X-Git-Url: http://matita.cs.unibo.it/gitweb/?a=blobdiff_plain;ds=sidebyside;f=helm%2Focaml%2Fmathql_interpreter%2Fintersect.ml;h=73bebaa507c2300f5bd90dcc4c5001d887744eae;hb=6cd9c31edf69f619789a9802e840fbb61f4b6b40;hp=6503a39423579eab467ab080e2a45eef1d4dbfc4;hpb=5953b6e29b26a296d18dee9d453cec1255d65c1c;p=helm.git

diff --git a/helm/ocaml/mathql_interpreter/intersect.ml b/helm/ocaml/mathql_interpreter/intersect.ml
index 6503a3942..73bebaa50 100644
--- a/helm/ocaml/mathql_interpreter/intersect.ml
+++ b/helm/ocaml/mathql_interpreter/intersect.ml
@@ -41,6 +41,7 @@ let rec sum_groups(gr1, gr2) =
   match gr1, gr2 with
      [],_ -> gr2
    | _,[] -> gr1
+   | gr1, gr2 when gr1 = gr2 -> gr1
    | (key1,l1)::tl1, (key2,l2)::_ when key1 < key2 -> (key1,l1)::(sum_groups (tl1,gr2))
    | (key1,l1)::_, (key2,l2)::tl2 when key2 < key1 -> (key2,l2)::(sum_groups (gr1,tl2))
    | (key1,l1)::tl1, (key2,l2)::tl2 -> (key1,(append (l1,l2)))::(sum_groups (tl1,tl2))
@@ -48,7 +49,7 @@ let rec sum_groups(gr1, gr2) =
 ;;
 
 (* Product between an attribute set and a group of attributes *)
-let rec sub_prod (aset, gr) =           (*prende un aset e un gr e fa la somma tra tutti i gruppi di aset e gr *)
+let rec sub_prod (aset, gr) = (*prende un aset e un gr, fa la somma tra tutti i gruppi di aset e gr*)
   match aset with
       [] -> []
     | gr1::tl1 -> sum_groups (gr1, gr)::(sub_prod(tl1, gr)) 
@@ -58,34 +59,17 @@ let rec sub_prod (aset, gr) =           (*prende un aset e un gr e fa la somma t
 (* Cartesian product between two attribute sets*)
 let rec prod (as1, as2) =
   match as1, as2 with
-    [],_ -> as2
-  | _,[] -> as1
-  | gr1::tl1, _ -> (sub_prod (as2, gr1))@(prod (tl1, as2))  (* chiamo la sub_prod con un el. as1 e as2 *)
+    [],_ -> []   
+  | _,[] -> []   
+  | gr1::tl1, _ -> append((sub_prod (as2, gr1)), (prod (tl1, as2)))  (* chiamo la sub_prod con un el. as1 e as2 *)
 ;;
 
 (* Intersection between two resource sets, preserves order and gets rid of duplicates *)
-let intersect_ex rs1 rs2 =
-  let rec intersect_aux rs1 rs2 =
-    match (rs1, rs2) with
-       [],_
-     | _,[] -> []
-     | (uri1,_)::tl1,
-       (uri2,_)::_ when uri1 < uri2 -> intersect_aux tl1 rs2
-     | (uri1,_)::_,
-       (uri2,_)::tl2 when uri2 < uri1 -> intersect_aux rs1 tl2
-     | (uri1,as1)::tl1,
-       (uri2,as2)::tl2 -> (uri1, prod(as1,as2))::intersect_aux tl1 tl2 
-  in
-  let before = Sys.time () in
-  let res = intersect_aux rs1 rs2 in
-  let after = Sys.time () in
-  let ll1 = string_of_int (List.length rs1) in
-  let ll2 = string_of_int (List.length rs2) in
-  let diff = string_of_float (after -. before) in
-  print_endline
-   ("INTERSECT(" ^ ll1 ^ "," ^ ll2 ^ ") = " ^ string_of_int (List.length res) ^
-    ": " ^ diff ^ "s") ;
-  flush stdout ;
-  res
+let rec intersect_ex rs1 rs2 =
+  match (rs1, rs2) with
+    [],_
+  | _,[] -> []
+  | (uri1,_)::tl1, (uri2,_)::_ when uri1 < uri2 -> intersect_ex tl1 rs2
+  | (uri1,_)::_, (uri2,_)::tl2 when uri2 < uri1 -> intersect_ex rs1 tl2
+  | (uri1,as1)::tl1, (uri2,as2)::tl2 -> (uri1, prod(as1,as2))::intersect_ex tl1 tl2 
 ;;
-