i study the code of function ave,but i can understand one line of the syntax.
> ave
function (x, ..., FUN = mean)
{
n <- length(list(...))
if (n) {
g <- interaction(...)
split(x, g) <- lapply(split(x, g), FUN)
}
else x[] <- FUN(x)
x
}
my question is : what does "split(x, g) <- lapply(split(x, g), FUN)" mean?
thank you!
--
Department of Sociology
Fudan University,Shanghai
Blog:http://sociology.yculblog.com
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