On Sep 22, 2009, at 1:20 PM, FMH wrote:
Dear All,
Let ab is the combination of matrices a and b.
a <- matrix(c(1,2,3,4), nrow = 2, ncol = 2)
b <- matrix(c(4,3,1,2), nrow = 2, ncol = 2)
ab <- rbind(a, b)
From matrix ab, could someone give some advice on the way to sort
all elements in column 2, by the sequence of the elements in column
1 in ascending order?
ab[ ,2][ order(ab[,1]) ]
#[1] 3 4 2 1
Thank you.
Fir
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David Winsemius, MD
Heritage Laboratories
West Hartford, CT
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