From d8a774b3f32ccea1278a2d09a9ead12bd445cc71 Mon Sep 17 00:00:00 2001
From: iampratik13 <bhagwatpratik781@gmail.com>
Date: Sun, 30 Nov 2025 01:29:11 +0530
Subject: [PATCH 1/8] feat/add-stats-base-ndarray-mskrange

---
 .../stats/base/ndarray/mskrange/README.md     | 123 +++++++++
 .../ndarray/mskrange/benchmark/benchmark.js   | 109 ++++++++
 .../stats/base/ndarray/mskrange/docs/repl.txt |  35 +++
 .../ndarray/mskrange/docs/types/index.d.ts    |  48 ++++
 .../base/ndarray/mskrange/docs/types/test.ts  |  63 +++++
 .../base/ndarray/mskrange/examples/index.js   |  40 +++
 .../stats/base/ndarray/mskrange/lib/index.js  |  47 ++++
 .../stats/base/ndarray/mskrange/lib/main.js   |  59 ++++
 .../stats/base/ndarray/mskrange/package.json  |  64 +++++
 .../stats/base/ndarray/mskrange/test/test.js  | 252 ++++++++++++++++++
 10 files changed, 840 insertions(+)
 create mode 100644 lib/node_modules/@stdlib/stats/base/ndarray/mskrange/README.md
 create mode 100644 lib/node_modules/@stdlib/stats/base/ndarray/mskrange/benchmark/benchmark.js
 create mode 100644 lib/node_modules/@stdlib/stats/base/ndarray/mskrange/docs/repl.txt
 create mode 100644 lib/node_modules/@stdlib/stats/base/ndarray/mskrange/docs/types/index.d.ts
 create mode 100644 lib/node_modules/@stdlib/stats/base/ndarray/mskrange/docs/types/test.ts
 create mode 100644 lib/node_modules/@stdlib/stats/base/ndarray/mskrange/examples/index.js
 create mode 100644 lib/node_modules/@stdlib/stats/base/ndarray/mskrange/lib/index.js
 create mode 100644 lib/node_modules/@stdlib/stats/base/ndarray/mskrange/lib/main.js
 create mode 100644 lib/node_modules/@stdlib/stats/base/ndarray/mskrange/package.json
 create mode 100644 lib/node_modules/@stdlib/stats/base/ndarray/mskrange/test/test.js

