On Thu, 2005-12-22 at 16:58 +0100, Albert Vilella wrote: > Hi all, > > I would like to factorize the entries in a dataframe given some > groupings. E.g: > > mydf = data.frame( > a = rnorm(100,10), > b = rnorm(100,10), > c = rgamma(100, 1, scale=1)) > > group = hist(mydf$c, breaks="FD") > group$breaks > > The idea is to create a factor "mydf$d" with levels corresponding to > the ranges in group$breaks. > > There must be an easy way to do this that I haven't found out. > > Thanks in advance, > > Albert.
See ?cut Then: myfac.c <- cut(mydf$c, breaks = group$breaks) Take note of the additional arguments in cut() relative to the nature of the interval cutpoints (ie. 'right' and 'include.lowest'). 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
