# Module Bigarray.Array1

    module Array1: sig .. end

One-dimensional arrays. The `Array1` structure provides operations similar to those of `Bigarray.Genarray`, but specialized to the case of one-dimensional arrays. (The `Bigarray.Array2` and `Bigarray.Array3` structures below provide operations specialized for two- and three-dimensional arrays.) Statically knowing the number of dimensions of the array allows faster operations, and more precise static type-checking.

    type ('a, 'b, 'c) t

The type of one-dimensional Bigarrays whose elements have OCaml type `'a`, representation kind `'b`, and memory layout `'c`.

    val create : ('a, 'b) Bigarray.kind ->
           'c Bigarray.layout -> int -> ('a, 'b, 'c) t

`Array1.create kind layout dim` returns a new Bigarray of one dimension, whose size is `dim`. `kind` and `layout` determine the array element kind and the array layout as described for `Bigarray.Genarray.create`.

    val init : ('a, 'b) Bigarray.kind ->
           'c Bigarray.layout -> int -> (int -> 'a) -> ('a, 'b, 'c) t

`Array1.init kind layout dim f` returns a new Bigarray `b` of one dimension, whose size is `dim`. `kind` and `layout` determine the array element kind and the array layout as described for `Bigarray.Genarray.create`.

Each element `Array1.get b i` of the array is initialized to the result of `f i`.

In other words, `Array1.init kind layout dimensions f` tabulates the results of `f` applied to the indices of a new Bigarray whose layout is described by `kind`, `layout` and `dim`.

- Since 4.12.0

    val dim : ('a, 'b, 'c) t -> int

Return the size (dimension) of the given one-dimensional Bigarray.

    val kind : ('a, 'b, 'c) t -> ('a, 'b) Bigarray.kind

Return the kind of the given Bigarray.

    val layout : ('a, 'b, 'c) t -> 'c Bigarray.layout

Return the layout of the given Bigarray.

    val change_layout : ('a, 'b, 'c) t ->
           'd Bigarray.layout -> ('a, 'b, 'd) t

`Array1.change_layout a layout` returns a Bigarray with the specified `layout`, sharing the data with `a` (and hence having the same dimension as `a`). No copying of elements is involved: the new array and the original array share the same storage space.

- Since 4.06.0

    val size_in_bytes : ('a, 'b, 'c) t -> int

`size_in_bytes a` is the number of elements in `a` multiplied by `a`'s `Bigarray.kind_size_in_bytes`.

- Since 4.03.0

    val get : ('a, 'b, 'c) t -> int -> 'a

`Array1.get a x`, or alternatively `a.{x}`, returns the element of `a` at index `x`. `x` must be greater or equal than `0` and strictly less than `Array1.dim a` if `a` has C layout. If `a` has Fortran layout, `x` must be greater or equal than `1` and less or equal than `Array1.dim a`. Otherwise, `Invalid_argument` is raised.

    val set : ('a, 'b, 'c) t -> int -> 'a -> unit

`Array1.set a x v`, also written `a.{x} <- v`, stores the value `v` at index `x` in `a`. `x` must be inside the bounds of `a` as described in `Bigarray.Array1.get`; otherwise, `Invalid_argument` is raised.

    val sub : ('a, 'b, 'c) t ->
           int -> int -> ('a, 'b, 'c) t

Extract a sub-array of the given one-dimensional Bigarray. See `Bigarray.Genarray.sub_left` for more details.

    val slice : ('a, 'b, 'c) t -> int -> ('a, 'b, 'c) Bigarray.Array0.t

Extract a scalar (zero-dimensional slice) of the given one-dimensional Bigarray. The integer parameter is the index of the scalar to extract. See `Bigarray.Genarray.slice_left` and `Bigarray.Genarray.slice_right` for more details.

- Since 4.05.0

    val blit : ('a, 'b, 'c) t -> ('a, 'b, 'c) t -> unit

Copy the first Bigarray to the second Bigarray. See `Bigarray.Genarray.blit` for more details.

    val fill : ('a, 'b, 'c) t -> 'a -> unit

Fill the given Bigarray with the given value. See `Bigarray.Genarray.fill` for more details.

    val of_array : ('a, 'b) Bigarray.kind ->
           'c Bigarray.layout -> 'a array -> ('a, 'b, 'c) t

Build a one-dimensional Bigarray initialized from the given array.

    val unsafe_get : ('a, 'b, 'c) t -> int -> 'a

Like `Bigarray.Array1.get`, but bounds checking is not always performed. Use with caution and only when the program logic guarantees that the access is within bounds.

    val unsafe_set : ('a, 'b, 'c) t -> int -> 'a -> unit

Like `Bigarray.Array1.set`, but bounds checking is not always performed. Use with caution and only when the program logic guarantees that the access is within bounds.