selecting ith rows of a matrix
Try this,
a = matrix(rnorm(10*10),ncol=10) a[, seq(1,ncol(a),by=2)]
baptiste
On 29 Apr 2009, at 09:28, Umesh Srinivasan wrote:
Hi all, If I have a huge matrix/ dataframe and I want to create a new matrix/ dataframe with every second (or third, or fourth etc.) row of the original matrix, how can I do it? Any help much appreciated. Thanks, Umesh [[alternative HTML version deleted]]
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_____________________________ Baptiste Augui? School of Physics University of Exeter Stocker Road, Exeter, Devon, EX4 4QL, UK Phone: +44 1392 264187 http://newton.ex.ac.uk/research/emag