WXE83 wrote:
Dear all,
I got one problem here and hoping someone can help me on this. Say I have a
50 by 2 matrix and I don't know how to randomly select:
data <- matrix(1:25, 50, 2)
1. a pair of observations from the last 10th of the 50 observation from the
matrix.
data[sample(41:50, 1, replace=FALSE),]
2. how to select randomly an observation from the first 5 observations of
the second column in the matrix?
data[sample(1:5, 1, replace=FALSE),2]
Ciao,
domenico
Thanks....hope to hear from someone soon
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