[R] how to split a data framed with sequences

[David Carslaw]

Hi all,

Given a data frame:

my.df <- data.frame(a = c(1:5, 1:10, 1:20), b = runif(35))

I want to split it by "a" such that I end up with a list containing 3
components i.e. the first containing a = 1 to 5, the second a = 1 to 10 etc.
In other words, sets of sequences of a.

I can't seem to find the right form using the split function - can you help? 

Much appreciated.

David



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Institute for Transport Studies
University of Leeds
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