diff --git a/lib/node_modules/@stdlib/stats/base/ndarray/mskrange/README.md b/lib/node_modules/@stdlib/stats/base/ndarray/mskrange/README.md
new file mode 100644
index 000000000000..927d470a3f70
--- /dev/null
+++ b/lib/node_modules/@stdlib/stats/base/ndarray/mskrange/README.md
@@ -0,0 +1,123 @@
+<!--
+
+@license Apache-2.0
+
+Copyright (c) 2025 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.
+
+-->
+
+# mskrange
+
+> Calculate the [range][range] of a one-dimensional ndarray according to a mask.
+
+<section class="intro">
+
+</section>
+
+<!-- /.intro -->
+
+<section class="usage">
+
+## Usage
+
+```javascript
+var mskrange = require( '@stdlib/stats/base/ndarray/mskrange' );
+```
+
+#### mskrange( arrays )
+
+Computes the [range][range] of a one-dimensional ndarray according to a mask.
+
+```javascript
+var ndarray = require( '@stdlib/ndarray/base/ctor' );
+
+var xbuf = [ 1.0, -2.0, 4.0, 2.0 ];
+var x = new ndarray( 'generic', xbuf, [ 4 ], [ 1 ], 0, 'row-major' );
+
+var maskbuf = [ 0, 0, 1, 0 ];
+var mask = new ndarray( 'generic', maskbuf, [ 4 ], [ 1 ], 0, 'row-major' );
+
+var v = mskrange( [ x, mask ] );
+// returns 4.0
+```
+
+The function has the following parameters:
+
+-   **arrays**: array-like object containing an input ndarray and a mask ndarray.
+
+If a `mask` array element is `0`, the corresponding element in the input ndarray is considered valid and **included** in computation. If a `mask` array element is `1`, the corresponding element in the input ndarray is considered invalid/missing and **excluded** from computation.
+
+</section>
+
+<!-- /.usage -->
+
+<section class="notes">
+
+## Notes
+
+-   If provided an empty ndarray or a mask with all elements set to `1`, the function returns `NaN`.
+
+</section>
+
+<!-- /.notes -->
+
+<section class="examples">
+
+## Examples
+
+<!-- eslint no-undef: "error" -->
+
+```javascript
+var uniform = require( '@stdlib/random/array/uniform' );
+var bernoulli = require( '@stdlib/random/array/bernoulli' );
+var ndarray = require( '@stdlib/ndarray/base/ctor' );
+var ndarray2array = require( '@stdlib/ndarray/to-array' );
+var mskrange = require( '@stdlib/stats/base/ndarray/mskrange' );
+
+var xbuf = uniform( 10, -50.0, 50.0, {
+    'dtype': 'float64'
+});
+var x = new ndarray( 'generic', xbuf, [ xbuf.length ], [ 1 ], 0, 'row-major' );
+console.log( ndarray2array( x ) );
+
+var maskbuf = bernoulli( xbuf.length, 0.2, {
+    'dtype': 'uint8'
+});
+var mask = new ndarray( 'generic', maskbuf, [ maskbuf.length ], [ 1 ], 0, 'row-major' );
+console.log( ndarray2array( mask ) );
+
+var v = mskrange( [ x, mask ] );
+console.log( v );
+```
+
+</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 -->
diff --git a/lib/node_modules/@stdlib/stats/base/ndarray/mskrange/benchmark/benchmark.js b/lib/node_modules/@stdlib/stats/base/ndarray/mskrange/benchmark/benchmark.js
new file mode 100644
index 000000000000..94eae97cb043
--- /dev/null
+++ b/lib/node_modules/@stdlib/stats/base/ndarray/mskrange/benchmark/benchmark.js
@@ -0,0 +1,109 @@
+/**
+* @license Apache-2.0
+*
+* Copyright (c) 2025 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/array/uniform' );
+var bernoulli = require( '@stdlib/random/array/bernoulli' );
+var isnan = require( '@stdlib/math/base/assert/is-nan' );
+var pow = require( '@stdlib/math/base/special/pow' );
+var ndarray = require( '@stdlib/ndarray/base/ctor' );
+var pkg = require( './../package.json' ).name;
+var mskrange = require( './../lib' );
+
+
+// VARIABLES //
+
+var options = {
+	'dtype': 'generic'
+};
+
+
+// FUNCTIONS //
+
+/**
+* Creates a benchmark function.
+*
+* @private
+* @param {PositiveInteger} len - array length
+* @returns {Function} benchmark function
+*/
+function createBenchmark( len ) {
+	var mask;
+	var mbuf;
+	var xbuf;
+	var x;
+
+	xbuf = uniform( len, -100.0, 100.0, options );
+	x = new ndarray( options.dtype, xbuf, [ len ], [ 1 ], 0, 'row-major' );
+
+	mbuf = bernoulli( len, 0.2, options );
