[R] how to efficiently compute set unique?
fanggangsw at gmail.com
Tue Jun 22 03:06:58 CEST 2010
I want to get the unique set from a large numeric k by 1 vector, k is
in tens of millions
when I used the matlab function unique, it takes less than 10 secs
but when I tried to use the unique in R with similar CPU and memory,
it is not done in minutes
I am wondering, am I using the function in the right way?
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uniqueCntxt = unique(cntxtn); # this is taking really long
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