feat: add blas/ext/join-between

lib/node_modules/@stdlib/blas/ext/join-between/README.md

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+<!--
+
+@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.
+
+-->
+
+# joinBetween
+
+> Return an [ndarray][@stdlib/ndarray/ctor] created by joining elements using specified separators for each pair of consecutive elements along one or more [ndarray][@stdlib/ndarray/ctor] dimensions.
+
+<section class="usage">
+
+## Usage
+
+```javascript
+var joinBetween = require( '@stdlib/blas/ext/join-between' );
+```
+
+#### joinBetween( x, separators\[, options] )
+
+Returns an [ndarray][@stdlib/ndarray/ctor] created by joining elements using specified separators for each pair of consecutive elements along one or more [ndarray][@stdlib/ndarray/ctor] dimensions.
+
+```javascript
+var array = require( '@stdlib/ndarray/array' );
+var scalar2ndarray = require( '@stdlib/ndarray/from-scalar' );
+
+// Create an input ndarray:
+var x = array( [ 1.0, 2.0, 3.0, 4.0, 5.0, 6.0 ] );
+// returns <ndarray>[ 1.0, 2.0, 3.0, 4.0, 5.0, 6.0 ]
+
+// Create a separators ndarray:
+var sep = scalar2ndarray( ',', {
+    'dtype': 'generic'
+});
+
+// Perform operation:
+var out = joinBetween( x, sep );
+// returns <ndarray>[ '1,2,3,4,5,6' ]
+```
+
+The function has the following parameters:
+
+-   **x**: input [ndarray][@stdlib/ndarray/ctor].
+-   **separators**: separators [ndarray][@stdlib/ndarray/ctor]. Must be [broadcast-compatible][@stdlib/ndarray/base/broadcast-shapes] with the shape consisting of the complement of the shape defined by `options.dims` followed by `N-1` where `N` is the number of elements along the reduced dimensions.
+-   **options**: function options (_optional_).
+
+The function accepts the following options:
+
+-   **prefix**: prefix to prepend to each joined string. May be a scalar value or an [ndarray][@stdlib/ndarray/ctor] which is [broadcast-compatible][@stdlib/ndarray/base/broadcast-shapes] with the complement of the shape defined by `options.dims`. Default: `''`.
+-   **suffix**: suffix to append to each joined string. May be a scalar value or an [ndarray][@stdlib/ndarray/ctor] which is [broadcast-compatible][@stdlib/ndarray/base/broadcast-shapes] with the complement of the shape defined by `options.dims`. Default: `''`.
+-   **dims**: list of dimensions over which to perform operation. If not provided, the function performs the operation over all elements in a provided input [ndarray][@stdlib/ndarray/ctor].
+-   **keepdims**: boolean indicating whether the reduced dimensions should be included in the returned [ndarray][@stdlib/ndarray/ctor] as singleton dimensions. Default: `false`.
+
+To specify a prefix and suffix to prepend and append to each joined string, provide `prefix` and `suffix` options.
+
+```javascript
+var array = require( '@stdlib/ndarray/array' );
+var scalar2ndarray = require( '@stdlib/ndarray/from-scalar' );
+
+var x = array( [ 1.0, 2.0, 3.0, 4.0, 5.0, 6.0 ] );
+
+var sep = scalar2ndarray( ', ', {
+    'dtype': 'generic'
+});
+
+var out = joinBetween( x, sep, {
+    'prefix': '[ ',
+    'suffix': ' ]'
+});
+// returns <ndarray>[ '[ 1, 2, 3, 4, 5, 6 ]' ]
+```
+
+By default, the function performs the operation over all elements in a provided input [ndarray][@stdlib/ndarray/ctor]. To perform the operation over specific dimensions, provide a `dims` option.
+
+```javascript
+var array = require( '@stdlib/ndarray/array' );
+var scalar2ndarray = require( '@stdlib/ndarray/from-scalar' );
+
+var x = array( [ [ 1.0, 2.0 ], [ 3.0, 4.0 ] ] );
+
+var sep = scalar2ndarray( ',', {
+    'dtype': 'generic'
+});
+
+var out = joinBetween( x, sep, {
+    'dims': [ 0 ]
+});
+// returns <ndarray>[ '1,3', '2,4' ]
+
+out = joinBetween( x, sep, {
+    'dims': [ 1 ]
+});
+// returns <ndarray>[ '1,2', '3,4' ]
+```
+
+By default, the function excludes reduced dimensions from the output [ndarray][@stdlib/ndarray/ctor]. To include the reduced dimensions as singleton dimensions, set the `keepdims` option to `true`.
+
+```javascript
+var array = require( '@stdlib/ndarray/array' );
+var scalar2ndarray = require( '@stdlib/ndarray/from-scalar' );
+
+var x = array( [ [ 1.0, 2.0 ], [ 3.0, 4.0 ] ] );
+
+var sep = scalar2ndarray( ',', {
+    'dtype': 'generic'
+});
+
+var out = joinBetween( x, sep, {
+    'dims': [ 0 ],
+    'keepdims': true
+});
+// returns <ndarray>[ [ '1,3', '2,4' ] ]
+```
+
+#### joinBetween.assign( x, separators, out\[, options] )
+
+Joins elements of an input [ndarray][@stdlib/ndarray/ctor] using specified separators for each pair of consecutive elements along one or more [ndarray][@stdlib/ndarray/ctor] dimensions and assigns results to a provided output [ndarray][@stdlib/ndarray/ctor].
+
+```javascript
+var array = require( '@stdlib/ndarray/array' );
+var scalar2ndarray = require( '@stdlib/ndarray/from-scalar' );
+
+var x = array( [ 1.0, 2.0, 3.0, 4.0 ] );
+var sep = scalar2ndarray( ',', {
+    'dtype': 'generic'
+});
+var y = scalar2ndarray( '', {
+    'dtype': 'generic'
+});
+
+var out = joinBetween.assign( x, sep, y );
+// returns <ndarray>[ '1,2,3,4' ]
+
+var bool = ( out === y );
+// returns true
+```
+
+The method has the following parameters:
+
+-   **x**: input [ndarray][@stdlib/ndarray/ctor].
+-   **separators**: separators [ndarray][@stdlib/ndarray/ctor]. Must be [broadcast-compatible][@stdlib/ndarray/base/broadcast-shapes] with the shape consisting of the complement of the shape defined by `options.dims` followed by `N-1` where `N` is the number of elements along the reduced dimensions.
+-   **out**: output [ndarray][@stdlib/ndarray/ctor].
+-   **options**: function options (_optional_).
+
+The method accepts the following options:
+
+-   **prefix**: prefix to prepend to each joined string. May be a scalar value or an [ndarray][@stdlib/ndarray/ctor] which is [broadcast-compatible][@stdlib/ndarray/base/broadcast-shapes] with the complement of the shape defined by `options.dims`. Default: `''`.
+-   **suffix**: suffix to append to each joined string. May be a scalar value or an [ndarray][@stdlib/ndarray/ctor] which is [broadcast-compatible][@stdlib/ndarray/base/broadcast-shapes] with the complement of the shape defined by `options.dims`. Default: `''`.
+-   **dims**: list of dimensions over which to perform operation. If not provided, the function performs the operation over all elements in a provided input [ndarray][@stdlib/ndarray/ctor].
+
+</section>
+
+<!-- /.usage -->
+
+<section class="notes">
+
+## Notes
+
+-   Setting the `keepdims` option to `true` can be useful when wanting to ensure that the output [ndarray][@stdlib/ndarray/ctor] is [broadcast-compatible][@stdlib/ndarray/base/broadcast-shapes] with ndarrays having the same shape as the input [ndarray][@stdlib/ndarray/ctor].
+
+</section>
+
+<!-- /.notes -->
+
+<section class="examples">
+
+## Examples
+
+<!-- eslint no-undef: "error" -->
+
+```javascript
+var scalar2ndarray = require( '@stdlib/ndarray/from-scalar' );
+var uniform = require( '@stdlib/random/uniform' );
+var ndarray2array = require( '@stdlib/ndarray/to-array' );
+var joinBetween = require( '@stdlib/blas/ext/join-between' );
+
+var x = uniform( [ 5, 2 ], 0.0, 20.0 );
+console.log( ndarray2array( x ) );
+
+var sep = scalar2ndarray( ', ', {
+    'dtype': 'generic'
+});
+
+var out = joinBetween( x, sep, {
+    'dims': [ -1 ],
+    'prefix': '[ ',
+    'suffix': ' ]'
+});
+console.log( ndarray2array( out ) );
+```
+
+</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">
+
+[@stdlib/ndarray/ctor]: https://github.com/stdlib-js/stdlib/tree/develop/lib/node_modules/%40stdlib/ndarray/ctor
+
+[@stdlib/ndarray/base/broadcast-shapes]: https://github.com/stdlib-js/stdlib/tree/develop/lib/node_modules/%40stdlib/ndarray/base/broadcast-shapes
+
+</section>
+
+<!-- /.links -->

