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ndarray

Multidimensional array constructor.

Usage

import ndarray from 'https://cdn.jsdelivr.net/gh/stdlib-js/ndarray-ctor@esm/index.mjs';

ndarray( dtype, buffer, shape, strides, offset, order[, options] )

Returns an ndarray instance.

// Specify the array configuration:
var buffer = [ 1.0, 2.0, 3.0, 4.0 ];
var shape = [ 2, 2 ];
var order = 'row-major';
var strides = [ 2, 1 ];
var offset = 0;

// Create a new ndarray:
var arr = ndarray( 'generic', buffer, shape, strides, offset, order );
// returns <ndarray>

The constructor expects the following arguments:

dtype: underlying data type.
buffer: data buffer.
shape: array shape (dimensions).
strides: array strides which are index offsets specifying how to access along corresponding dimensions.
offset: index offset specifying the location of the first indexed element in the data buffer.
order: array order, which is either row-major (C-style) or column-major (Fortran-style).

The constructor accepts the following options:

mode: specifies how to handle indices which exceed array dimensions. Default: 'throw'.
submode: a mode array which specifies for each dimension how to handle subscripts which exceed array dimensions. If provided fewer modes than dimensions, the constructor recycles modes using modulo arithmetic. Default: [ options.mode ].
readonly: boolean indicating whether an array should be read-only. Default: false.

The constructor supports the following modes:

throw: specifies that an ndarray instance should throw an error when an index exceeds array dimensions.
normalize: specifies that an ndarray instance should normalize negative indices and throw an error when an index exceeds array dimensions.
wrap: specifies that an ndarray instance should wrap around an index exceeding array dimensions using modulo arithmetic.
clamp: specifies that an ndarray instance should set an index exceeding array dimensions to either 0 (minimum index) or the maximum index.

By default, an ndarray instance throws when provided an index which exceeds array dimensions. To support alternative indexing behavior, set the mode option, which will affect all public methods for getting and setting array elements.

var opts = {
    'mode': 'clamp'
};

// Specify the array configuration:
var buffer = [ 1.0, 2.0, 3.0, 4.0 ];
var shape = [ 2, 2 ];
var order = 'row-major';
var strides = [ 2, 1 ];
var offset = 0;

// Create a new ndarray:
var arr = ndarray( 'generic', buffer, shape, strides, offset, order, opts );
// returns <ndarray>

// Attempt to access an out-of-bounds linear index (clamped):
var v = arr.iget( 10 );
// returns 4.0

By default, the mode option is applied to subscripts which exceed array dimensions. To specify behavior for each dimension, set the submode option.

var opts = {
    'submode': [ 'wrap', 'clamp' ]
};

// Specify the array configuration:
var buffer = [ 1.0, 2.0, 3.0, 4.0, 5.0, 6.0, 7.0, 8.0 ];
var shape = [ 2, 2, 2 ];
var order = 'row-major';
var strides = [ 4, 2, 1 ];
var offset = 0;

// Create a new ndarray:
var arr = ndarray( 'generic', buffer, shape, strides, offset, order, opts );
// returns <ndarray>

// Attempt to access out-of-bounds subscripts:
var v = arr.get( -2, 10, -1 ); // linear index: 3
// returns 4.0

Properties

ndarray.name

String value of the ndarray constructor name.

var str = ndarray.name;
// returns 'ndarray'

ndarray.prototype.byteLength

Size (in bytes) of the array (if known).

import Float64Array from 'https://cdn.jsdelivr.net/gh/stdlib-js/array-float64@esm/index.mjs';

// Specify the array configuration:
var buffer = new Float64Array( [ 1.0, 2.0, 3.0, 4.0 ] );
var shape = [ 2, 2 ];
var order = 'row-major';
var strides = [ 2, 1 ];
var offset = 0;

// Create a new ndarray:
var arr = ndarray( 'float64', buffer, shape, strides, offset, order );

// Get the byte length:
var nbytes = arr.byteLength;
// returns 32

If unable to determine the size of the array, the property value is null.