+	mask = new ndarray( options.dtype, mbuf, [ len ], [ 1 ], 0, 'row-major' );
+
+	return benchmark;
+
+	function benchmark( b ) {
+		var v;
+		var i;
+
+		b.tic();
+		for ( i = 0; i < b.iterations; i++ ) {
+			xbuf[ i%len ] = i;
+			v = mskrange( [ x, mask ] );
+			if ( isnan( v ) ) {
+				b.fail( 'should not return NaN' );
+			}
+		}
+		b.toc();
+		if ( isnan( v ) ) {
+			b.fail( 'should not return NaN' );
+		}
+		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( pkg+':len='+len, f );
+	}
+}
+
+main();
diff --git a/lib/node_modules/@stdlib/stats/base/ndarray/mskrange/docs/repl.txt b/lib/node_modules/@stdlib/stats/base/ndarray/mskrange/docs/repl.txt
new file mode 100644
index 000000000000..4b4ed992437f
--- /dev/null
+++ b/lib/node_modules/@stdlib/stats/base/ndarray/mskrange/docs/repl.txt
@@ -0,0 +1,35 @@
+
+{{alias}}( arrays )
+    Calculates the range of a one-dimensional ndarray according to a
+    mask.
+
+    If provided an empty ndarray or a mask with all elements set to `1`, the
+    function returns `NaN`.
+
+    Parameters
+    ----------
+    arrays: ArrayLikeObject<ndarray>
+        Array-like object containing an input ndarray and a mask ndarray.
+
+    Returns
+    -------
+    out: number
+        Range.
+
+    Examples
+    --------
+    > var xbuf = [ 1.0, -2.0, 4.0, 2.0 ];
+    > var dt = 'generic';
+    > var sh = [ xbuf.length ];
+    > var sx = [ 1 ];
+    > var ox = 0;
+    > var ord = 'row-major';
+    > var x = new {{alias:@stdlib/ndarray/ctor}}( dt, xbuf, sh, sx, ox, ord );
+    > var mbuf = [ 0, 0, 1, 0 ];
+    > var mask = new {{alias:@stdlib/ndarray/ctor}}( dt, mbuf, sh, sx, ox, ord );
+    > {{alias}}( [ x, mask ] )
+    4.0
+
+    See Also
+    --------
+
diff --git a/lib/node_modules/@stdlib/stats/base/ndarray/mskrange/docs/types/index.d.ts b/lib/node_modules/@stdlib/stats/base/ndarray/mskrange/docs/types/index.d.ts
new file mode 100644
index 000000000000..6f8dca347052
--- /dev/null
+++ b/lib/node_modules/@stdlib/stats/base/ndarray/mskrange/docs/types/index.d.ts
@@ -0,0 +1,48 @@
+/*
+* @license Apache-2.0
+*
+* Copyright (c) 2025 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.
+*/
+
+// TypeScript Version: 4.1
+
+/// <reference types="@stdlib/types"/>
+
+import { ndarray } from '@stdlib/types/ndarray';
+
+/**
+* Calculates the range of a one-dimensional ndarray according to a mask.
+*
+* @param arrays - array-like object containing an input ndarray and a mask ndarray
+* @returns range
+*
+* @example
+* var ndarray = require( '@stdlib/ndarray/base/ctor' );
+*
+* var xbuf = [ 1.0, -2.0, 4.0, 2.0 ];
+* var x = new ndarray( 'generic', xbuf, [ 4 ], [ 1 ], 0, 'row-major' );
+*
+* var mbuf = [ 0, 0, 1, 0 ];
+* var mask = new ndarray( 'generic', mbuf, [ 4 ], [ 1 ], 0, 'row-major' );
+*
+* var v = mskrange( [ x, mask ] );
+* // returns 4.0
+*/
+declare function mskrange<T extends ndarray = ndarray>( arrays: [ T, T ] ): number;
+
+
+// EXPORTS //
+
+export = mskrange;
diff --git a/lib/node_modules/@stdlib/stats/base/ndarray/mskrange/docs/types/test.ts b/lib/node_modules/@stdlib/stats/base/ndarray/mskrange/docs/types/test.ts
new file mode 100644
index 000000000000..435b1d5eca0b
--- /dev/null
+++ b/lib/node_modules/@stdlib/stats/base/ndarray/mskrange/docs/types/test.ts
@@ -0,0 +1,63 @@
+/*
+* @license Apache-2.0
+*
+* Copyright (c) 2025 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.
+*/
+
+/* eslint-disable space-in-parens */
+
+import zeros = require( '@stdlib/ndarray/zeros' );
+import mskrange = require( './index' );
+
+
+// TESTS //
+
+// The function returns a number...
+{
+	const x = zeros( [ 10 ], {
+		'dtype': 'generic'
+	});
+	const mask = zeros( [ 10 ], {
+		'dtype': 'generic'
+	});
+
+	mskrange( [ x, mask ] ); // $ExpectType number
+}
+
+// The compiler throws an error if the function is provided a first argument which is not an array of ndarrays...
+{
+	mskrange( '10' ); // $ExpectError
+	mskrange( 10 ); // $ExpectError
+	mskrange( true ); // $ExpectError
