Hi, On Mon, Sep 7, 2009 at 11:46 AM, A Ezhil<ezhi...@yahoo.com> wrote: > Dear All, > > I have matrix (50000 X 60) of subjects and their responses to a set of > questions. All responses are classified into categories (500). I would like > to average all subject's responses for each category. I wrote a code using a > for loop but is not working. Could please tell me what's wrong with the code? > I guess, there is a elegant R way of doing the same thing.
The dlply function in the plyr library provides a very easy and intuitive way to do this ... if you're having problems using it, please post a small representative matrix of your data that we can paste into our own R session to slice and dice for you as an example. -steve -- Steve Lianoglou Graduate Student: Computational Systems Biology | Memorial Sloan-Kettering Cancer Center | Weill Medical College of Cornell University Contact Info: http://cbio.mskcc.org/~lianos/contact ______________________________________________ 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.
