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This is faster version of ave. window_fun applies function to every subset of x and return vector of the same length as x.

window_fun

x

window_fun(x, ...)

vector of the same length as x

A vector

Grouping variables all of the same length as x or length 1 and function as last argument.

window_fun(1:3, mean) # no grouping -> grand mean attach(warpbreaks) window_fun(breaks, wool, mean) window_fun(breaks, tension, function(x) mean(x, trim = 0.1)) detach(warpbreaks)

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