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@stdlib/ndarray-base-vind2bind

Convert a linear index in an array view to a linear index in an underlying data buffer.

https://github.com/stdlib-js/ndarray-base-vind2bind

Science Score: 44.0%

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Keywords

array base index javascript linear multidimensional ndarray node node-js nodejs offset shape stdlib strides types util utilities utility utils view
Last synced: 4 months ago · JSON representation ·

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Convert a linear index in an array view to a linear index in an underlying data buffer.

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Topics
array base index javascript linear multidimensional ndarray node node-js nodejs offset shape stdlib strides types util utilities utility utils view
Created over 4 years ago · Last pushed 8 months ago
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README.md

About stdlib...

We believe in a future in which the web is a preferred environment for numerical computation. To help realize this future, we've built stdlib. stdlib is a standard library, with an emphasis on numerical and scientific computation, written in JavaScript (and C) for execution in browsers and in Node.js.

The library is fully decomposable, being architected in such a way that you can swap out and mix and match APIs and functionality to cater to your exact preferences and use cases.

When you use stdlib, you can be absolutely certain that you are using the most thorough, rigorous, well-written, studied, documented, tested, measured, and high-quality code out there.

To join us in bringing numerical computing to the web, get started by checking us out on GitHub, and please consider financially supporting stdlib. We greatly appreciate your continued support!

vind2bind

NPM version Build Status Coverage Status <!-- dependencies -->

Convert a linear index in an array view to a linear index in an underlying data buffer.

## Installation ```bash npm install @stdlib/ndarray-base-vind2bind ``` Alternatively, - To load the package in a website via a `script` tag without installation and bundlers, use the [ES Module][es-module] available on the [`esm`][esm-url] branch (see [README][esm-readme]). - If you are using Deno, visit the [`deno`][deno-url] branch (see [README][deno-readme] for usage intructions). - For use in Observable, or in browser/node environments, use the [Universal Module Definition (UMD)][umd] build available on the [`umd`][umd-url] branch (see [README][umd-readme]). The [branches.md][branches-url] 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 ```javascript var vind2bind = require( '@stdlib/ndarray-base-vind2bind' ); ``` #### vind2bind( shape, strides, offset, order, idx, mode ) Converts a linear index in an array view to a linear index in an underlying data buffer. ```javascript var shape = [ 3, 3 ]; var order = 'row-major'; var strides = [ -3, 1 ]; var offset = 6; var idx = vind2bind( shape, strides, offset, order, 1, 'throw' ); // returns 7 ``` The function supports the following modes: - **throw**: specifies that the function should throw an error when a linear index exceeds array dimensions. - **normalize**: specifies that the function should normalize negative linear indices and throw an error when a linear index exceeds array dimensions. - **wrap**: specifies that the function should wrap around a linear index exceeding array dimensions using modulo arithmetic. - **clamp**: specifies that the function should set a linear index exceeding array dimensions to either `0` (minimum linear index) or the maximum linear index. ```javascript var shape = [ 2, 2 ]; var order = 'row-major'; var strides = [ -2, 1 ]; var offset = 2; var idx = vind2bind( shape, strides, offset, order, -2, 'wrap' ); // returns 0 idx = vind2bind( shape, strides, offset, order, 10, 'clamp' ); // returns 1 ``` The `order` parameter specifies whether an array is `row-major` (C-style) or `column-major` (Fortran-style). ```javascript var shape = [ 2, 2 ]; var order = 'column-major'; var strides = [ 1, -2 ]; var offset = 2; var idx = vind2bind( shape, strides, offset, order, 2, 'throw' ); // returns 0 ```
## Examples ```javascript var shape2strides = require( '@stdlib/ndarray-base-shape2strides' ); var strides2offset = require( '@stdlib/ndarray-base-strides2offset' ); var numel = require( '@stdlib/ndarray-base-numel' ); var randu = require( '@stdlib/random-base-randu' ); var vind2bind = require( '@stdlib/ndarray-base-vind2bind' ); // Specify array meta data: var shape = [ 3, 3, 3 ]; var order = 'row-major'; // Compute array meta data: var len = numel( shape ); var strides = shape2strides( shape, order ); // Randomly flip the sign of strides... var i; for ( i = 0; i < shape.length; i++ ) { if ( randu() < 0.5 ) { strides[ i ] *= -1; } } // Compute the underlying data buffer index offset: var offset = strides2offset( shape, strides ); // Print array info: console.log( 'Dims: %s', shape.join( 'x' ) ); console.log( 'Strides: %s', strides.join( ',' ) ); console.log( 'Offset: %d', offset ); // For each view index, determine the corresponding index into an array's underlying data buffer... var ind; for ( i = 0; i < len; i++ ) { ind = vind2bind( shape, strides, offset, order, i, 'throw' ); console.log( 'view[%d] => buffer[%d]', i, ind ); } ```
* * * ## Notice This package is part of [stdlib][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][stdlib], see the main project [repository][stdlib]. #### Community [![Chat][chat-image]][chat-url] --- ## License See [LICENSE][stdlib-license]. ## Copyright Copyright © 2016-2025. The Stdlib [Authors][stdlib-authors].

