feat: add ndarray/to-filled-slice

lib/node_modules/@stdlib/ndarray/to-filled-slice/README.md

@@ -0,0 +1,219 @@
+<!--
+
+@license Apache-2.0
+
+Copyright (c) 2026 The Stdlib Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+   http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+
+-->
+
+# toFilledSlice
+
+> Return a new [`ndarray`][@stdlib/ndarray/ctor] with a specified slice region filled with a provided value.
+
+<section class="intro">
+
+</section>
+
+<!-- /.intro -->
+
+<section class="usage">
+
+## Usage
+
+```javascript
+var toFilledSlice = require( '@stdlib/ndarray/to-filled-slice' );
+```
+
+#### toFilledSlice( x, value, ...s\[, options] )
+
+Returns a new [`ndarray`][@stdlib/ndarray/ctor] with a specified slice region filled with a provided value.
+
+<!-- eslint-disable max-len -->
+
+```javascript
+var zeros = require( '@stdlib/ndarray/zeros' );
+var MultiSlice = require( '@stdlib/slice/multi' );
+var Slice = require( '@stdlib/slice/ctor' );
+
+var x = zeros( [ 3, 4 ], {
+    'dtype': 'float64'
+});
+// returns <ndarray>[ [ 0.0, 0.0, 0.0, 0.0 ], [ 0.0, 0.0, 0.0, 0.0 ], [ 0.0, 0.0, 0.0, 0.0 ] ]
+
+// Define an interior fill region:
+var s0 = new Slice( 1, 2 );
+var s1 = new Slice( 1, 3 );
+var s = new MultiSlice( s0, s1 );
+
+// Fill the region with a scalar value:
+var y = toFilledSlice( x, 9.0, s );
+// returns <ndarray>[ [ 0.0, 0.0, 0.0, 0.0 ], [ 0.0, 9.0, 9.0, 0.0 ], [ 0.0, 0.0, 0.0, 0.0 ] ]
+
+var bool = ( y === x );
+// returns false
+```
+
+The function accepts the following arguments:
+
+-   **x**: input [`ndarray`][@stdlib/ndarray/ctor].
+-   **value**: fill value.
+-   **s**: a [`MultiSlice`][@stdlib/slice/multi] instance, an array of slice arguments, or slice arguments as separate arguments.
+-   **options**: function options.
+
+The function supports three (mutually exclusive) means for providing slice arguments:
+
+1.  providing a single [`MultiSlice`][@stdlib/slice/multi] instance.
+2.  providing a single array of slice arguments.
+3.  providing slice arguments as separate arguments.
+
+The following example demonstrates each invocation style achieving equivalent results.
+
+<!-- eslint-disable max-len -->
+
+```javascript
+var zeros = require( '@stdlib/ndarray/zeros' );
+var MultiSlice = require( '@stdlib/slice/multi' );
+var Slice = require( '@stdlib/slice/ctor' );
+
+var s0 = new Slice( 1, 2 );
+var s1 = new Slice( 1, 3 );
+var s = new MultiSlice( s0, s1 );
+
+// 1. Using a MultiSlice:
+var x = zeros( [ 3, 4 ], {
+    'dtype': 'float64'
+});
+// returns <ndarray>[ [ 0.0, 0.0, 0.0, 0.0 ], [ 0.0, 0.0, 0.0, 0.0 ], [ 0.0, 0.0, 0.0, 0.0 ] ]
+
+var out = toFilledSlice( x, 9.0, s );
+// returns <ndarray>[ [ 0.0, 0.0, 0.0, 0.0 ], [ 0.0, 9.0, 9.0, 0.0 ], [ 0.0, 0.0, 0.0, 0.0 ] ]
+
+// 2. Using an array of slice arguments:
+out = toFilledSlice( x, 9.0, [ s0, s1 ] );
+// returns <ndarray>[ [ 0.0, 0.0, 0.0, 0.0 ], [ 0.0, 9.0, 9.0, 0.0 ], [ 0.0, 0.0, 0.0, 0.0 ] ]
+
+// 3. Providing separate arguments:
+out = toFilledSlice( x, 9.0, s0, s1 );
+// returns <ndarray>[ [ 0.0, 0.0, 0.0, 0.0 ], [ 0.0, 9.0, 9.0, 0.0 ], [ 0.0, 0.0, 0.0, 0.0 ] ]
+```
+
+The function supports the following options:
+
+-   **strict**: boolean indicating whether to enforce strict bounds checking.
