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An optimised version of split for the special case of splitting row indices into groups.
split_indices(group, n = 0L)
A list of vectors of indices.
Integer indices
The largest integer (may not appear in index). This is hint: if the largest value of group is bigger than n, the output will silently expand.
group
n
https://github.com/hadley/plyr/blob/d57f9377eb5d56107ba3136775f2f0f005f33aa3/src/split-numeric.cpp#L20
split_indices(sample(10, 100, rep = TRUE)) split_indices(sample(10, 100, rep = TRUE), 10)
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