Re: vector dot multiply

[Pierre Weis <weis@pauillac.inria.fr>]

> Hi,
>  What would be 1). elegant
>                2). efficient  
>  way to write a "dot multiply" function in caml-light? 

You're recursive version seems good (except that you (re)compute
the vect_length of vector a at each recursive call). You may prefer an
imperative version (as yours, this function assumes a and b to have the
same length):

let dot a b =
  let s = ref 0.0 in
  for i = 0 to vect_length a - 1 do
   s := a.(i) *. b.(i) +. !s
  done;
  !s;;

> Also, is there a similar construct to Haskell array/list comprehensions?

No. This is very difficult to get in a strict language, where these
lists cannot be computed as necessary as is done in lazy languages...

Pierre Weis
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