[R] search functions for use on vector of ordered data

From: Jonathan Gabris <jonathan_at_k-m-p.nl>
Date: Thu, 28 Apr 2011 11:11:33 +0200


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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