On 16/10/2012 1:46 PM, Sam Steingold wrote:
> * Duncan Murdoch <zheqbpu.qha...@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)...
It was more or less instantaneous on the examples you posted. It would
be a bit more honest to say "it was fast on the examples, but it was
very slow when I ran it on my real data, which consists of
100000000000000 cases."
Duncan Murdoch
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