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offsetView

Return a typed array view having the same data type as a provided input typed array and starting at a specified index offset.

Installation

npm install @stdlib/strided-base-offset-view

Alternatively,

• To load the package in a website via a script tag without installation and bundlers, use the ES Module available on the esm branch (see README).
• If you are using Deno, visit the deno branch (see README for usage intructions).
• For use in Observable, or in browser/node environments, use the Universal Module Definition (UMD) build available on the umd branch (see README).

The branches.md file summarizes the available branches and displays a diagram illustrating their relationships.

To view installation and usage instructions specific to each branch build, be sure to explicitly navigate to the respective README files on each branch, as linked to above.

Usage

var offsetView = require( '@stdlib/strided-base-offset-view' );

offsetView( x, offset )

Returns a typed array view having the same data type as a provided input typed array and starting at a specified index offset.

var Float64Array = require( '@stdlib/array-float64' );

var x = new Float64Array( 10 );

var view = offsetView( x, 0 );
// returns <Float64Array>

var bool = ( view.buffer === x.buffer );
// returns true

var len = view.length;
// returns 10

The offset argument specifies the starting index of the returned typed array view relative to the input array x.

var Float64Array = require( '@stdlib/array-float64' );

var x = new Float64Array( [ 1.0, 2.0, 3.0, 4.0, 5.0, 6.0, 7.0, 8.0 ] );

var view = offsetView( x, 2 );
// returns <Float64Array>

var len = view.length;
// returns 6

var v1 = view[ 0 ];
// returns 3.0

var v2 = view[ 1 ];
// returns 4.0

Examples

var Float64Array = require( '@stdlib/array-float64' );
var offsetView = require( '@stdlib/strided-base-offset-view' );

// Define a typed array:
var x = new Float64Array( [ 1.0, 2.0, 3.0, 4.0, 5.0, 6.0, 7.0, 8.0 ] );
// returns <Float64Array>

// Create a view of the array:
var view = offsetView( x, 0 );
// returns <Float64Array>

// Set view elements:
view[ 0 ] = 9.0;
view[ 1 ] = 10.0;

// Get the first two elements of the original array:
var v0 = x[ 0 ];
// returns 9.0

var v1 = x[ 1 ];
// returns 10.0

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See Also

• @stdlib/strided-base/min-view-buffer-index: return the minimum accessible index based on a set of provided strided array parameters.

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Notice

This package is part of stdlib, a standard library for JavaScript and Node.js, 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.

Community

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License

See LICENSE.

Copyright

Copyright © 2016-2024. The Stdlib Authors.