Owner

  • Name: stdlib
  • Login: stdlib-js
  • Kind: organization

Standard library for JavaScript.

Citation (CITATION.cff) 

cff-version: 1.2.0
title: stdlib
message: >-
  If you use this software, please cite it using the
  metadata from this file.

type: software

authors:
  - name: The Stdlib Authors
    url: https://github.com/stdlib-js/stdlib/graphs/contributors

repository-code: https://github.com/stdlib-js/stdlib
url: https://stdlib.io

abstract: |
  Standard library for JavaScript and Node.js.

keywords:
  - JavaScript
  - Node.js
  - TypeScript
  - standard library
  - scientific computing
  - numerical computing
  - statistical computing

license: Apache-2.0 AND BSL-1.0

date-released: 2016

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  • Total packages: 1
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    • npm 6,428 last-month
  • Total dependent packages: 21
  • Total dependent repositories: 12
  • Total versions: 13
  • Total maintainers: 4
npmjs.org: @stdlib/ndarray-base-vind2bind

Convert a linear index in an array view to a linear index in an underlying data buffer.

  • Homepage: https://stdlib.io
  • License: Apache-2.0
  • Latest release: 0.2.2
    published over 1 year ago
  • Versions: 13
  • Dependent Packages: 21
  • Dependent Repositories: 12
  • Downloads: 6,428 Last month
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Dependent packages count: 1.1%
Downloads: 3.1%
Dependent repos count: 3.4%
Average: 8.0%
Forks count: 15.4%
Stargazers count: 16.7%
Maintainers (4)
planeshifter rreusser stdlib-bot kgryte
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  • url: https://opencollective.com/stdlib
Last synced: 4 months ago

Dependencies

package.json npm
  • @stdlib/assert-is-integer ^0.0.x development
  • @stdlib/bench ^0.0.x development
  • @stdlib/math-base-special-floor ^0.0.x development
  • @stdlib/ndarray-base-numel ^0.0.x development
  • @stdlib/ndarray-base-shape2strides ^0.0.x development
  • @stdlib/ndarray-base-strides2offset ^0.0.x development
  • @stdlib/random-base-randu ^0.0.x development
  • istanbul ^0.4.1 development
  • tap-spec 5.x.x development
  • tape git+https://github.com/kgryte/tape.git#fix/globby development
  • @stdlib/ndarray-index-modes ^0.0.x
  • @stdlib/ndarray-orders ^0.0.x
  • @stdlib/string-format ^0.0.x
  • @stdlib/types ^0.0.x
  • @stdlib/utils-library-manifest ^0.0.x
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