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Alex Rivera
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Something like sliding = function(df, n, f) ldply(1:(nrow(df) - n + 1), function(k) f(df[k:(k + n - 1), ]) ) That would be used like > df n a 1 1 0.8021891 2 2 0.9446330 ... > sliding(df, 2, function(df) with(df, + data.frame(n = n[1], a = a[1], b = sum(n - a)) + )) n a b 1 1 0.8021891 1.253178 ... Except straight inside ddply , so that I could get the nice syntactic sugar that comes with it?
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