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Code Releases Activity

Fixed overflow in Boys

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This commit is contained in:
Anthony Scemama 2020-03-27 17:58:50 +01:00
parent 4269327046
commit e7aa4c6ac7
2 changed files with 11 additions and 11 deletions
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2
Notebooks/SpVec.ipynb
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@ -1746,7 +1746,7 @@
"metadata": {
"celltoolbar": "Raw Cell Format",
"kernelspec": {
"display_name": "OCaml 4.07.1",
"display_name": "OCaml default",
"language": "OCaml",
"name": "ocaml-jupyter"
},

20
Utils/Util.ml
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@ -209,29 +209,29 @@ let boys_function ~maxm t =
let result =
Array.init (maxm+1) (fun m -> 1. /. float_of_int (2*m+1))
in
(*
assert (abs_float t > 1.e-10);
*)
if t <> 0. then
begin
let power_t_inv = (maxm+maxm+1) in
try
let fmax =
let t_inv = sqrt (1. /. t) in
let n = float_of_int maxm in
let dm = 0.5 +. n in
let f = (pow t_inv (maxm+maxm+1) ) in
let f = (pow t_inv power_t_inv ) in
match classify_float f with
| FP_normal -> (incomplete_gamma dm t) *. 0.5 *. f
| FP_zero
| FP_subnormal -> 0.
| _ -> invalid_arg "zero_m overflow"
| _ ->
Printf.eprintf "t=%e\n" t;
Printf.eprintf "maxm=%d\n" maxm;
raise Exit
in
let emt = exp (-. t) in
result.(maxm) <- fmax;
for n=maxm-1 downto 0 do
result.(n) <- ( (t+.t) *. result.(n+1) +. emt) *. result.(n)
done
end;
result
done;
result
with Exit -> result
end