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open Ast
(*
--# Maximum value
--#
--# Returns the maximum value in a vector or list.
--#
--# @name max
--# @param x :: Vector | List The numeric data.
--# @param na_rm :: Bool Whether to remove NA values. Default is false.
--# @return :: Float The maximum value.
--# @example
--# max([1, 2, 3])
--# -- Returns = 3.0
--# @family stats
--# @seealso min
--# @export
*)
let register env =
Env.add "max"
(make_builtin_named ~name:"max" ~variadic:true 1 (fun named_args _env ->
match Math_common.get_bool_flag "na_rm" false named_args with
| Error e -> e
| Ok na_rm ->
let args = Math_common.positional_args_without ["na_rm"] named_args in
let find_max label items =
let max_val = ref Float.neg_infinity in
let has_values = ref false in
let had_error = ref None in
let process_value v =
if !had_error = None then
match v with
| VInt n ->
let f = float_of_int n in
if f > !max_val then max_val := f;
has_values := true
| VFloat f ->
if f > !max_val then max_val := f;
has_values := true
| VNA _ when na_rm -> ()
| VNA _ -> had_error := Some (Error.na_value_error ~na_rm:true label)
| _ -> had_error := Some (Error.type_error (Printf.sprintf "Function `%s` requires numeric values." label))
in
List.iter process_value items;
match !had_error with
| Some e -> e
| None -> if !has_values then VFloat !max_val else VNA NAFloat
in
let find_max_arr label arr =
let max_val = ref Float.neg_infinity in
let has_values = ref false in
let had_error = ref None in
for i = 0 to Array.length arr - 1 do
if !had_error = None then
match arr.(i) with
| VInt n ->
let f = float_of_int n in
if f > !max_val then max_val := f;
has_values := true
| VFloat f ->
if f > !max_val then max_val := f;
has_values := true
| VNA _ when na_rm -> ()
| VNA _ -> had_error := Some (Error.na_value_error ~na_rm:true label)
| _ -> had_error := Some (Error.type_error (Printf.sprintf "Function `%s` requires numeric values." label))
done;
match !had_error with
| Some e -> e
| None -> if !has_values then VFloat !max_val else VNA NAFloat
in
match args with
| [VList []] -> Error.value_error "Function `max` called on empty List."
| [VList items] -> find_max "max" (List.map snd items)
| [VVector arr] when Array.length arr = 0 -> Error.value_error "Function `max` called on empty Vector."
| [VVector arr] -> find_max_arr "max" arr
| [VNA _] -> Error.na_value_error ~na_rm:true "max"
| [val_] -> Error.type_error (Printf.sprintf "Function `max` expects a numeric List or Vector, but received %s." (Utils.type_name val_))
| _ -> Error.arity_error_named "max" 1 (List.length args)))
env