 B > 0.41-0.6 C > ..... and so on > > So after classification I wil get: > MD > A > A > D > B > . > . > . > and so on > > Please could you give an advice to a newbie? > Thanks a lot in advance.. > > Michael
See ?cut You can then do something like: > DF MD 1 0.20 2 0.10 3 0.80 4 0.30 5 0.70 6 0.60 7 0.01 8 0.20 9 0.50 10 1.00 11 1.00 > cut(DF$MD, breaks = c(seq(0, 1, .2)), labels = LETTERS[1:5]) [1] A A D B D C A A C E E Levels: A B C D E HTH, Marc Schwartz ______________________________________________ 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.