@stdlib/blas-ext-base-dfill

Fill a double-precision floating-point strided array with a specified scalar constant.

https://github.com/stdlib-js/blas-ext-base-dfill

Science Score: 44.0%

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Keywords

array assign blas broadcast constant copy equal extended fill float64 javascript math mathematics ndarray node node-js nodejs set stdlib strided

Last synced: 4 months ago · JSON representation ·

Repository

Fill a double-precision floating-point strided array with a specified scalar constant.

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Host: GitHub
Owner: stdlib-js
License: apache-2.0
Language: JavaScript
Default Branch: main
Homepage: https://github.com/stdlib-js/stdlib
Size: 582 KB

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array assign blas broadcast constant copy equal extended fill float64 javascript math mathematics ndarray node node-js nodejs set stdlib strided

Created over 4 years ago · Last pushed 7 months ago

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Readme Changelog Contributing License Code of conduct Citation Security

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!

dfill

Fill a double-precision floating-point strided array with a specified scalar constant.

## Installation ```bash npm install @stdlib/blas-ext-base-dfill ``` 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 dfill = require( '@stdlib/blas-ext-base-dfill' ); ``` #### dfill( N, alpha, x, strideX ) Fills a double-precision floating-point strided array with a specified scalar constant. ```javascript var Float64Array = require( '@stdlib/array-float64' ); var x = new Float64Array( [ -2.0, 1.0, 3.0, -5.0, 4.0, 0.0, -1.0, -3.0 ] ); dfill( x.length, 5.0, x, 1 ); // x => [ 5.0, 5.0, 5.0, 5.0, 5.0, 5.0, 5.0, 5.0 ] ``` The function has the following parameters: - **N**: number of indexed elements. - **alpha**: scalar constant. - **x**: input [`Float64Array`][@stdlib/array/float64]. - **strideX**: stride length. The `N` and stride parameters determine which elements in the strided array are accessed at runtime. For example, to fill every other element: ```javascript var Float64Array = require( '@stdlib/array-float64' ); var x = new Float64Array( [ -2.0, 1.0, 3.0, -5.0, 4.0, 0.0, -1.0, -3.0 ] ); dfill( 4, 5.0, x, 2 ); // x => [ 5.0, 1.0, 5.0, -5.0, 5.0, 0.0, 5.0, -3.0 ] ``` Note that indexing is relative to the first index. To introduce an offset, use [`typed array`][mdn-typed-array] views. ```javascript var Float64Array = require( '@stdlib/array-float64' ); // Initial array... var x0 = new Float64Array( [ 1.0, -2.0, 3.0, -4.0, 5.0, -6.0 ] ); // Create an offset view... var x1 = new Float64Array( x0.buffer, x0.BYTES_PER_ELEMENT*1 ); // start at 2nd element // Fill every other element... dfill( 3, 5.0, x1, 2 ); // x0 => [ 1.0, 5.0, 3.0, 5.0, 5.0, 5.0 ] ``` #### dfill.ndarray( N, alpha, x, strideX, offsetX ) Fills a double-precision floating-point strided array with a specified scalar constant using alternative indexing semantics. ```javascript var Float64Array = require( '@stdlib/array-float64' ); var x = new Float64Array( [ -2.0, 1.0, 3.0, -5.0, 4.0, 0.0, -1.0, -3.0 ] ); dfill.ndarray( x.length, 5.0, x, 1, 0 ); // x => [ 5.0, 5.0, 5.0, 5.0, 5.0, 5.0, 5.0, 5.0 ] ``` The function has the following additional parameters: - **offsetX**: starting index. While [`typed array`][mdn-typed-array] views mandate a view offset based on the underlying buffer, the offset parameter supports indexing semantics based on a starting index. For example, to access only the last three elements: ```javascript var Float64Array = require( '@stdlib/array-float64' ); var x = new Float64Array( [ 1.0, -2.0, 3.0, -4.0, 5.0, -6.0 ] ); dfill.ndarray( 3, 5.0, x, 1, x.length-3 ); // x => [ 1.0, -2.0, 3.0, 5.0, 5.0, 5.0 ] ```