// Specify the array configuration:
var buffer = [ 1.0, 2.0, 3.0, 4.0 ];
var shape = [ 2, 2 ];
var order = 'row-major';
var strides = [ 2, 1 ];
var offset = 0;

// Create a new ndarray:
var arr = ndarray( 'generic', buffer, shape, strides, offset, order );

// Get the byte length:
var nbytes = arr.byteLength;
// returns null

ndarray.prototype.BYTES_PER_ELEMENT

Size (in bytes) of each array element (if known).

import Float32Array from 'https://cdn.jsdelivr.net/gh/stdlib-js/array-float32@esm/index.mjs';

// Specify the array configuration:
var buffer = new Float32Array( [ 1.0, 2.0, 3.0, 4.0 ] );
var shape = [ 2, 2 ];
var order = 'row-major';
var strides = [ 2, 1 ];
var offset = 0;

// Create a new ndarray:
var arr = ndarray( 'float32', buffer, shape, strides, offset, order );

// Get the number of bytes per element:
var nbytes = arr.BYTES_PER_ELEMENT;
// returns 4

If size of each array element is unknown, the property value is null.

// Specify the array configuration:
var buffer = [ 1.0, 2.0, 3.0, 4.0 ];
var shape = [ 2, 2 ];
var order = 'row-major';
var strides = [ 2, 1 ];
var offset = 0;

// Create a new ndarray:
var arr = ndarray( 'generic', buffer, shape, strides, offset, order );

// Get the number of bytes per element:
var nbytes = arr.BYTES_PER_ELEMENT;
// returns null

ndarray.prototype.data

A reference to the underlying data buffer.

import Int8Array from 'https://cdn.jsdelivr.net/gh/stdlib-js/array-int8@esm/index.mjs';

// Specify the array configuration:
var buffer = new Int8Array( [ 1, 2, 3, 4 ] );
var shape = [ 2, 2 ];
var order = 'row-major';
var strides = [ 2, 1 ];
var offset = 0;

// Create a new ndarray:
var arr = ndarray( 'int8', buffer, shape, strides, offset, order );

// Get the buffer reference:
var d = arr.data;
// returns <Int8Array>[ 1, 2, 3, 4 ]

var bool = ( d === buffer );
// returns true

ndarray.prototype.dtype

Underlying data type.

import Uint8Array from 'https://cdn.jsdelivr.net/gh/stdlib-js/array-uint8@esm/index.mjs';

// Specify the array configuration:
var buffer = new Uint8Array( [ 1, 2, 3, 4 ] );
var shape = [ 2, 2 ];
var order = 'row-major';
var strides = [ -2, 1 ];
var offset = 2;

// Create a new ndarray:
var arr = ndarray( 'uint8', buffer, shape, strides, offset, order );

// Get the underlying data type:
var dtype = arr.dtype;
// returns 'uint8'

ndarray.prototype.flags

Meta information, such as information regarding the memory layout of the array. The returned object has the following properties:

ROW_MAJOR_CONTIGUOUS: boolean indicating if an array is row-major contiguous.
COLUMN_MAJOR_CONTIGUOUS: boolean indicating if an array is column-major contiguous.
READONLY: boolean indicating whether an array is read-only.

An array is contiguous if (1) an array is compatible with being stored in a single memory segment and (2) each array element is adjacent to the next array element. Note that an array can be both row-major contiguous and column-major contiguous at the same time (e.g., if an array is a 1-dimensional ndarray with strides = [1]).

import Int32Array from 'https://cdn.jsdelivr.net/gh/stdlib-js/array-int32@esm/index.mjs';

// Specify the array configuration:
var buffer = new Int32Array( [ 1, 2, 3, 4 ] );
var shape = [ 2, 2 ];
var order = 'column-major';
var strides = [ 1, 2 ];
var offset = 0;

// Create a new ndarray:
var arr = ndarray( 'int32', buffer, shape, strides, offset, order );

// Get the array flags:
var flg = arr.flags;
// returns {...}

ndarray.prototype.length

Number of array elements.