lib/node_modules/@stdlib/blas/ext/join-between/benchmark/benchmark.assign.js

@@ -0,0 +1,118 @@
+/**
+* @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 isString = require( '@stdlib/assert/is-string' ).isPrimitive;
+var pow = require( '@stdlib/math/base/special/pow' );
+var scalar2ndarray = require( '@stdlib/ndarray/from-scalar' );
+var uniform = require( '@stdlib/random/uniform' );
+var empty = require( '@stdlib/ndarray/empty' );
+var format = require( '@stdlib/string/format' );
+var pkg = require( './../package.json' ).name;
+var joinBetween = require( './../lib' );
+
+
+// VARIABLES //
+
+var options = {
+	'dtype': 'float64'
+};
+
+
+// FUNCTIONS //
+
+/**
+* Creates a benchmark function.
+*
+* @private
+* @param {PositiveInteger} len - array length
+* @returns {Function} benchmark function
+*/
+function createBenchmark( len ) {
+	var sep;
+	var out;
+	var x;
+
+	x = uniform( [ len ], -50.0, 50.0, options );
+
+	sep = scalar2ndarray( ',', {
+		'dtype': 'generic'
+	});
+
+	out = empty( [], {
+		'dtype': 'generic'
+	});
+
+	return benchmark;
+
+	/**
+	* Benchmark function.
+	*
+	* @private
+	* @param {Benchmark} b - benchmark instance
+	*/
+	function benchmark( b ) {
+		var o;
+		var i;
+
+		b.tic();
+		for ( i = 0; i < b.iterations; i++ ) {
+			o = joinBetween.assign( x, sep, out );
+			if ( typeof o !== 'object' ) {
+				b.fail( 'should return an ndarray' );
+			}
+		}
+		b.toc();
+		if ( !isString( o.get() ) ) {
+			b.fail( 'should return a string' );
+		}
+		b.pass( 'benchmark finished' );
+		b.end();
+	}
+}
+
+
+// MAIN //
+
+/**
+* Main execution sequence.
+*
+* @private
+*/
+function main() {
+	var len;
+	var min;
+	var max;
+	var f;
+	var i;
+
+	min = 1; // 10^min
+	max = 6; // 10^max
+
+	for ( i = min; i <= max; i++ ) {
+		len = pow( 10, i );
+		f = createBenchmark( len );
+		bench( format( '%s:assign:dtype=%s,len=%d', pkg, options.dtype, len ), f );
+	}
+}
+
+main();