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

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