import Uint16Array from 'https://cdn.jsdelivr.net/gh/stdlib-js/array-uint16@esm/index.mjs';

// Specify the array configuration:
var buffer = new Uint16Array( [ 1, 2, 3, 4 ] );
var shape = [ 2, 2 ];
var order = 'column-major';
var strides = [ -1, -2 ];
var offset = 3;

// Create a new ndarray:
var arr = ndarray( 'uint16', buffer, shape, strides, offset, order );

// Get the array length:
var len = arr.length;
// returns 4

ndarray.prototype.ndims

Number of dimensions.

import Uint8ClampedArray from 'https://cdn.jsdelivr.net/gh/stdlib-js/array-uint8c@esm/index.mjs';

// Specify the array configuration:
var buffer = new Uint8ClampedArray( [ 1, 2, 3, 4 ] );
var shape = [ 2, 2 ];
var order = 'row-major';
var strides = [ -2, -1 ];
var offset = 3;

// Create a new ndarray:
var arr = ndarray( 'uint8c', buffer, shape, strides, offset, order );

// Get the number of dimensions:
var ndims = arr.ndims;
// returns 2

ndarray.prototype.offset

Index offset which specifies the buffer index at which to start iterating over array elements.

import Int16Array from 'https://cdn.jsdelivr.net/gh/stdlib-js/array-int16@esm/index.mjs';

// Specify the array configuration:
var buffer = new Int16Array( [ 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12 ] );
var shape = [ 2, 2 ];
var order = 'row-major';
var strides = [ -2, -1 ];
var offset = 10;

// Create a new ndarray:
var arr = ndarray( 'int16', buffer, shape, strides, offset, order );

// Get the index offset:
var o = arr.offset;
// returns 10

ndarray.prototype.order

Array order. The array order is either row-major (C-style) or column-major (Fortran-style).

import Uint32Array from 'https://cdn.jsdelivr.net/gh/stdlib-js/array-uint32@esm/index.mjs';

// Specify the array configuration:
var buffer = new Uint32Array( [ 1, 2, 3, 4 ] );
var shape = [ 2, 2 ];
var order = 'row-major';
var strides = [ 2, 1 ];
var offset = 0;

// Create a new ndarray:
var arr = ndarray( 'uint32', buffer, shape, strides, offset, order );

// Get the array order:
var ord = arr.order;
// returns 'row-major'

ndarray.prototype.shape

Returns a copy of the array shape.

// Specify the array configuration:
var buffer = [ 1.0, 2.0, 3.0, 4.0, 5.0, 6.0 ];
var shape = [ 2, 2 ];
var order = 'row-major';
var strides = [ 2, 1 ];
var offset = 2;

// Create a new ndarray:
var arr = ndarray( 'generic', buffer, shape, strides, offset, order );

// Get the array shape:
var dims = arr.shape;
// returns [ 2, 2 ]

ndarray.prototype.strides

Returns a copy of the array strides which specify how to access data along corresponding array dimensions.

// Specify the array configuration:
var buffer = [ 1.0, 2.0, 3.0, 4.0 ];
var shape = [ 2, 2 ];
var order = 'column-major';
var strides = [ -1, 2 ];
var offset = 1;

// Create a new ndarray:
var arr = ndarray( 'generic', buffer, shape, strides, offset, order );

// Get the array strides:
var s = arr.strides;
// returns [ -1, 2 ]

Methods

ndarray.prototype.get( i, j, k, ... )

Returns an array element specified according to provided subscripts. The number of provided subscripts must equal the number of dimensions.

// Specify the array configuration:
var buffer = [ 1.0, 2.0, 3.0, 4.0, 5.0, 6.0, 7.0, 8.0 ];
var shape = [ 2, 2 ];
var order = 'row-major';
var strides = [ 2, 1 ];
var offset = 2;

// Create a new ndarray:
var arr = ndarray( 'generic', buffer, shape, strides, offset, order );

// Get the element located at (1,1):
var v = arr.get( 1, 1 );
// returns 6.0

ndarray.prototype.iget( idx )

Returns an array element located at a specified linear index.