+
+By default, the function throws an error when provided a slice which exceeds array bounds. To ignore slice indices exceeding array bounds, set the `strict` option to `false`.
+
+<!-- eslint-disable max-len -->
+
+```javascript
+var zeros = require( '@stdlib/ndarray/zeros' );
+var MultiSlice = require( '@stdlib/slice/multi' );
+var Slice = require( '@stdlib/slice/ctor' );
+
+var x = zeros( [ 3, 4 ], {
+    'dtype': 'float64'
+});
+// returns <ndarray>[ [ 0.0, 0.0, 0.0, 0.0 ], [ 0.0, 0.0, 0.0, 0.0 ], [ 0.0, 0.0, 0.0, 0.0 ] ]
+
+// Define the fill region:
+var s0 = new Slice( 1, null, 1 );
+var s1 = new Slice( 10, 20, 1 );
+var s = new MultiSlice( s0, s1 );
+
+// Return a copy of `x` (out-of-bounds slice is ignored):
+var y = toFilledSlice( x, 9.0, s, {
+    'strict': false
+});
+// returns <ndarray>[ [ 0.0, 0.0, 0.0, 0.0 ], [ 0.0, 0.0, 0.0, 0.0 ], [ 0.0, 0.0, 0.0, 0.0 ] ]
+```
+
+</section>
+
+<!-- /.usage -->
+
+<section class="notes">
+
+## Notes
+
+-   The function does **not** mutate the input [`ndarray`][@stdlib/ndarray/ctor].
+-   The output [`ndarray`][@stdlib/ndarray/ctor] has the same [data type][@stdlib/ndarray/dtypes], shape, and memory layout as the input [`ndarray`][@stdlib/ndarray/ctor].
+-   A **slice argument** must be either a [`Slice`][@stdlib/slice/ctor], an integer, `null`, or `undefined`.
+-   Each slice argument must have an absolute index increment equal to one. Otherwise, the function throws an error.
+-   If a fill value is a number and `x` has a complex [data type][@stdlib/ndarray/dtypes], the function fills the specified region with a complex number whose real component equals the provided fill `value` and whose imaginary component is zero.
+-   A fill value must be able to safely cast to the input [`ndarray`][@stdlib/ndarray/ctor] [data type][@stdlib/ndarray/dtypes]. Fill values having floating-point data types (both real and complex) are allowed to downcast to a lower precision data type of the same kind (e.g., a scalar double-precision floating-point number can be used to fill a `'float32'` input [`ndarray`][@stdlib/ndarray/ctor]).
+
+</section>
+
+<!-- /.notes -->
+
+<section class="examples">
+
+## Examples
+
+<!-- eslint no-undef: "error" -->
+
+```javascript
+var discreteUniform = require( '@stdlib/random/discrete-uniform' );
+var MultiSlice = require( '@stdlib/slice/multi' );
+var Slice = require( '@stdlib/slice/ctor' );
+var ndarray2array = require( '@stdlib/ndarray/to-array' );
+var toFilledSlice = require( '@stdlib/ndarray/to-filled-slice' );
+
+// Create an input ndarray:
+var x = discreteUniform( [ 2, 3, 4 ], -10, 10, {
+    'dtype': 'float64'
+});
+console.log( ndarray2array( x ) );
+
+// Define the fill region:
+var s0 = new Slice( 1, 2 );
+var s1 = new Slice( null, null );
+var s2 = new Slice( 2, 4 );
+var s = new MultiSlice( s0, s1, s2 );
+
+// Fill the region with a scalar value:
+var y = toFilledSlice( x, 0.0, s );
+console.log( ndarray2array( y ) );
+```
+
+</section>
+
+<!-- /.examples -->
+
+<!-- Section for related `stdlib` packages. Do not manually edit this section, as it is automatically populated. -->
+
+<section class="related">
+
+</section>
+
+<!-- /.related -->
+
+<section class="links">
+
+[@stdlib/slice/multi]: https://github.com/stdlib-js/stdlib/tree/develop/lib/node_modules/%40stdlib/slice/multi
+
+[@stdlib/slice/ctor]: https://github.com/stdlib-js/stdlib/tree/develop/lib/node_modules/%40stdlib/slice/ctor
+
+[@stdlib/ndarray/ctor]: https://github.com/stdlib-js/stdlib/tree/develop/lib/node_modules/%40stdlib/ndarray/ctor
+
+[@stdlib/ndarray/dtypes]: https://github.com/stdlib-js/stdlib/tree/develop/lib/node_modules/%40stdlib/ndarray/dtypes
+
+<!-- <related-links> -->
+
+<!-- </related-links> -->
+
+</section>
+
+<!-- /.links -->

lib/node_modules/@stdlib/ndarray/to-filled-slice/benchmark/benchmark.1d.js

@@ -0,0 +1,125 @@
+/**
+* @license Apache-2.0
+*
+* Copyright (c) 2026 The Stdlib Authors.
