On Nov 13, 2009, at 7:46 PM, Jorge Ivan Velez wrote:
Hi Rachel,
Here is a suggestion:
index <- sample(100)
mysample <- gly[index, ]
mysample
I doubt that was what he was hoping to get (which would be a
permutation of 1:100 rather than a subsample).
try:
samp <- gly[ sample(nrow(gly), 100), ]
--
David
See ?sample for more information.
HTH,
Jorge
On Fri, Nov 13, 2009 at 5:20 PM, Hayes, Rachel M <> wrote:
Hi All,
I want to take a simple random sample from a large dataset, gly,
but I'm
getting an error message. Any help?
dim(gly)
[1] 112371 37
s1 <- sample(gly,100)
Error in `[.data.frame`(x, .Internal(sample(length(x), size,
replace, :
cannot take a sample larger than the population when 'replace =
FALSE'
It is not a misleading error once you consider that the length of a
data.frame, which is what you handed to sample(), is the number of
columns rather than the number of rows. Data.frames are lists.
--
David Winsemius, MD
Heritage Laboratories
West Hartford, CT
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