Is there a module that implements an efficient array type in Erlang?

Posted by dsmith on Stack Overflow See other posts from Stack Overflow or by dsmith
Published on 2012-09-12T19:35:33Z Indexed on 2012/09/12 21:38 UTC
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data-structures

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erlang

I have been looking for an array type with the following characteristics in Erlang.

append(vector(), term())        O(1) 
nth(Idx, vector())              O(1)
set(Idx, vector(), term())      O(1)
insert(Idx, vector(), term())   O(N)
remove(Idx, vector())           O(N)

I normally use a tuple for this purpose, but the performance characteristics are not what I would want for large N. My testing shows the following performance characteristics...

erlang:append_element/2          O(N).
erlang:setelement/3              O(N).

I have started on a module based on the clojure.lang.PersistentVector implementation, but if it's already been done I won't reinvent the wheel.

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