Re: [R] Random Integers
Is there an R function to generate random integers? Thanks in advance. For example, if you want 5 random integers from the sequence 1:50, you can do the following: sample(1:50,5) Paul __ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
Re: [R] Random Integers
On 25 Feb 2007, at 06:51, Anup Nandialath wrote: Is there an R function to generate random integers? Thanks in advance. The package Random does what you want, but requires a net connection. http://cran.r-project.org/src/contrib/Descriptions/random.html This package provides an interface to the true random number service provided by the random.org website created by Mads Haahr. The random.org web service samples atmospheric noise via radio tuned to an unused broadcasting frequency together with a skew correction algorithm due to John von Neumann. install.packages(random) library(random) ?random randomNumbers(10,1,6,1) V1 1 5 2 3 3 6 4 3 5 3 6 1 7 6 8 4 9 5 10 3 Andy -- Andy Fugard, Postgraduate Research Student Psychology (Room F15), The University of Edinburgh, 7 George Square, Edinburgh EH8 9JZ, UK Mobile: +44 (0)78 123 87190 http://www.possibly.me.uk __ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
Re: [R] Random Integers
Sure. rpois(n, lambda) ... will do it. But you should tell us something about how you want your numbers to be distributed, since rpois() produces integers having a Poisson distribution. Charles Annis, P.E. [EMAIL PROTECTED] phone: 561-352-9699 eFax: 614-455-3265 http://www.StatisticalEngineering.com -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Anup Nandialath Sent: Sunday, February 25, 2007 1:51 AM To: r-help@stat.math.ethz.ch Subject: [R] Random Integers Hi all, Is there an R function to generate random integers? Thanks in advance. Sincerely Anup - Now that's room service! Choose from over 150,000 hotels [[alternative HTML version deleted]] __ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code. __ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
Re: [R] Random Integers
Charles Annis, P.E. wrote: rpois(n, lambda) ... will do it. But you should tell us something about how you want your numbers to be distributed, since rpois() produces integers having a Poisson distribution. nitpick rpois does not generate random _integers_, it generates random _natural numbers_. /nitpick The question should be more descriptive. Random is half of the things we need to know, the other half is how deterministic you want your integers. For example, if you want to generate random integers in such a way that all integers have the same probability, then this can't be done. OTOH, if you want to simulate random integers that distribute like integers appear in Nature, then it's still not precise, but there are serious attempts to reproduce this behaviour. Check in the wikipedia (www.wikipedia.org) those distributions: Zip's law, Zeta distribution, Benford's law, Zipf-Mandelbrot law. The problem is that all of them generate positive random integers, but it's not difficult to extrapolate them to integers. Alberto Monteiro __ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
Re: [R] Random Integers
Thanks Andy, Alberto, Charles, Paul and Pierre. I needed to simulate a set of counts to test a poisson regression model. Therefore would the best option be as pointed use rpois(.,.)? Sincerely Anup - [[alternative HTML version deleted]] __ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