// Specify the array configuration:
var buffer = [ 1.0, 2.0, 3.0, 4.0, 5.0, 6.0, 7.0, 8.0 ];
var shape = [ 2, 2 ];
var order = 'row-major';
var strides = [ 2, 1 ];
var offset = 2;

// Create a new ndarray:
var arr = ndarray( 'generic', buffer, shape, strides, offset, order );

// Get the element located at index 3:
var v = arr.iget( 3 );
// returns 6.0

For zero-dimensional arrays, the input argument is ignored and, for clarity, should not be provided.

ndarray.prototype.set( i, j, k, ..., v )

Sets an array element specified according to provided subscripts. The number of provided subscripts must equal the number of dimensions.

// Specify the array configuration:
var buffer = [ 1.0, 2.0, 3.0, 4.0 ];
var shape = [ 2, 2 ];
var order = 'row-major';
var strides = [ 2, 1 ];
var offset = 0;

// Create a new ndarray:
var arr = ndarray( 'generic', buffer, shape, strides, offset, order );

// Set the element located at (1,1):
arr.set( 1, 1, 40.0 );
var v = arr.get( 1, 1 );
// returns 40.0

// Get the underlying buffer:
var d = arr.data;
// returns [ 1.0, 2.0, 3.0, 40.0 ]

The method returns the ndarray instance. If an array is read-only, the method raises an exception.

ndarray.prototype.iset( idx, v )

Sets an array element located at a specified linear index.

// Specify the array configuration:
var buffer = [ 1.0, 2.0, 3.0, 4.0 ];
var shape = [ 2, 2 ];
var order = 'row-major';
var strides = [ 2, 1 ];
var offset = 0;

// Create a new ndarray:
var arr = ndarray( 'generic', buffer, shape, strides, offset, order );

// Set the element located at index 3:
arr.iset( 3, 40.0 );
var v = arr.iget( 3 );
// returns 40.0

// Get the underlying buffer:
var d = arr.data;
// returns [ 1.0, 2.0, 3.0, 40.0 ]

For zero-dimensional arrays, the first, and only, argument should be the value v to set.

The method returns the ndarray instance. If an array is read-only, the method raises an exception.

ndarray.prototype.toString()

Serializes an ndarray as a string.

// Specify the array configuration:
var buffer = [ 1.0, 2.0, 3.0, 4.0, 5.0, 6.0, 7.0, 8.0 ];
var shape = [ 3, 2 ];
var order = 'row-major';
var strides = [ 2, 1 ];
var offset = 2;

// Create a new ndarray:
var arr = ndarray( 'generic', buffer, shape, strides, offset, order );

// Serialize to a string:
var str = arr.toString();
// returns "ndarray( 'generic', [ 3, 4, 5, 6, 7, 8 ], [ 3, 2 ], [ 2, 1 ], 0, 'row-major' )"

The method does not serialize data outside of the buffer region defined by the array configuration.

ndarray.prototype.toJSON()

Serializes an ndarray as a JSON object. JSON.stringify() implicitly calls this method when stringifying an ndarray instance.

// Specify the array configuration:
var buffer = [ 1.0, 2.0, 3.0, 4.0, 5.0, 6.0, 7.0, 8.0 ];
var shape = [ 3, 2 ];
var order = 'row-major';
var strides = [ 2, 1 ];
var offset = 2;

// Create a new ndarray:
var arr = ndarray( 'generic', buffer, shape, strides, offset, order );

// Serialize to JSON:
var o = arr.toJSON();
// returns { 'type': 'ndarray', 'dtype': 'generic', 'flags': {...}, 'offset': 0, 'order': 'row-major', 'shape': [ 3, 2 ], 'strides': [ 2, 1 ], 'data': [ 3.0, 4.0, 5.0, 6.0, 7.0, 8.0 ] }

The method does not serialize data outside of the buffer region defined by the array configuration.