+	mskrange( false ); // $ExpectError
+	mskrange( null ); // $ExpectError
+	mskrange( undefined ); // $ExpectError
+	mskrange( [] ); // $ExpectError
+	mskrange( {} ); // $ExpectError
+	mskrange( ( x: number ): number => x ); // $ExpectError
+}
+
+// The compiler throws an error if the function is provided an unsupported number of arguments...
+{
+	const x = zeros( [ 10 ], {
+		'dtype': 'generic'
+	});
+	const mask = zeros( [ 10 ], {
+		'dtype': 'generic'
+	});
+
+	mskrange(); // $ExpectError
+	mskrange( [ x, mask ], {} ); // $ExpectError
+}
diff --git a/lib/node_modules/@stdlib/stats/base/ndarray/mskrange/examples/index.js b/lib/node_modules/@stdlib/stats/base/ndarray/mskrange/examples/index.js
new file mode 100644
index 000000000000..ab6f0319f4e3
--- /dev/null
+++ b/lib/node_modules/@stdlib/stats/base/ndarray/mskrange/examples/index.js
@@ -0,0 +1,40 @@
+/**
+* @license Apache-2.0
+*
+* Copyright (c) 2025 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';
+
+var uniform = require( '@stdlib/random/array/uniform' );
+var bernoulli = require( '@stdlib/random/array/bernoulli' );
+var ndarray = require( '@stdlib/ndarray/base/ctor' );
+var ndarray2array = require( '@stdlib/ndarray/to-array' );
+var mskrange = require( './../lib' );
+
+var xbuf = uniform( 10, -50.0, 50.0, {
+	'dtype': 'float64'
+});
+var x = new ndarray( 'generic', xbuf, [ xbuf.length ], [ 1 ], 0, 'row-major' );
+console.log( ndarray2array( x ) );
+
+var maskbuf = bernoulli( xbuf.length, 0.2, {
+	'dtype': 'uint8'
+});
+var mask = new ndarray( 'generic', maskbuf, [ maskbuf.length ], [ 1 ], 0, 'row-major' );
+console.log( ndarray2array( mask ) );
+
+var v = mskrange( [ x, mask ] );
+console.log( v );
diff --git a/lib/node_modules/@stdlib/stats/base/ndarray/mskrange/lib/index.js b/lib/node_modules/@stdlib/stats/base/ndarray/mskrange/lib/index.js
new file mode 100644
index 000000000000..18ee2f543b38
--- /dev/null
+++ b/lib/node_modules/@stdlib/stats/base/ndarray/mskrange/lib/index.js
@@ -0,0 +1,47 @@
+/**
+* @license Apache-2.0
+*
+* Copyright (c) 2025 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';
+
+/**
+* Compute the range of a one-dimensional ndarray according to a mask.
+*
+* @module @stdlib/stats/base/ndarray/mskrange
+*
+* @example
+* var ndarray = require( '@stdlib/ndarray/base/ctor' );
+* var mskrange = require( '@stdlib/stats/base/ndarray/mskrange' );
+*
+* var xbuf = [ 1.0, -2.0, 4.0, 2.0 ];
+* var x = new ndarray( 'generic', xbuf, [ 4 ], [ 1 ], 0, 'row-major' );
+*
+* var mbuf = [ 0, 0, 1, 0 ];
+* var mask = new ndarray( 'generic', mbuf, [ 4 ], [ 1 ], 0, 'row-major' );
+*
+* var v = mskrange( [ x, mask ] );
+* // returns 2.0
+*/
+
+// MODULES //
+
+var main = require( './main.js' );
+
+
+// EXPORTS //
+
+module.exports = main;
diff --git a/lib/node_modules/@stdlib/stats/base/ndarray/mskrange/lib/main.js b/lib/node_modules/@stdlib/stats/base/ndarray/mskrange/lib/main.js
new file mode 100644
index 000000000000..abda05a87178
--- /dev/null
+++ b/lib/node_modules/@stdlib/stats/base/ndarray/mskrange/lib/main.js
@@ -0,0 +1,59 @@
+/**
+* @license Apache-2.0
+*
+* Copyright (c) 2025 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 numelDimension = require( '@stdlib/ndarray/base/numel-dimension' );
+var getStride = require( '@stdlib/ndarray/base/stride' );
+var getOffset = require( '@stdlib/ndarray/base/offset' );
+var getData = require( '@stdlib/ndarray/base/data-buffer' );
+var strided = require( '@stdlib/stats/strided/mskrange' ).ndarray;
+
+
+// MAIN //
+
+/**
+* Computes the range of a one-dimensional ndarray according to a mask.
+*
+* @param {ArrayLikeObject<Object>} arrays - array-like object containing an input ndarray and a mask ndarray
+* @returns {number} range
+*
+* @example
+* var ndarray = require( '@stdlib/ndarray/base/ctor' );
+*
+* var xbuf = [ 1.0, -2.0, 4.0, 2.0 ];
+* var x = new ndarray( 'generic', xbuf, [ 4 ], [ 1 ], 0, 'row-major' );
+*
+* var maskbuf = [ 0, 0, 1, 0 ];
