Re: [R] permutates and/or samples a matrix

From: Gabor Csardi <csardi_at_rmki.kfki.hu>
Date: Thu, 31 Jan 2008 14:32:20 +0100

What exactly is the question? Selecting/permuting rows?

M[sample(length=nrow(M), count), ]

Selecting/permuting columns?

M[ , sample(length=ncol(M), count) ]

Permuting elements?

structure(sample(M), dim=dim(M))

Selecting elements?

sample(M, count)

Gabor

On Thu, Jan 31, 2008 at 09:10:11PM +0800, Ng Stanley wrote:
> Hi,
>

> sample(x) only permutates and/or samples from a vector, which I can't use
> for a matrix. Please help.
>
> Thanks
> Stanley
>
> [[alternative HTML version deleted]]
>
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-- 
Csardi Gabor <csardi_at_rmki.kfki.hu>    UNIL DGM

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Received on Thu 31 Jan 2008 - 13:49:14 GMT

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