[R] generating RANDOM ROWS from matrix

[Berton Gunter]

?sample

You must use replace=FALSE to guarantee 1000 different rows

mymatrix[sample(12000,1000,replace=FALSE),]

-- Bert Gunter
Genentech Non-Clinical Statistics
South San Francisco, CA
 
"The business of the statistician is to catalyze the scientific learning
process."  - George E. P. Box
 
 

> -----Original Message-----
> From: r-help-bounces at stat.math.ethz.ch 
> [mailto:r-help-bounces at stat.math.ethz.ch] On Behalf Of mark salsburg
> Sent: Wednesday, March 15, 2006 1:02 PM
> To: R-help at stat.math.ethz.ch
> Subject: [R] generating RANDOM ROWS from matrix
> 
> Dear group,
> 
> I would like to generate a 1000 random rows from a MATRIX 
> with dimensions
> 12,000 by 20 (i.e. to generate a 1000 by 20 matrix of random rows)
> 
> Does the function sample() work for this???
> 
> thank you in advance
> 
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> 
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