R help - Feb 2009 - subsetting a matrix based on condition

Dear All,

I have matrix of size 2500 x 12. I would like to select all the rows if 6 out 12
values are > 0. How can I do that in R?

Thanks in advance.

Kind regards,
Ezhil

one way is:

mat <- matrix(rnorm(2500*12), 2500, 12)

ind <- rowSums(mat > 0) > 6
mat[ind, ]


I hope it helps.

Best,
Dimitris


A Ezhil wrote:
> Dear All,
> 
> I have matrix of size 2500 x 12. I would like to select all the rows if 6
out 12 values are > 0. How can I do that in R?
> 
> Thanks in advance.
> 
> Kind regards,
> Ezhil
> 
> ______________________________________________
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> PLEASE do read the posting guide
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> 
-- 
Dimitris Rizopoulos
Assistant Professor
Department of Biostatistics
Erasmus University Medical Center

Address: PO Box 2040, 3000 CA Rotterdam, the Netherlands
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