+* var mask = new ndarray( 'generic', maskbuf, [ 4 ], [ 1 ], 0, 'row-major' );
+*
+* var v = mskrange( [ x, mask ] );
+* // returns 4.0
+*/
+function mskrange( arrays ) {
+	var mask = arrays[ 1 ];
+	var x = arrays[ 0 ];
+	return strided( numelDimension( x, 0 ), getData( x ), getStride( x, 0 ), getOffset( x ), getData( mask ), getStride( mask, 0 ), getOffset( mask ) ); // eslint-disable-line max-len
+}
+
+
+// EXPORTS //
+
+module.exports = mskrange;
diff --git a/lib/node_modules/@stdlib/stats/base/ndarray/mskrange/package.json b/lib/node_modules/@stdlib/stats/base/ndarray/mskrange/package.json
new file mode 100644
index 000000000000..43b47ddb0ea0
--- /dev/null
+++ b/lib/node_modules/@stdlib/stats/base/ndarray/mskrange/package.json
@@ -0,0 +1,64 @@
+{
+  "name": "@stdlib/stats/base/ndarray/mskrange",
+  "version": "0.0.0",
+  "description": "Calculate the range of a one-dimensional ndarray according to a mask.",
+  "license": "Apache-2.0",
+  "author": {
+    "name": "The Stdlib Authors",
+    "url": "https://github.com/stdlib-js/stdlib/graphs/contributors"
+  },
+  "contributors": [
+    {
+      "name": "The Stdlib Authors",
+      "url": "https://github.com/stdlib-js/stdlib/graphs/contributors"
+    }
+  ],
+  "main": "./lib",
+  "directories": {
+    "benchmark": "./benchmark",
+    "doc": "./docs",
+    "example": "./examples",
+    "lib": "./lib",
+    "test": "./test"
+  },
+  "types": "./docs/types",
+  "scripts": {},
+  "homepage": "https://github.com/stdlib-js/stdlib",
+  "repository": {
+    "type": "git",
+    "url": "git://github.com/stdlib-js/stdlib.git"
+  },
+  "bugs": {
+    "url": "https://github.com/stdlib-js/stdlib/issues"
+  },
+  "dependencies": {},
+  "devDependencies": {},
+  "engines": {
+    "node": ">=0.10.0",
+    "npm": ">2.7.0"
+  },
+  "os": [
+    "aix",
+    "darwin",
+    "freebsd",
+    "linux",
+    "macos",
+    "openbsd",
+    "sunos",
+    "win32",
+    "windows"
+  ],
+  "keywords": [
+    "stdlib",
+    "stdmath",
+    "statistics",
+    "stats",
+    "mathematics",
+    "math",
+    "range",
+    "masked",
+    "mask",
+    "ndarray"
+  ],
+  "__stdlib__": {}
+}
diff --git a/lib/node_modules/@stdlib/stats/base/ndarray/mskrange/test/test.js b/lib/node_modules/@stdlib/stats/base/ndarray/mskrange/test/test.js
new file mode 100644
index 000000000000..068daf8b97bb
--- /dev/null
+++ b/lib/node_modules/@stdlib/stats/base/ndarray/mskrange/test/test.js
@@ -0,0 +1,252 @@
+/**
+* @license Apache-2.0
+*
+* Copyright (c) 2025 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 tape = require( 'tape' );
+var isnan = require( '@stdlib/math/base/assert/is-nan' );
+var isPositiveZero = require( '@stdlib/math/base/assert/is-positive-zero' );
+var ndarray = require( '@stdlib/ndarray/base/ctor' );
+var mskrange = require( './../lib' );
+
+
+// FUNCTIONS //
+
+/**
+* Returns a one-dimensional ndarray.
+*
+* @private
+* @param {Collection} buffer - underlying data buffer
+* @param {NonNegativeInteger} length - number of indexed elements
+* @param {integer} stride - stride length
+* @param {NonNegativeInteger} offset - index offset
+* @returns {ndarray} one-dimensional ndarray
+*/
+function vector( buffer, length, stride, offset ) {
+	return new ndarray( 'generic', buffer, [ length ], [ stride ], offset, 'row-major' );
+}
+
+
+// TESTS //
+
+tape( 'main export is a function', function test( t ) {
+	t.ok( true, __filename );
+	t.strictEqual( typeof mskrange, 'function', 'main export is a function' );
+	t.end();
+});
+
+tape( 'the function has an arity of 1', function test( t ) {
+	t.strictEqual( mskrange.length, 1, 'has expected arity' );
+	t.end();
+});
+
+tape( 'the function calculates the range value of a one-dimensional ndarray according to a mask', function test( t ) {
+	var mask;
+	var x;
+	var v;
+
+	x = [ 1.0, -2.0, -4.0, NaN, 5.0, 0.0, 3.0 ];
+	mask = [ 0, 0, 0, 1, 0, 0, 0 ];
+	v = mskrange( [ vector( x, x.length, 1, 0 ), vector( mask, mask.length, 1, 0 ) ] );
