On Oct 15, 2009, at 10:19 AM, Marcio Resende wrote:
I would like to divide a vector in 9 groups in a way that each
number is
present in only one group.
In a vector of 783 I would like to divide in 9 different groups of 87
Example <- matrix(c(1:783),ncol = 1)
> Example <- matrix(c(1:783),ncol = 1)
> Grp1 <- sample(Example, 87, replace=FALSE)
> Grp2 <- sample(Example[-Grp1], 87, replace=FALSE)
> Grp3 <- sample(Example[-c(Grp1, Grp2)], 87, replace=FALSE)
# lather, rinse , repeat
s1 <- as.matrix(sample(Example,87, re = FALSE))
Example <- Example[-s1]
s2 <- as.matrix(sample(Example,87, re = FALSE))
#however I don´t know how to remove the second group from the
"Example" to
continue sampling.
#Don't mess up the original
There is probably an easy and faster way to do this.
Could anybody help me?
Thanks
--
David Winsemius, MD
Heritage Laboratories
West Hartford, CT
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