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Fill a double-precision floating-point strided array with a specified scalar constant.
import dfill from 'https://cdn.jsdelivr.net/gh/stdlib-js/blas-ext-base-dfill@esm/index.mjs';Fills a double-precision floating-point strided array with a specified scalar constant.
import Float64Array from 'https://cdn.jsdelivr.net/gh/stdlib-js/array-float64@esm/index.mjs';
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 => <Float64Array>[ 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. - 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:
import Float64Array from 'https://cdn.jsdelivr.net/gh/stdlib-js/array-float64@esm/index.mjs';
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 => <Float64Array>[ 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 views.
import Float64Array from 'https://cdn.jsdelivr.net/gh/stdlib-js/array-float64@esm/index.mjs';
// 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 => <Float64Array>[ 1.0, 5.0, 3.0, 5.0, 5.0, 5.0 ]Fills a double-precision floating-point strided array with a specified scalar constant using alternative indexing semantics.
import Float64Array from 'https://cdn.jsdelivr.net/gh/stdlib-js/array-float64@esm/index.mjs';
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 => <Float64Array>[ 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 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:
import Float64Array from 'https://cdn.jsdelivr.net/gh/stdlib-js/array-float64@esm/index.mjs';
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 => <Float64Array>[ 1.0, -2.0, 3.0, 5.0, 5.0, 5.0 ]- If
N <= 0, both functions returnxunchanged.
<!DOCTYPE html>
<html lang="en">
<body>
<script type="module">
import discreteUniform from 'https://cdn.jsdelivr.net/gh/stdlib-js/random-array-discrete-uniform@esm/index.mjs';
import dfill from 'https://cdn.jsdelivr.net/gh/stdlib-js/blas-ext-base-dfill@esm/index.mjs';
var x = discreteUniform( 10, -100, 100, {
'dtype': 'float64'
});
console.log( x );
dfill( x.length, 5.0, x, 1 );
console.log( x );
</script>
</body>
</html>@stdlib/blas-ext/base/gfill: fill a strided array with a specified scalar constant.@stdlib/blas-ext/base/sfill: fill a single-precision floating-point strided array with a specified scalar constant.
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.
See LICENSE.
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