[R] uniq -c

[Sam Steingold]

> * Duncan Murdoch <zheqbpu.qhapna at tznvy.pbz> [2012-10-16 12:47:36 -0400]:
>
> On 16/10/2012 12:29 PM, Sam Steingold wrote:
>> x is sorted.
> sparseby(data=x, INDICES=x, FUN=nrow)

this takes forever; apparently, it does not use the fact that x is
sorted (even then - it should not take more than a few minutes)...

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