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blas-ext-base-zfill

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

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

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array assign blas broadcast complex128 complex128array constant copy equal extended fill javascript math mathematics node node-js nodejs set stdlib strided
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Fill a double-precision complex floating-point strided array with a specified scalar constant.

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array assign blas broadcast complex128 complex128array constant copy equal extended fill javascript math mathematics node node-js nodejs set stdlib strided
Created over 1 year ago · Last pushed 11 months ago
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README.md

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zfill

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

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

## Installation ```bash npm install @stdlib/blas-ext-base-zfill ``` 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 zfill = require( '@stdlib/blas-ext-base-zfill' ); ``` #### zfill( N, alpha, x, strideX ) Fills a double-precision complex floating-point strided array `x` with a specified scalar constant `alpha`. ```javascript var Float64Array = require( '@stdlib/array-float64' ); var Complex128Array = require( '@stdlib/array-complex128' ); var Complex128 = require( '@stdlib/complex-float64-ctor' ); var real = require( '@stdlib/complex-float64-real' ); var imag = require( '@stdlib/complex-float64-imag' ); var arr = new Float64Array( [ 1.0, 2.0, 3.0, 4.0, 5.0, 6.0, 7.0, 8.0 ] ); var x = new Complex128Array( arr ); var alpha = new Complex128( 10.0, 10.0 ); zfill( x.length, alpha, x, 1 ); var y = x.get( 0 ); // returns var re = real( y ); // returns 10.0 var im = imag( y ); // returns 10.0 ``` The function has the following parameters: - **N**: number of indexed elements. - **alpha**: scalar constant. - **x**: input [`Complex128Array`][@stdlib/array/complex128]. - **strideX**: index increment. 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 Complex128Array = require( '@stdlib/array-complex128' ); var Complex128 = require( '@stdlib/complex-float64-ctor' ); var real = require( '@stdlib/complex-float64-real' ); var imag = require( '@stdlib/complex-float64-imag' ); var arr = new Float64Array( [ 1.0, 2.0, 3.0, 4.0, 5.0, 6.0, 7.0, 8.0 ] ); var x = new Complex128Array( arr ); var alpha = new Complex128( 10.0, 10.0 ); zfill( 2, alpha, x, 2 ); var y = x.get( 0 ); // returns var re = real( y ); // returns 10.0 var im = imag( y ); // returns 10.0 y = x.get( 1 ); // returns re = real( y ); // returns 3.0 im = imag( y ); // returns 4.0 ``` 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' ); var Complex128Array = require( '@stdlib/array-complex128' ); var Complex128 = require( '@stdlib/complex-float64-ctor' ); var real = require( '@stdlib/complex-float64-real' ); var imag = require( '@stdlib/complex-float64-imag' ); // Create the underlying floating-point array: var arr = new Float64Array( [ 1.0, 2.0, 3.0, 4.0, 5.0, 6.0, 7.0, 8.0 ] ); // Initial array: var x0 = new Complex128Array( arr ); // Create an offset view: var x1 = new Complex128Array( x0.buffer, x0.BYTES_PER_ELEMENT*1 ); // start at 2nd element // Define a scalar constant: var alpha = new Complex128( 10.0, 10.0 ); // Fill every other element: zfill( 2, alpha, x1, 2 ); var y = x0.get( 0 ); // returns var re = real( y ); // returns 1.0 var im = imag( y ); // returns 2.0 y = x0.get( 1 ); // returns re = real( y ); // returns 10.0 im = imag( y ); // returns 10.0 ``` #### zfill.ndarray( N, alpha, x, strideX, offsetX ) Fills a double-precision complex floating-point strided array `x` with a specified scalar constant `alpha` using alternative indexing semantics. ```javascript var Float64Array = require( '@stdlib/array-float64' ); var Complex128Array = require( '@stdlib/array-complex128' ); var Complex128 = require( '@stdlib/complex-float64-ctor' ); var real = require( '@stdlib/complex-float64-real' ); var imag = require( '@stdlib/complex-float64-imag' ); var arr = new