+	t.strictEqual( v, 9.0, 'returns expected value' );
+
+	x = [ -4.0, NaN, -5.0 ];
+	mask = [ 0, 1, 0 ];
+	v = mskrange( [ vector( x, x.length, 1, 0 ), vector( mask, mask.length, 1, 0 ) ] );
+	t.strictEqual( v, 1.0, 'returns expected value' );
+
+	x = [ -0.0, 0.0, NaN, -0.0 ];
+	mask = [ 0, 0, 1, 0 ];
+	v = mskrange( [ vector( x, x.length, 1, 0 ), vector( mask, mask.length, 1, 0 ) ] );
+	t.strictEqual( isPositiveZero( v ), true, 'returns expected value' );
+
+	x = [ -4.0, 0.0, NaN, 5.0 ];
+	mask = [ 0, 0, 0, 0 ];
+	v = mskrange( [ vector( x, x.length, 1, 0 ), vector( mask, mask.length, 1, 0 ) ] );
+	t.strictEqual( isnan( v ), true, 'returns expected value' );
+
+	x = [ NaN ];
+	mask = [ 0 ];
+	v = mskrange( [ vector( x, x.length, 1, 0 ), vector( mask, mask.length, 1, 0 ) ] );
+	t.strictEqual( isnan( v ), true, 'returns expected value' );
+
+	x = [ NaN ];
+	mask = [ 1 ];
+	v = mskrange( [ vector( x, x.length, 1, 0 ), vector( mask, mask.length, 1, 0 ) ] );
+	t.strictEqual( isnan( v ), true, 'returns expected value' );
+
+	x = [ NaN, NaN ];
+	mask = [ 1, 1 ];
+	v = mskrange( [ vector( x, x.length, 1, 0 ), vector( mask, mask.length, 1, 0 ) ] );
+	t.strictEqual( isnan( v ), true, 'returns expected value' );
+
+	x = [ NaN, NaN ];
+	mask = [ 1, 0 ];
+	v = mskrange( [ vector( x, x.length, 1, 0 ), vector( mask, mask.length, 1, 0 ) ] );
+	t.strictEqual( isnan( v ), true, 'returns expected value' );
+
+	x = [ NaN, NaN ];
+	mask = [ 0, 1 ];
+	v = mskrange( [ vector( x, x.length, 1, 0 ), vector( mask, mask.length, 1, 0 ) ] );
+	t.strictEqual( isnan( v ), true, 'returns expected value' );
+
+	x = [ NaN, NaN ];
+	mask = [ 0, 0 ];
+	v = mskrange( [ vector( x, x.length, 1, 0 ), vector( mask, mask.length, 1, 0 ) ] );
+	t.strictEqual( isnan( v ), true, 'returns expected value' );
+
+	t.end();
+});
+
+tape( 'if provided an empty ndarray, the function returns `NaN`', function test( t ) {
+	var mask;
+	var x;
+	var v;
+
+	x = [];
+	mask = [];
+
+	v = mskrange( [ vector( x, 0, 1, 0 ), vector( mask, 0, 1, 0 ) ] );
+	t.strictEqual( isnan( v ), true, 'returns expected value' );
+
+	t.end();
+});
+
+tape( 'if provided an ndarray containing a single element, the function returns zero', function test( t ) {
+	var mask;
+	var x;
+	var v;
+
+	x = [ 1.0, -2.0, -4.0, 5.0, 3.0 ];
+	mask = [ 0, 0, 0, 0, 0 ];
+
+	v = mskrange( [ vector( x, 1, 1, 0 ), vector( mask, 1, 1, 0 ) ] );
+	t.strictEqual( v, 0.0, 'returns expected value' );
+
+	t.end();
+});
+
+tape( 'the function supports one-dimensional ndarrays having non-unit strides', function test( t ) {
+	var mask;
+	var x;
+	var v;
+
+	x = [
+		1.0,  // 0
+		2.0,
+		2.0,  // 1
+		-7.0,
+		-2.0, // 2
+		3.0,
+		4.0,  // 3
+		2.0,
+		5.0,  // 4
+		6.0
+	];
+	mask = [
+		0, // 0
+		0,
+		0, // 1
+		0,
+		0, // 2
+		0,
+		0, // 3
+		0,
+		1, // 4
+		1
+	];
+
+	v = mskrange( [ vector( x, 5, 2, 0 ), vector( mask, 5, 2, 0 ) ] );
+
+	t.strictEqual( v, 6.0, 'returns expected value' );
+	t.end();
+});
+
+tape( 'the function supports one-dimensional ndarrays having negative strides', function test( t ) {
+	var mask;
+	var x;
+	var v;
+
+	x = [
+		5.0,  // 4
+		6.0,
+		1.0,  // 3
+		2.0,
+		2.0,  // 2
+		-7.0,
+		-2.0, // 1
+		3.0,
+		4.0,  // 0
+		2.0
+	];
+	mask = [
+		1, // 4
+		1,
+		0, // 3
+		0,
+		0, // 2
+		0,
+		0, // 1
+		0,
+		0, // 0
+		0
+	];
+
+	v = mskrange( [ vector( x, 5, -2, 8 ), vector( mask, 5, -2, 8 ) ] );
+
+	t.strictEqual( v, 6.0, 'returns expected value' );
+	t.end();
+});
+
+tape( 'the function supports one-dimensional ndarrays having non-zero offsets', function test( t ) {
+	var mask;
+	var x;
+	var v;
+
+	x = [
+		2.0,
+		1.0,  // 0
+		2.0,
+		-2.0, // 1
+		-2.0,
+		2.0,  // 2
+		3.0,
+		4.0,  // 3
+		5.0,
+		6.0   // 4
+	];
+	mask = [
+		0,
+		0, // 0
+		0,
+		0, // 1
+		0,
+		0, // 2
+		0,
+		0, // 3
+		1,
+		1  // 4
+	];
+
+	v = mskrange( [ vector( x, 5, 2, 1 ), vector( mask, 5, 2, 1 ) ] );
+	t.strictEqual( v, 6.0, 'returns expected value' );
+
+	t.end();
+});

