[R] search functions for use on vector of ordered data
Jonathan Gabris
jonathan at k-m-p.nl
Thu Apr 28 11:11:33 CEST 2011
Hello,
I am looking for some search functions that deal with _ordered data_.
I suppose they already exist but I cannot find any reference of them.
Explanation:
I have a matrix, who's first column is ordered incrementally, with each
value unique and regularly spaced.
(timestamps of observations: number of miliseconds since begining).
I want to be able to find the the column index of the value X listed in
the matrix's first col.
The matrix is quite large, so the use of which(), or other similar
functions are not time efficient enough.
Thanks,
Regards,
Jonathan Gabris
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