Float64Array( [ 1.0, 2.0, 3.0, 4.0, 5.0, 6.0, 7.0, 8.0 ] ); var x = new Complex128Array( arr ); var alpha = new Complex128( 10.0, 10.0 ); zfill.ndarray( x.length, alpha, x, 1, 0 ); var y = x.get( 0 ); // returns var re = real( y ); // returns 10.0 var im = imag( y ); // returns 10.0 ``` 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 two elements of the strided array ```javascript var Float64Array = require( '@stdlib/array-float64' ); var Complex128Array = require( '@stdlib/array-complex128' ); var Complex128 = require( '@stdlib/complex-float64-ctor' ); var real = require( '@stdlib/complex-float64-real' ); var imag = require( '@stdlib/complex-float64-imag' ); var arr = new Float64Array( [ 1.0, 2.0, 3.0, 4.0, 5.0, 6.0 ] ); var x = new Complex128Array( arr ); var alpha = new Complex128( 10.0, 10.0 ); zfill.ndarray( 2, alpha, x, 1, x.length-2 ); var y = x.get( 0 ); // returns var re = real( y ); // returns 1.0 var im = imag( y ); // returns 2.0 y = x.get( 1 ); // returns re = real( y ); // returns 10.0 im = imag( y ); // returns 10.0 y = x.get( 2 ); // returns re = real( y ); // returns 10.0 im = imag( y ); // returns 10.0 ```
## Notes - If `N <= 0`, both functions return the strided array unchanged.
## Examples ```javascript var discreteUniform = require( '@stdlib/random-array-discrete-uniform' ); var Complex128 = require( '@stdlib/complex-float64-ctor' ); var Complex128Array = require( '@stdlib/array-complex128' ); var zfill = require( '@stdlib/blas-ext-base-zfill' ); var xbuf = discreteUniform( 20, -100, 100, { 'dtype': 'float64' }); var x = new Complex128Array( xbuf.buffer ); var alpha = new Complex128( 10.0, 10.0 ); zfill( x.length, alpha, x, 1 ); console.log( x.get( 0 ).toString() ); ```
## C APIs
### Usage ```c #include "stdlib/blas/ext/base/zfill.h" ``` #### stdlib_strided_zfill( N, alpha, \*X, strideX ) Fills a double-precision complex floating-point strided array `X` with a specified scalar constant `alpha`. ```c double x[] = { 1.0, 2.0, 3.0, 4.0 }; const stdlib_complex128_t alpha = stdlib_complex128( 2.0, 2.0 ); stdlib_strided_zfill( 2, alpha, (stdlib_complex128_t *)x, 1 ); ``` The function accepts the following arguments: - **N**: `[in] CBLAS_INT` number of indexed elements. - **alpha**: `[in] stdlib_complex128_t` scalar constant. - **X**: `[out] stdlib_complex128_t*` input array. - **strideX**: `[in] CBLAS_INT` index increment for `X`. ```c void stdlib_strided_zfill( const CBLAS_INT N, const stdlib_complex128_t alpha, stdlib_complex128_t *X, const CBLAS_INT strideX ); ``` #### stdlib_strided_zfill_ndarray( N, alpha, \*X, strideX, offsetX ) Fills a double-precision complex floating-point strided array `X` with a specified scalar constant `alpha` using alternative indexing semantics. ```c double x[] = { 1.0, 2.0, 3.0, 4.0 }; const stdlib_complex128_t alpha = stdlib_complex128( 2.0, 2.0 ); stdlib_strided_zfill_ndarray( 4, alpha, (stdlib_complex128_t *x), 1, 0 ); ``` The function accepts the following arguments: - **N**: `[in] CBLAS_INT` number of indexed elements. - **alpha**: `[in] stdlib_complex128_t` scalar constant. - **X**: `[out] stdlib_complex128_t*` input array. - **strideX**: `[in] CBLAS_INT` index increment for `X`. - **offsetX**: `[in] CBLAS_INT` starting index for `X`. ```c void stdlib_strided_zfill_ndarray( const CBLAS_INT N, const stdlib_complex128_t alpha, stdlib_complex128_t *X, const CBLAS_INT strideX, const CBLAS_INT offsetX ); ```
### Examples ```c #include "stdlib/complex/float64/ctor.h" #include "stdlib/blas/ext/base/zfill.h" #include int main() { // Create a strided array of interleaved real and imaginary components: double x[] = { 1.0, 2.0, 3.0, 4.0, 5.0, 6.0, 7.0, 8.0 }; // Create a scalar constant: const stdlib_complex128_t alpha = stdlib_complex128( 2.0, 2.0 ); // Specify the number of elements: const int N = 4; // Specify a stride: const int strideX = 1; // Fill the array: stdlib_strided_zfill( N, alpha, (stdlib_complex128_t *)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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  • Login: stdlib-js
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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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