+*
+* Licensed under the Apache License, Version 2.0 (the "License");
+* you may not use this file except in compliance with the License.
+* You may obtain a copy of the License at
+*
+*    http://www.apache.org/licenses/LICENSE-2.0
+*
+* Unless required by applicable law or agreed to in writing, software
+* distributed under the License is distributed on an "AS IS" BASIS,
+* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+* See the License for the specific language governing permissions and
+* limitations under the License.
+*/
+
+'use strict';
+
+// MODULES //
+
+var bench = require( '@stdlib/bench' );
+var pow = require( '@stdlib/math/base/special/pow' );
+var isndarrayLike = require( '@stdlib/assert/is-ndarray-like' );
+var discreteUniform = require( '@stdlib/random/discrete-uniform' );
+var MultiSlice = require( '@stdlib/slice/multi' );
+var format = require( '@stdlib/string/format' );
+var pkg = require( './../package.json' ).name;
+var toFilledSlice = require( './../lib' );
+
+
+// VARIABLES //
+
+var types = [ 'float64' ];
+var orders = [ 'row-major', 'column-major' ];
+
+
+// FUNCTIONS //
+
+/**
+* Creates a benchmark function.
+*
+* @private
+* @param {NonNegativeIntegerArray} shape - ndarray shape
+* @param {string} xtype - input ndarray data type
+* @param {string} order - memory layout
+* @returns {Function} benchmark function
+*/
+function createBenchmark( shape, xtype, order ) {
+	var x;
+	var s;
+
+	x = discreteUniform( shape, -10, 10, {
+		'dtype': xtype,
+		'order': order
+	});
+	s = new MultiSlice( null );
+	return benchmark;
+
+	/**
+	* Benchmark function.
+	*
+	* @private
+	* @param {Benchmark} b - benchmark instance
+	*/
+	function benchmark( b ) {
+		var out;
+		var i;
+
+		b.tic();
+		for ( i = 0; i < b.iterations; i++ ) {
+			out = toFilledSlice( x, i, s );
+			if ( typeof out !== 'object' ) {
+				b.fail( 'should return an ndarray' );
+			}
+		}
+		b.toc();
+		if ( !isndarrayLike( out ) ) {
+			b.fail( 'should return an ndarray' );
+		}
+		b.pass( 'benchmark finished' );
+		b.end();
+	}
+}
+
+
+// MAIN //
+
+/**
+* Main execution sequence.
+*
+* @private
+*/
+function main() {
+	var len;
+	var min;
+	var max;
+	var ord;
+	var sh;
+	var t1;
+	var f;
+	var i;
+	var j;
+	var k;
+
+	min = 1; // 10^min
+	max = 6; // 10^max
+
+	for ( k = 0; k < orders.length; k++ ) {
+		ord = orders[ k ];
+		for ( j = 0; j < types.length; j++ ) {
+			t1 = types[ j ];
+			for ( i = min; i <= max; i++ ) {
+				len = pow( 10, i );
+
+				sh = [ len ];
+				f = createBenchmark( sh, t1, ord );
+				bench( format( '%s:ndims=%d,len=%d,shape=[%s],xorder=%s,xtype=%s', pkg, sh.length, len, sh.join( ',' ), ord, t1 ), f );
+			}
+		}
+	}
+}
+
+main();