feat: add array/base/unary4d-by

lib/node_modules/@stdlib/array/base/unary4d-by/README.md

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+<!--
+
+@license Apache-2.0
+
+Copyright (c) 2024 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.
+
+-->
+
+# unary4dBy
+
+> Apply a unary function to each element retrieved from a four-dimensional nested input array according to a callback function and assign results to elements in a four-dimensional nested output array.
+
+<section class="intro">
+
+</section>
+
+<!-- /.intro -->
+
+<section class="usage">
+
+## Usage
+
+```javascript
+var unary4dBy = require( '@stdlib/array/base/unary4d-by' );
+```
+
+#### unary4dBy( arrays, shape, fcn, clbk\[, thisArg] )
+
+Applies a unary function to each element retrieved from a four-dimensional nested input array according to a callback function and assigns results to elements in a four-dimensional nested output array.
+
+```javascript
+var abs = require( '@stdlib/math/base/special/abs' );
+
+function accessor( v ) {
+    return v * 2.0;
+}
+
+var x = [ [ [ [ -1.0, -2.0 ], [ -3.0, -4.0 ] ] ] ];
+var shape = [ 1, 1, 2, 2 ];
+
+unary4dBy( [ x, x ], shape, abs, accessor );
+// x => [ [ [ [ 2.0, 4.0 ], [ 6.0, 8.0 ] ] ] ]
+```
+
+The function accepts the following arguments:
+
+-   **arrays**: array-like object containing one input nested array and one output nested array.
+-   **shape**: array shape.
+-   **fcn**: unary function to apply to callback return values.
+-   **clbk**: callback function.
+-   **thisArg**: callback function execution context (optional).
+
+The invoked callback function is provided the following arguments:
+
+-   **value**: array element.
+-   **indices**: current array element indices.
+-   **arrays**: input and output arrays.
+
+To set the callback execution context, provide a `thisArg`.
+
+<!-- eslint-disable no-invalid-this -->
+
+```javascript
+var abs = require( '@stdlib/math/base/special/abs' );
+
+function accessor( v ) {
+    this.count += 1;
+    return v * 2.0;
+}
+
+var context = {
+    'count': 0
+};
+
+var x = [ [ [ [ -1.0, -2.0 ], [ -3.0, -4.0 ] ] ] ];
+var y = [ [ [ [ 0.0, 0.0 ], [ 0.0, 0.0 ] ] ] ];
+
+var shape = [ 1, 1, 2, 2 ];
+
+unary4dBy( [ x, y ], shape, abs, accessor, context );
+// y => [ [ [ [ 2.0, 4.0 ], [ 6.0, 8.0 ] ] ] ]
+
+var cnt = context.count;
+// returns 4
+```
+
+</section>
+
+<!-- /.usage -->
+
+<section class="notes">
+
+## Notes
+
+-   If a provided callback function does not return any value (or equivalently, explicitly returns `undefined`), the value is **ignored**.
+
+    ```javascript
+    var abs = require( '@stdlib/math/base/special/abs' );
+
+    function accessor() {
+        // No-op...
+    }
+
+    var x = [ [ [ [ -1.0, -2.0 ], [ -3.0, -4.0 ] ] ] ];
+    var y = [ [ [ [ 0.0, 0.0 ], [ 0.0, 0.0 ] ] ] ];
+
+    var shape = [ 1, 1, 2, 2 ];
+
+    unary4dBy( [ x, y ], shape, abs, accessor );
+    // y => [ [ [ [ 0.0, 0.0 ], [ 0.0, 0.0 ] ] ] ]
+    ```
+
+-   The function assumes that the input and output arrays have the same shape.
+
+</section>
+
+<!-- /.notes -->
+
+<section class="examples">
+
+## Examples
+
+<!-- eslint no-undef: "error" -->
+
+```javascript
+var discreteUniform = require( '@stdlib/random/base/discrete-uniform' ).factory;
+var bernoulli = require( '@stdlib/random/base/bernoulli' );
+var filled4dBy = require( '@stdlib/array/base/filled4d-by' );
+var zeros4d = require( '@stdlib/array/base/zeros4d' );
+var abs = require( '@stdlib/math/base/special/abs' );
+var unary4dBy = require( '@stdlib/array/base/unary4d-by' );
+
+function accessor( v ) {
+    // Randomly determine whether a value should be considered "missing":
+    return ( bernoulli( 0.5 ) > 0 ) ? v : void 0;
+}
+
+var shape = [ 2, 2, 3, 3 ];
+
+var x = filled4dBy( shape, discreteUniform( -100, 100 ) );
+console.log( x );
+
+var y = zeros4d( shape );
+console.log( y );
+
+unary4dBy( [ x, y ], shape, abs, accessor );
+console.log( 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 for all links. Make sure to keep an empty line after the `section` element and another before the `/section` close. -->
+
+<section class="links">
+
+</section>
+
+<!-- /.links -->

