# Module Bigarray.Array2

    module Array2: sig .. end

Two-dimensional arrays. The `Array2` structure provides operations similar to those of `Bigarray.Genarray`, but specialized to the case of two-dimensional arrays.

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

The type of two-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 -> int -> ('a, 'b, 'c) t

`Array2.create kind layout dim1 dim2` returns a new Bigarray of two dimensions, whose size is `dim1` in the first dimension and `dim2` in the second dimension. `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 -> (int -> int -> 'a) -> ('a, 'b, 'c) t

`Array2.init kind layout dim1 dim2 f` returns a new Bigarray `b` of two dimensions, whose size is `dim2` in the first dimension and `dim2` in the second dimension. `kind` and `layout` determine the array element kind and the array layout as described for `Bigarray.Genarray.create`.

Each element `Array2.get b i j` of the array is initialized to the result of `f i j`.

In other words, `Array2.init kind layout dim1 dim2 f` tabulates the results of `f` applied to the indices of a new Bigarray whose layout is described by `kind`, `layout`, `dim1` and `dim2`.

- Since 4.12.0

    val dim1 : ('a, 'b, 'c) t -> int

Return the first dimension of the given two-dimensional Bigarray.

    val dim2 : ('a, 'b, 'c) t -> int

Return the second dimension of the given two-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

`Array2.change_layout a layout` returns a Bigarray with the specified `layout`, sharing the data with `a` (and hence having the same dimensions as `a`). No copying of elements is involved: the new array and the original array share the same storage space. The dimensions are reversed, such that `get v [| a; b |]` in C layout becomes `get v [| b+1; a+1 |]` in Fortran layout.

- 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 -> int -> 'a

`Array2.get a x y`, also written `a.{x,y}`, returns the element of `a` at coordinates (`x`, `y`). `x` and `y` must be within the bounds of `a`, as described for `Bigarray.Genarray.get`; otherwise, `Invalid_argument` is raised.

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

`Array2.set a x y v`, or alternatively `a.{x,y} <- v`, stores the value `v` at coordinates (`x`, `y`) in `a`. `x` and `y` must be within the bounds of `a`, as described for `Bigarray.Genarray.set`; otherwise, `Invalid_argument` is raised.

    val sub_left : ('a, 'b, Bigarray.c_layout) t ->
           int -> int -> ('a, 'b, Bigarray.c_layout) t

Extract a two-dimensional sub-array of the given two-dimensional Bigarray by restricting the first dimension. See `Bigarray.Genarray.sub_left` for more details. `Array2.sub_left` applies only to arrays with C layout.

    val sub_right : ('a, 'b, Bigarray.fortran_layout) t ->
           int -> int -> ('a, 'b, Bigarray.fortran_layout) t

Extract a two-dimensional sub-array of the given two-dimensional Bigarray by restricting the second dimension. See `Bigarray.Genarray.sub_right` for more details. `Array2.sub_right` applies only to arrays with Fortran layout.

    val slice_left : ('a, 'b, Bigarray.c_layout) t ->
           int -> ('a, 'b, Bigarray.c_layout) Bigarray.Array1.t

Extract a row (one-dimensional slice) of the given two-dimensional Bigarray. The integer parameter is the index of the row to extract. See `Bigarray.Genarray.slice_left` for more details. `Array2.slice_left` applies only to arrays with C layout.

    val slice_right : ('a, 'b, Bigarray.fortran_layout) t ->
           int -> ('a, 'b, Bigarray.fortran_layout) Bigarray.Array1.t

Extract a column (one-dimensional slice) of the given two-dimensional Bigarray. The integer parameter is the index of the column to extract. See `Bigarray.Genarray.slice_right` for more details. `Array2.slice_right` applies only to arrays with Fortran layout.

    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 array -> ('a, 'b, 'c) t

Build a two-dimensional Bigarray initialized from the given array of arrays.

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

Like `Bigarray.Array2.get`, but bounds checking is not always performed.

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

Like `Bigarray.Array2.set`, but bounds checking is not always performed.