Notes

To create a zero-dimensional array, provide an empty shape and a single strides element equal to 0. The order can be either row-major or column-major and has no effect on data storage or access.

var buffer = [ 1 ];
var shape = [];
var order = 'row-major';
var strides = [ 0 ];
var offset = 0;

// Create a new zero-dimensional array:
var arr = ndarray( 'generic', buffer, shape, strides, offset, order );
// returns <ndarray>

Examples

<!DOCTYPE html>
<html lang="en">
<body>
<script type="module">

import Float32Array from 'https://cdn.jsdelivr.net/gh/stdlib-js/array-float32@esm/index.mjs';
import ndarray from 'https://cdn.jsdelivr.net/gh/stdlib-js/ndarray-ctor@esm/index.mjs';

// Create a data buffer:
var buffer = new Float32Array( (3*3*3*3) + 100 );

// Specify the array shape:
var shape = [ 3, 3, 3, 3 ];

// Specify the array strides:
var strides = [ 27, 9, 3, 1 ];

// Specify the index offset:
var offset = 4;

// Specify the order:
var order = 'row-major'; // C-style

// Create a new ndarray:
var arr = ndarray( 'float32', buffer, shape, strides, offset, order );

// Retrieve an array value:
var v = arr.get( 1, 2, 1, 2 );
// returns 0.0

// Set an array value:
arr.set( 1, 2, 1, 2, 10.0 );

// Retrieve the array value:
v = arr.get( 1, 2, 1, 2 );
// returns 10.0

// Serialize the array as a string:
var str = arr.toString();
// returns "ndarray( 'float32', new Float32Array( [ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 10, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 ] ), [ 3, 3, 3, 3 ], [ 27, 9, 3, 1 ], 0, 'row-major' )"

// Serialize the array as JSON:
str = JSON.stringify( arr.toJSON() );
// e.g., returns '{"type":"ndarray","dtype":"float32","flags":{"READONLY":false},"order":"row-major","shape":[3,3,3,3],"strides":[27,9,3,1],"data":[0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,10,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0]}'

</script>
</body>
</html>

Notice

This package is part of stdlib, a standard library with an emphasis on numerical and scientific computing. The library provides a collection of robust, high performance libraries for mathematics, statistics, streams, utilities, and more.

For more information on the project, filing bug reports and feature requests, and guidance on how to develop stdlib, see the main project repository.

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README.md

README.md

ndarray

Usage

ndarray( dtype, buffer, shape, strides, offset, order[, options] )

Properties

ndarray.name

ndarray.prototype.byteLength

ndarray.prototype.BYTES_PER_ELEMENT

ndarray.prototype.data

ndarray.prototype.dtype

ndarray.prototype.flags

ndarray.prototype.length

ndarray.prototype.ndims

ndarray.prototype.offset

ndarray.prototype.order

ndarray.prototype.shape

ndarray.prototype.strides

Methods

ndarray.prototype.get( i, j, k, ... )

ndarray.prototype.iget( idx )

ndarray.prototype.set( i, j, k, ..., v )

ndarray.prototype.iset( idx, v )

ndarray.prototype.toString()

ndarray.prototype.toJSON()

Notes

Examples

See Also

Notice

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ndarray

Usage

ndarray( dtype, buffer, shape, strides, offset, order[, options] )

Properties

ndarray.name

ndarray.prototype.byteLength

ndarray.prototype.BYTES_PER_ELEMENT

ndarray.prototype.data

ndarray.prototype.dtype

ndarray.prototype.flags

ndarray.prototype.length

ndarray.prototype.ndims

ndarray.prototype.offset

ndarray.prototype.order

ndarray.prototype.shape

ndarray.prototype.strides

Methods

ndarray.prototype.get( i, j, k, ... )

ndarray.prototype.iget( idx )

ndarray.prototype.set( i, j, k, ..., v )

ndarray.prototype.iset( idx, v )

ndarray.prototype.toString()

ndarray.prototype.toJSON()

Notes

Examples

See Also

Notice

Community

License

Copyright