On Thu, Dec 30, 2010 at 4:01 AM, Andreas Kostler
<[email protected]> wrote:
> Oh of course. I apologise. Mark do you mind to lay out how you perform your
> benchmarks.
> On my system (insertion-sort (into [] (range 10000))) runs for an
> unacceptable amount of time (talking ~10s)
> That seems to be quite long for sorting an already sorted vector of 10k
> elements.
Maybe you're still using your original version with the good insert,
but the bad sort?
Try this:
(defn insert-into [sorted-vec element]
(loop [i (count sorted-vec)]
(if (and (> i 0) (> (nth sorted-vec (dec i)) element))
(recur (dec i))
(into (conj (subvec sorted-vec 0 i) element) (subvec
sorted-vec i)))))
(defn insertion-sort [s]
(reduce insert-into [] s))
(time (last (insertion-sort (range 10000))))
I get 30ms.
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