On Thu, 2005-12-22 at 10:08 -0600, Marc Schwartz (via MN) wrote: > 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)
One quick update here which is more clearly based upon your comment above: mydf$d <- cut(mydf$c, breaks = group$breaks) Which will add the resultant factor as a new column 'd' to your existing mydf. Marc ______________________________________________ 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
