Dear zerftezen,
Try this:

# Data
set.seed(123)
X=as.data.frame(matrix(rnorm(100),ncol=10))

# Percentiles 10 and 90 using apply
t(apply(X,2,quantile,probs=c(0.1,0.9)))

# The same using sapply
t(sapply(X,function(x) quantile(x,probs=c(0.1,0.9))))


HTH,

Jorge



On Mon, Nov 3, 2008 at 10:03 AM, zerfetzen <zerfetzen@yahoo.com> wrote:

>
> I want to apply a more complicated function than what I use in my example,
> but the idea is the same:
>
> Suppose you have a data frame named x and you want to a function applied to
> each variable, we'll just use the quantile function for this example.  I'm
> trying all sorts of apply functions, but not having luck.  My best guess
> would be:
>
> sapply(x, FUN=quantile)
> --
> View this message in context:
> http://www.nabble.com/How-do-you-apply-a-function-to-each-variable-in-a-data-frame--tp20304332p20304332.html
> Sent from the R help mailing list archive at Nabble.com.
>
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