On Thu, 29 Oct 2009 10:21:23 -0700 (PDT) Guido van Steen <gvst...@yahoo.com> wrote: > I would like to transform this dataset into information on the > lenght of the first spell of unemployment. (If there are multiple > spells I would just like to use the first one.)
If 'dat' is your data frame (or matrix): l.sum=apply(dat,1,rle) f.length=function(x) x$lengths[match(4,x$values)] sapply(l.sum,f.length) The results is a vector of the lengths of the first run of '4' for each row (i.e., the first element corresponds to the first row, the second element to the second row, and so on). I very often find uses for the 'rle' function. It fast, it's fun, and it's great that it's part of base R. :-) -- Karl Ove Hufthammer ______________________________________________ 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.