lib/node_modules/@stdlib/array/base/unary4d-by/benchmark/benchmark.js

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+/**
+* @license Apache-2.0
+*
+* Copyright (c) 2024 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 uniform = require( '@stdlib/random/base/uniform' ).factory;
+var isnan = require( '@stdlib/math/base/assert/is-nan' );
+var pow = require( '@stdlib/math/base/special/pow' );
+var floor = require( '@stdlib/math/base/special/floor' );
+var identity = require( '@stdlib/math/base/special/identity' );
+var filled4dBy = require( '@stdlib/array/base/filled4d-by' );
+var zeros4d = require( '@stdlib/array/base/zeros4d' );
+var numel = require( '@stdlib/ndarray/base/numel' );
+var pkg = require( './../package.json' ).name;
+var unary4dBy = require( './../lib' );
+
+
+// FUNCTIONS //
+
+/**
+* Accessor function.
+*
+* @private
+* @param {number} value - array element
+* @returns {number} accessed value
+*/
+function accessor( value ) {
+	return value;
+}
+
+/**
+* Creates a benchmark function.
+*
+* @private
+* @param {PositiveIntegerArray} shape - array shape
+* @returns {Function} benchmark function
+*/
+function createBenchmark( shape ) {
+	var arrays;
+	var x;
+	var y;
+
+	x = filled4dBy( shape, uniform( -100.0, 100.0 ) );
+	y = zeros4d( shape );
+
+	arrays = [ x, y ];
+
+	return benchmark;
+
+	/**
+	* Benchmark function.
+	*
+	* @private
+	* @param {Benchmark} b - benchmark instance
+	*/
+	function benchmark( b ) {
+		var i0;
+		var i1;
+		var i2;
+		var i3;
+		var i;
+
+		b.tic();
+		for ( i = 0; i < b.iterations; i++ ) {
+			unary4dBy( arrays, shape, identity, accessor );
+			i3 = i % shape[ 0 ];
+			i2 = i % shape[ 1 ];
+			i1 = i % shape[ 2 ];
+			i0 = i % shape[ 3 ];
+			if ( isnan( arrays[ 1 ][ i3 ][ i2 ][ i1 ][ i0 ] ) ) {
+				b.fail( 'should not return NaN' );
+			}
+		}
+		b.toc();
+
+		i3 = i % shape[ 0 ];
+		i2 = i % shape[ 1 ];
+		i1 = i % shape[ 2 ];
+		i0 = i % shape[ 3 ];
+		if ( isnan( arrays[ 1 ][ i3 ][ i2 ][ i1 ][ i0 ] ) ) {
+			b.fail( 'should not return NaN' );
+		}
+		b.pass( 'benchmark finished' );
+		b.end();
+	}
+}
+
+
+// MAIN //
+
+/**
+* Main execution sequence.
+*
+* @private
+*/
+function main() {
+	var min;
+	var max;
+	var sh;
+	var N;
+	var f;
+	var i;
+
+	min = 1; // 10^min
+	max = 6; // 10^max
+
+	for ( i = min; i <= max; i++ ) {
+		N = floor( pow( pow( 10, i ), 1.0/4.0 ) );
+		sh = [ N, N, N, N ];
+		f = createBenchmark( sh );
+		bench( pkg+'::equidimensional:size='+numel( sh ), f );
+	}
+}
+
+main();

lib/node_modules/@stdlib/array/base/unary4d-by/docs/repl.txt

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+
+{{alias}}( arrays, shape, fcn, clbk[, thisArg] )
+    Applies a unary function to each element retrieved from a four-dimensional
+    nested input array according to a callback function and assigns results to
+    elements in a four-dimensional nested output array.
+
+    The callback function is provided the following arguments:
+
+    - value: array element.
+    - indices: current array element indices.
+    - arrays: input and output arrays.
+
+    If the callback function does not return any value (or equivalently,
+    explicitly returns `undefined`), the value is ignored.
+
+    Parameters
+    ----------
+    arrays: ArrayLikeObject
+        Array-like object containing one input nested array and one output
+        nested array.
+
+    shape: Array<integer>
+        Array shape.
+
+    fcn: Function
+        Unary function to apply to callback return values.
+
+    clbk: Function
+        Callback function.
+
+    thisArg: any (optional)
+        Callback execution context.
+
+    Examples
+    --------
+    > var x = [ [ [ [ -1.0, -2.0 ], [ -3.0, -4.0 ] ] ] ];
+    > var y = [ [ [ [ 0.0, 0.0 ], [ 0.0, 0.0 ] ] ] ];
+    > var shape = [ 1, 1, 2, 2 ];
+    > function clbk( v ) { return v * 2.0; };
+    > {{alias}}( [ x, y ], shape, {{alias:@stdlib/math/base/special/abs}}, clbk );
+    > y
+    [ [ [ [ 2.0, 4.0 ], [ 6.0, 8.0 ] ] ] ]
+
+    See Also
+    --------
+