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135476
2010 Jun 22
1
how to efficiently compute set unique?
...rom 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?
dim(cntxtn)
[1] 13584763 1
uniqueCntxt = unique(cntxtn); # this is taking really long
Please advice.
Thanks,
Gang