Usage of OCaml/R binding.
Hello. Since nobody answered this on R-help@, I thought I'd push it through to R-devel at . By the way, here's the webpage (in french) for the Debian package of Maxence Guesdon's OCaml/R bindings: http://yziquel.homelinux.org/topos/debian-ocamlr.html http://yziquel.homelinux.org/debian/pool/main/o/ocaml-r/ Guillaume Yziquel a ?crit :
Hello.
I've been pulling together a Debian package out of Maxence Guesdon's
OCaml bindings for R. Will be available from my website as soon as I get
my router to obey me. Here's Maxence's bindings:
http://pauillac.inria.fr/~guesdon/ocaml-r.en.html
The purpose of this software is to access R from OCaml programs.
However, my issue is that after having pulled things to a Debian
package, I am completely unfamiliar with the API, and I'm having trouble
initialising this module.
You'll find below a list of the functions accessible from Maxence
Guesdon's R module (there's also a Rmath module for the math library
which I'm not yet concerned about).
I'd specifically appreciate information on how to get started using
these R API functions. If you're scared about OCaml, simply look at the
two declarations below in the following way:
external init_r : string array -> int = "init_r"
'external' means that this value is to be fetched by linking C code
identified by the '= "init_r"' ending statement. Typically, 'external'
values wrap the API functions. So this value is called init_r, and takes
an array of strings as first argument, and yields back an integer.
val init : ?argv:string array -> unit -> int
'val' means that it is a standard OCaml value. It's called init. And its
type is 'I take an array of strings as first argument, then a unit (
think of it a C void value containing nothing), and I get back an
integer. The '?argv:' stuff is concerned with optional arguments, so no
real big deal.
Documentation and examples of how the API works to embed R in an
application would be highly appreciated. Please forward this email to
R-dev if you feel it belongs there.
All the best,
Guillaume Yziquel.
yziquel at seldon:~/sandbox/repo/debian/debian-ocaml/ocaml-r$ ocaml-batteries Objective Caml version 3.11.1
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# #rectypes;;
# #require "R";;
# module X = R;;
module X :
sig
external init_r : string array -> int = "init_r"
val init : ?argv:string array -> unit -> int
external terminate : unit -> unit = "end_r"
type sexp = R.sexp
type symbol = string
type arg = [ `Anon of sexp | `Named of sexp * symbol ]
external sexp : string -> sexp = "r_sexp_of_string"
external sexp_of_symbol : symbol -> sexp = "r_sexp_of_symbol"
external set_var : symbol -> sexp -> unit = "r_set_var"
external r_print_value : sexp -> unit = "r_print_value"
external exec : string -> arg array -> unit = "r_exec"
external current_test : unit -> unit = "r_current_test"
external to_bool : sexp -> bool = "bool_of_sexp"
external to_int : sexp -> int = "int_of_sexp"
external to_float : sexp -> float = "float_of_sexp"
external to_string : sexp -> string = "string_of_sexp"
external of_bool : bool -> sexp = "sexp_of_bool"
external of_int : int -> sexp = "sexp_of_int"
external of_float : float -> sexp = "sexp_of_float"
external of_string : string -> sexp = "sexp_of_string"
external to_bool_array : sexp -> bool array = "bool_array_of_sexp"
external to_int_array : sexp -> int array = "int_array_of_sexp"
external to_float_array : sexp -> float array = "float_array_of_sexp"
external to_string_array : sexp -> string array =
"string_array_of_sexp"
external of_bool_array : bool array -> sexp = "sexp_of_bool_array"
external of_int_array : int array -> sexp = "sexp_of_int_array"
external of_float_array : float array -> sexp = "sexp_of_float_array"
external of_string_array : string array -> sexp =
"sexp_of_string_array"
external get_attrib : sexp -> string -> sexp = "r_get_attrib"
val dim : sexp -> int array
val dimnames : sexp -> string array
end
#
Guillaume Yziquel http://yziquel.homelinux.org/