Message-ID: <20050817190207.77099.qmail@web40508.mail.yahoo.com>
Date: 2005-08-17T19:02:07Z
From: Martin Lam
Subject: Copying rows from a matrix using a vector of indices
Hi,
I am trying to use a vector of indices to select some
rows from a matrix. But before I can do that I somehow
need to convert 'combinations' into a list, since
'mode(combinations)' says it's 'numerical'. Any idea
how I can do that?
library("combinat")
combinations <- t(combn(8,2))
indices <- c(sample(1:length(combinations),10))
# convert
???
subset <- combinations[indices]
Thanks in advance,
Martin