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(* ocamlgsl - OCaml interface to GSL *)
(* Copyright (©) 2002-2005 - Olivier Andrieu *)
(* distributed under the terms of the GPL version 2 *)
type t
type accel
type interp_type =
| LINEAR
| POLYNOMIAL
| CSPLINE
| CSPLINE_PERIODIC
| AKIMA
| AKIMA_PERIODIC
external _alloc : interp_type -> int -> t
= "ml_gsl_interp_alloc"
external _free : t -> unit
= "ml_gsl_interp_free"
let make t s =
let i = _alloc t s in
Gc.finalise _free i ;
i
external _init : t -> float array -> float array -> int -> unit
= "ml_gsl_interp_init"
let init i x y =
let lx = Array.length x in
let ly = Array.length y in
if lx <> ly
then invalid_arg "Gsl_interp: init" ;
_init i x y lx
external name : t -> string
= "ml_gsl_interp_name"
external min_size : t -> int
= "ml_gsl_interp_min_size"
external _accel_alloc : unit -> accel
= "ml_gsl_interp_accel_alloc"
external _accel_free : accel -> unit
= "ml_gsl_interp_accel_free"
let make_accel () =
let a = _accel_alloc () in
Gc.finalise _accel_free a ;
a
external i_eval : t -> float array -> float array
-> float -> accel -> float
= "ml_gsl_interp_eval"
external i_eval_deriv : t -> float array -> float array
-> float -> accel -> float
= "ml_gsl_interp_eval_deriv"
external i_eval_deriv2 : t -> float array -> float array
-> float -> accel -> float
= "ml_gsl_interp_eval_deriv2"
external i_eval_integ : t -> float array -> float array
-> float -> float -> accel -> float
= "ml_gsl_interp_eval_integ_bc" "ml_gsl_interp_eval_integ"
(* Higher level functions *)
type interp = {
interp : t ;
accel : accel ;
xa : float array ;
ya : float array ;
size : int ;
i_type : interp_type ;
}
let make_interp i_type x y =
let len = Array.length x in
let ly = Array.length y in
if len <> ly
then invalid_arg "Gsl_interp.make" ;
let t = _alloc i_type len in
let a = _accel_alloc () in
let v = { interp=t; accel = a ;
xa=x; ya=y; size=len; i_type=i_type } in
Gc.finalise (fun v -> _free v.interp ; _accel_free v.accel) v ;
init t x y ;
v
let eval interp x =
i_eval interp.interp interp.xa interp.ya x interp.accel
external eval_array : interp -> float array -> float array -> unit
= "ml_gsl_interp_eval_array"
let eval_deriv interp x =
i_eval_deriv interp.interp interp.xa interp.ya x interp.accel
let eval_deriv2 interp x =
i_eval_deriv2 interp.interp interp.xa interp.ya x interp.accel
let eval_integ interp a b =
i_eval_integ interp.interp interp.xa interp.ya a b interp.accel
|
