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faster tanimoto implementation #41

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13 changes: 7 additions & 6 deletions bitv.ml
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Original file line number Diff line number Diff line change
Expand Up @@ -565,12 +565,13 @@ module L = S(struct let least_first = true end)
module M = S(struct let least_first = false end)

let tanimoto v1 v2 =
let l = v1.length in
if l <> v2.length then invalid_arg "Bitv.tanimoto";
let a = pop v1 in
let b = pop v2 in
let c = pop (bw_and v1 v2) in
(float c) /. (float (a + b - c))
if v1.length <> v2.length then invalid_arg "Bitv.tanimoto";
let u_card = pop (bw_or v1 v2) in
if u_card = 0 then
0.0
else
(* |A n B| / |A u B| *)
(float (pop (bw_and v1 v2))) /. (float u_card)

(* Input/output in a machine-independent format. *)

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