It might help if you say what exactly you are struggling with. Even better would be to provide code and data using dput() (just for the data -- copy and paste the code).
If you can write a function to do whatever it is use need on a single year, then tapply() will be useful for splitting by year, running your function individually by year, and reaggregating the data. The plyr package might also be useful in that respect. Michael On Fri, Jan 27, 2012 at 2:20 PM, Jeremy Goss <jeremyg...@gmail.com> wrote: > I am working on directed network data of the following form: > > > Origin farm Destination farm Year > > Farm 1 -> Farm 2 1999 > Farm 1 -> Farm 3 1999 > Farm 3 -> Farm 2 2000 > Farm 1 -> Farm 2 2000 > > > I am using the package 'igraph' and I would like to generate and plot > (as a function of time) basic annual network statistics (degree, > diameter, density) without having to subset for each year. I have a > feeling that I can do this with either the 'loop' or 'apply' function > but am battling with the coding. Help would be appreciated! > > Thanks > > ______________________________________________ > 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.
