R help - Apr 2006 - permutation of rows of a matrix

How can I generate a random permutation between rows of a matrix M (of m rows 
and n columns)?

Thanks for your help,

Jose

javargas wrote:
> How can I generate a random permutation between rows of a matrix M (of m
rows
> and n columns)?
maybe

M[ sample(1:m), ]

-- 
Ram?n Casero Ca?as

http://www.robots.ox.ac.uk/~rcasero/wiki
http://www.robots.ox.ac.uk/~rcasero/blog

Dear Jose,

M[sample(m, m),] will randomly permute the rows of M. [You probably could
have figured this out via help.search("permutation"), which would have
led
you to sample().]

Regards,
 John

--------------------------------
John Fox
Department of Sociology
McMaster University
Hamilton, Ontario
Canada L8S 4M4
905-525-9140x23604
http://socserv.mcmaster.ca/jfox 
-------------------------------- 
> -----Original Message-----
> From: r-help-bounces at stat.math.ethz.ch 
> [mailto:r-help-bounces at stat.math.ethz.ch] On Behalf Of javargas
> Sent: Saturday, April 15, 2006 7:53 AM
> To: r-help at stat.math.ethz.ch
> Subject: [R] permutation of rows of a matrix
> 
> How can I generate a random permutation between rows of a 
> matrix M (of m rows and n columns)?
> 
> Thanks for your help,
> 
> Jose
> 
> ______________________________________________
> R-help at 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

help(sample) does not say anything about randomly permuting the rows of 
a matrix M by using M[sample(m,m),]. Perhaps it could be added as an 
example of use.

John Fox wrote:
> Dear Jose,
> 
> M[sample(m, m),] will randomly permute the rows of M. [You probably could
> have figured this out via help.search("permutation"), which would
have led
> you to sample().]
> 
> Regards,
>  John
> 
> --------------------------------
> John Fox
> Department of Sociology
> McMaster University
> Hamilton, Ontario
> Canada L8S 4M4
> 905-525-9140x23604
> http://socserv.mcmaster.ca/jfox 
> -------------------------------- 
> 
> 
>>-----Original Message-----
>>From: r-help-bounces at stat.math.ethz.ch 
>>[mailto:r-help-bounces at stat.math.ethz.ch] On Behalf Of javargas
>>Sent: Saturday, April 15, 2006 7:53 AM
>>To: r-help at stat.math.ethz.ch
>>Subject: [R] permutation of rows of a matrix
>>
>>How can I generate a random permutation between rows of a 
>>matrix M (of m rows and n columns)?
>>
>>Thanks for your help,
>>
>>Jose
>>
>>______________________________________________
>>R-help at 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
> 
> 
> ______________________________________________
> R-help at 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
> 
		
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