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Gnmp.ml
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Gnmp.ml
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let gnmp n m p =
let features = Array.make n IntSet.empty in
for v = 0 to n - 1 do
for f = 0 to m - 1 do
if Random.float 1.0 <= p
then features.(v) <- IntSet.add features.(v) f
done
done;
let g = ref Graph.empty in
for v = 0 to n - 1 do
for w = v + 1 to n - 1 do
if IntSet.do_intersect features.(v) features.(w)
then g := Graph.connect !g v w
done
done;
features, !g
;;
let () =
if Array.length Sys.argv < 4 || Array.length Sys.argv > 5
then begin
Printf.eprintf "usage: %s n m edges [rand-seed]\n" Sys.argv.(0);
exit 1;
end;
let n = int_of_string Sys.argv.(1) in
let m = int_of_string Sys.argv.(2) in
let edges = int_of_string Sys.argv.(3) in
if Array.length Sys.argv = 5
then Random.init (int_of_string Sys.argv.(4))
else Random.self_init ();
let features, g, p =
let rec loop p delta =
let features, g = gnmp n m p in
let edges' = Graph.num_edges g in
if delta < 1e-16 || (float_of_int (abs (edges' - edges))) /. (float_of_int edges) < 0.01
then features, g, p
else if edges' > edges
then loop (p -. delta) (0.75 *. delta)
else loop (p +. delta) (0.75 *. delta)
in
loop 0.5 0.25
in
Printf.printf "# n = %d\n# m = %d\n# p = %f\n" n m p;
let features, g = gnmp n m p in
for f = 0 to m - 1 do
Printf.printf "# %d:" f;
for v = 0 to n - 1 do
if IntSet.contains features.(v) f
then Printf.printf " %d" v
done;
print_newline ();
done;
Graph.iter_edges (fun i j -> Printf.printf "%d %d\n" i j) g
;;