## Notes - If `N <= 0`, both functions return `x` unchanged.

## Examples ```javascript var discreteUniform = require( '@stdlib/random-array-discrete-uniform' ); var dfill = require( '@stdlib/blas-ext-base-dfill' ); var x = discreteUniform( 10, -100, 100, { 'dtype': 'float64' }); console.log( x ); dfill( x.length, 5.0, x, 1 ); console.log( x ); ```

## C APIs

### Usage ```c #include "stdlib/blas/ext/base/dfill.h" ``` #### stdlib_strided_dfill( N, alpha, \*X, strideX ) Fills a double-precision floating-point strided array with a specified scalar constant. ```c double x[] = { 1.0, 2.0, 3.0, 4.0 }; stdlib_strided_dfill( 4, 5.0, x, 1 ); ``` The function accepts the following arguments: - **N**: `[in] CBLAS_INT` number of indexed elements. - **alpha**: `[in] double` scalar constant. - **X**: `[out] double*` input array. - **strideX**: `[in] CBLAS_INT` stride length. ```c void stdlib_strided_dfill( const CBLAS_INT N, const double alpha, double *X, const CBLAS_INT strideX ); ``` #### stdlib_strided_dfill_ndarray( N, alpha, \*X, strideX, offsetX ) Fills a double-precision floating-point strided array with a specified scalar constant using alternative indexing semantics. ```c double x[] = { 1.0, 2.0, 3.0, 4.0 }; stdlib_strided_dfill_ndarray( 4, 5.0, x, 1, 0 ); ``` The function accepts the following arguments: - **N**: `[in] CBLAS_INT` number of indexed elements. - **alpha**: `[in] double` scalar constant. - **X**: `[out] double*` input array. - **strideX**: `[in] CBLAS_INT` stride length. - **offsetX**: `[in] CBLAS_INT` starting index. ```c void stdlib_strided_dfill_ndarray( const CBLAS_INT N, const double alpha, double *X, const CBLAS_INT strideX, const CBLAS_INT offsetX ); ```

### Examples ```c #include "stdlib/blas/ext/base/dfill.h" #include int main( void ) { // Create a strided array: double x[] = { 1.0, -2.0, 3.0, -4.0, 5.0, -6.0, 7.0, -8.0 }; // Specify the number of indexed elements: const int N = 8; // Specify a stride: const int strideX = 1; // Fill the array: stdlib_strided_dfill( N, 5.0, x, strideX ); // Print the result: for ( int i = 0; i < 8; i++ ) { printf( "x[ %i ] = %lf\n", i, x[ i ] ); } } ```

* * * ## 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].

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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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npmjs.org: @stdlib/blas-ext-base-dfill

Fill a double-precision floating-point strided array with a specified scalar constant.

Homepage: https://stdlib.io
License: Apache-2.0
Latest release: 0.2.2
published over 1 year ago

Versions: 15
Dependent Packages: 4
Dependent Repositories: 5
Downloads: 398 Last month

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Downloads: 5.4%

Average: 9.4%

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planeshifter rreusser stdlib-bot kgryte

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@stdlib/assert-is-browser ^0.0.x development
@stdlib/bench ^0.0.x development
@stdlib/math-base-assert-is-nan ^0.0.x development
@stdlib/math-base-special-pow ^0.0.x development
@stdlib/math-base-special-round ^0.0.x development
@stdlib/random-base-randu ^0.0.x development
istanbul ^0.4.1 development
proxyquire ^2.0.0 development
tap-spec 5.x.x development
tape git+https://github.com/kgryte/tape.git#fix/globby development
@stdlib/assert-is-error ^0.0.x
@stdlib/utils-define-nonenumerable-read-only-property ^0.0.x
@stdlib/utils-library-manifest ^0.0.x
@stdlib/utils-try-require ^0.0.x

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@stdlib/blas-ext-base-dfill

Science Score: 44.0%

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