From a97d03c37c4d7c534558cb53950e0cfcc3f8d975 Mon Sep 17 00:00:00 2001
From: iampratik13 <bhagwatpratik781@gmail.com>
Date: Sun, 30 Nov 2025 01:45:07 +0530
Subject: [PATCH 2/8] docs: add missing reference

---
 .../@stdlib/stats/base/ndarray/mskrange/README.md             | 2 ++
 .../@stdlib/stats/base/ndarray/mskrange/lib/index.js          | 4 ++--
 2 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/lib/node_modules/@stdlib/stats/base/ndarray/mskrange/README.md b/lib/node_modules/@stdlib/stats/base/ndarray/mskrange/README.md
index 927d470a3f70..5820905e8752 100644
--- a/lib/node_modules/@stdlib/stats/base/ndarray/mskrange/README.md
+++ b/lib/node_modules/@stdlib/stats/base/ndarray/mskrange/README.md
@@ -118,6 +118,8 @@ console.log( v );
 
 <section class="links">
 
+[range]: https://en.wikipedia.org/wiki/Range_%28statistics%29
+
 </section>
 
 <!-- /.links -->
diff --git a/lib/node_modules/@stdlib/stats/base/ndarray/mskrange/lib/index.js b/lib/node_modules/@stdlib/stats/base/ndarray/mskrange/lib/index.js
index 18ee2f543b38..bdd88059a226 100644
--- a/lib/node_modules/@stdlib/stats/base/ndarray/mskrange/lib/index.js
+++ b/lib/node_modules/@stdlib/stats/base/ndarray/mskrange/lib/index.js
@@ -30,11 +30,11 @@
 * var xbuf = [ 1.0, -2.0, 4.0, 2.0 ];
 * var x = new ndarray( 'generic', xbuf, [ 4 ], [ 1 ], 0, 'row-major' );
 *
-* var mbuf = [ 0, 0, 1, 0 ];
+* var mbuf = [ 0, 0, 1, 0 ]; // eslint-disable-line @cspell/spellchecker
 * var mask = new ndarray( 'generic', mbuf, [ 4 ], [ 1 ], 0, 'row-major' );
 *
 * var v = mskrange( [ x, mask ] );
-* // returns 2.0
+* // returns 4.0
 */
 
 // MODULES //

From d1b498692c481aac11dfaa42126a41438fca0722 Mon Sep 17 00:00:00 2001
From: Athan <kgryte@gmail.com>
Date: Sat, 29 Nov 2025 12:57:28 -0800
Subject: [PATCH 3/8] docs: update intro

Signed-off-by: Athan <kgryte@gmail.com>
---
 lib/node_modules/@stdlib/stats/base/ndarray/mskrange/README.md | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/lib/node_modules/@stdlib/stats/base/ndarray/mskrange/README.md b/lib/node_modules/@stdlib/stats/base/ndarray/mskrange/README.md
index 5820905e8752..06d89a0d4212 100644
--- a/lib/node_modules/@stdlib/stats/base/ndarray/mskrange/README.md
+++ b/lib/node_modules/@stdlib/stats/base/ndarray/mskrange/README.md
@@ -24,6 +24,8 @@ limitations under the License.
 
 <section class="intro">
 
+The [**range**][range] is defined as the difference between the maximum and minimum values.
+
 </section>
 
 <!-- /.intro -->

From bfff98b895f298885d3429eaf39a99bdd434dddc Mon Sep 17 00:00:00 2001
From: Athan <kgryte@gmail.com>
Date: Sat, 29 Nov 2025 12:59:21 -0800
Subject: [PATCH 4/8] docs: update dtype in example

Signed-off-by: Athan <kgryte@gmail.com>
---
 lib/node_modules/@stdlib/stats/base/ndarray/mskrange/README.md | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/node_modules/@stdlib/stats/base/ndarray/mskrange/README.md b/lib/node_modules/@stdlib/stats/base/ndarray/mskrange/README.md
index 06d89a0d4212..ef25c75b4359 100644
--- a/lib/node_modules/@stdlib/stats/base/ndarray/mskrange/README.md
+++ b/lib/node_modules/@stdlib/stats/base/ndarray/mskrange/README.md
@@ -97,7 +97,7 @@ console.log( ndarray2array( x ) );
 var maskbuf = bernoulli( xbuf.length, 0.2, {
     'dtype': 'uint8'
 });
-var mask = new ndarray( 'generic', maskbuf, [ maskbuf.length ], [ 1 ], 0, 'row-major' );
+var mask = new ndarray( 'uint8', maskbuf, [ maskbuf.length ], [ 1 ], 0, 'row-major' );
 console.log( ndarray2array( mask ) );
 
 var v = mskrange( [ x, mask ] );

From f598a84e463954855bfb962cb6388b94b6c8f7c0 Mon Sep 17 00:00:00 2001
From: Athan <kgryte@gmail.com>
Date: Sat, 29 Nov 2025 13:00:31 -0800
Subject: [PATCH 5/8] style: fix line wrapping

