[R] grouping by consecutive integers

From: Kevin J Emerson <kemerson_at_uoregon.edu>
Date: Tue 25 Jul 2006 - 01:45:11 EST


Hello R-helpers!

I have a question concerning extracting sequence information from a vector. I have a vector (representing the bins of a time series where the frequency of occurrences is greater than some threshold) where I would like to extract the min, median and max of each group of consecutive numbers.

For Example:

tmp <- c(24,25,29,35,36,37,38,39,40,41,42,43,44,45,46,47,68,69,70,71)

I would like to have the max,min,median of the following groups:

24,25
29
35,36,37,38,39,40,41,42,43,44,45,46,47,
68,69,70,71

I would like to be able to perform this for many time series so an automated process would be nice. I am hoping to use this as a peak detection protocol.

Any advice would be greatly appreciated, Kevin




Kevin J Emerson
Center for Ecology and Evolutionary Biology 1210 University of Oregon
Eugene, OR 97403
USA

kemerson@uoregon.edu

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