Re: [R] How do you test for "consecutivity"?

From: Charles Annis, P.E. <Charles.Annis_at_statisticalengineering.com>
Date: Tue, 29 Apr 2008 12:14:25 -0400

This will work:

my.list <- c(2, 28, 31, 4, 27)
sort(my.list)
diff(sort(my.list))
any(diff(sort(my.list)) == 1)

the middle two lines are only to illustrate what's going on.

Best wishes!

Charles Annis, P.E.

Charles.Annis_at_StatisticalEngineering.com phone: 561-352-9699
eFax: 614-455-3265
http://www.StatisticalEngineering.com  

-----Original Message-----
From: r-help-bounces_at_r-project.org [mailto:r-help-bounces_at_r-project.org] On Behalf Of Anthony28
Sent: Tuesday, April 29, 2008 8:52 AM
To: r-help_at_r-project.org
Subject: [R] How do you test for "consecutivity"?

I need to use R to model a large number of experiments (say, 1000). Each experiment involves the random selection of 5 numbers (without replacement) from a pool of numbers ranging between 1 and 30.

What I need to know is what *proportion* of those experiments contains two or more numbers that are consecutive. So, for instance, an experiment that yielded the numbers 2, 28, 31, 4, 27 would be considered a "consecutive = true" experiment since 28 and 27 are two consecutive numbers, even though they are not side-by-side.

I am quite new to R, so really am puzzled as to how to go about this. I've tried sorting each experiment, and then subtracting adjacent pairs of numbers to see if the difference is plus or minus 1. I'm also unsure about whether to use an array to store all the data first.

Any assistance would be much appreciated.

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