Dear R-devel list members,
Probably not an opportune time for this, given the immanent release of
2.0.0, but I was just reminded (while preparing a lecture) of a function
that I find useful and that I though might be a candidate for the utils
package: The function, which I call some(), behaves like head() and tail(),
from which it is adapted, except that it samples from an object (e.g., rows
of a data frame).
I like to use some() to get a quick look at data. Perhaps there's some other
already existing function that I'm not aware of that does the same thing.
Regards,
John
-------------- snip ---------------------
# adapted from head() and tail()
some <- function(x, ...) UseMethod("some")
some.default <- function(x, n=10, ...){
len <- length(x)
ans <- x[sort(sample(len, min(n, len)))]
if (length(dim(x)) == 1)
array(ans, n, list(names(ans)))
else ans
}
some.matrix <- function(x, n=10, ...){
nr <- nrow(x)
x[sort(sample(nr, min(n, nr))), , drop = FALSE]
}
some.data.frame <- function(x, n=10, ...){
nr <- nrow(x)
x[sort(sample(nr, min(n, nr))), , drop=FALSE]
}
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