Hi [EMAIL PROTECTED] napsal dne 11.11.2008 06:59:55:
> > Hi all > > I am manipulating a datafram which has 3 variables.Such as: > > 1 2 3 > 4 5 6 > . > . > . > 200 210 300 > > I also has a row index: index=c(100,200,250..300) > I want to find the sums of first 100 rows, then the sum from row 101 to row > 200, then row 201 to row 250... the each end row is indicated by the index. A little bit vague question, hence vague answer. make a factor which has 3 values repeated 100 times (rep) and then use almost any of aggregation function ( e.g. tapply, by, aggregate) with sum function. Regards Petr > > Can I use the apply function to do that? or any other way? > > Thanks > > Ted > > > -- > View this message in context: http://www.nabble.com/Apply-function- > tp20434042p20434042.html > Sent from the R help mailing list archive at Nabble.com. > > ______________________________________________ > 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. ______________________________________________ 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.