Signed-off-by: Athan <kgryte@gmail.com>
---
 .../@stdlib/stats/base/ndarray/mskrange/docs/repl.txt          | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/lib/node_modules/@stdlib/stats/base/ndarray/mskrange/docs/repl.txt b/lib/node_modules/@stdlib/stats/base/ndarray/mskrange/docs/repl.txt
index 4b4ed992437f..60370a079b37 100644
--- a/lib/node_modules/@stdlib/stats/base/ndarray/mskrange/docs/repl.txt
+++ b/lib/node_modules/@stdlib/stats/base/ndarray/mskrange/docs/repl.txt
@@ -1,7 +1,6 @@
 
 {{alias}}( arrays )
-    Calculates the range of a one-dimensional ndarray according to a
-    mask.
+    Calculates the range of a one-dimensional ndarray according to a mask.
 
     If provided an empty ndarray or a mask with all elements set to `1`, the
     function returns `NaN`.

From 58d0ae3d0b35d0f474a2fda5594764460bc93189 Mon Sep 17 00:00:00 2001
From: Athan <kgryte@gmail.com>
Date: Sat, 29 Nov 2025 13:02:53 -0800
Subject: [PATCH 6/8] Apply suggestions from code review

Signed-off-by: Athan <kgryte@gmail.com>
---
 .../@stdlib/stats/base/ndarray/mskrange/examples/index.js     | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/lib/node_modules/@stdlib/stats/base/ndarray/mskrange/examples/index.js b/lib/node_modules/@stdlib/stats/base/ndarray/mskrange/examples/index.js
index ab6f0319f4e3..129c53b93005 100644
--- a/lib/node_modules/@stdlib/stats/base/ndarray/mskrange/examples/index.js
+++ b/lib/node_modules/@stdlib/stats/base/ndarray/mskrange/examples/index.js
@@ -25,7 +25,7 @@ var ndarray2array = require( '@stdlib/ndarray/to-array' );
 var mskrange = require( './../lib' );
 
 var xbuf = uniform( 10, -50.0, 50.0, {
-	'dtype': 'float64'
+	'dtype': 'generic'
 });
 var x = new ndarray( 'generic', xbuf, [ xbuf.length ], [ 1 ], 0, 'row-major' );
 console.log( ndarray2array( x ) );
@@ -33,7 +33,7 @@ console.log( ndarray2array( x ) );
 var maskbuf = bernoulli( xbuf.length, 0.2, {
 	'dtype': 'uint8'
 });
-var mask = new ndarray( 'generic', maskbuf, [ maskbuf.length ], [ 1 ], 0, 'row-major' );
+var mask = new ndarray( 'uint8', maskbuf, [ maskbuf.length ], [ 1 ], 0, 'row-major' );
 console.log( ndarray2array( mask ) );
 
 var v = mskrange( [ x, mask ] );

From c4b4320d7fe7501b6bcd313498b58c643bd8a406 Mon Sep 17 00:00:00 2001
From: Athan <kgryte@gmail.com>
Date: Sat, 29 Nov 2025 13:03:16 -0800
Subject: [PATCH 7/8] docs: fix dtype

Signed-off-by: Athan <kgryte@gmail.com>
---
 lib/node_modules/@stdlib/stats/base/ndarray/mskrange/README.md | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/node_modules/@stdlib/stats/base/ndarray/mskrange/README.md b/lib/node_modules/@stdlib/stats/base/ndarray/mskrange/README.md
index ef25c75b4359..dfe155dc27e8 100644
--- a/lib/node_modules/@stdlib/stats/base/ndarray/mskrange/README.md
+++ b/lib/node_modules/@stdlib/stats/base/ndarray/mskrange/README.md
@@ -89,7 +89,7 @@ var ndarray2array = require( '@stdlib/ndarray/to-array' );
 var mskrange = require( '@stdlib/stats/base/ndarray/mskrange' );
 
 var xbuf = uniform( 10, -50.0, 50.0, {
-    'dtype': 'float64'
+    'dtype': 'generic'
 });
 var x = new ndarray( 'generic', xbuf, [ xbuf.length ], [ 1 ], 0, 'row-major' );
 console.log( ndarray2array( x ) );

From 11916a43aed0f6b1ae06d70d1517d9afd157d3de Mon Sep 17 00:00:00 2001
From: Athan <kgryte@gmail.com>
Date: Sat, 29 Nov 2025 13:03:56 -0800
Subject: [PATCH 8/8] docs: remove comment

Signed-off-by: Athan <kgryte@gmail.com>
---
 .../@stdlib/stats/base/ndarray/mskrange/lib/index.js            | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/node_modules/@stdlib/stats/base/ndarray/mskrange/lib/index.js b/lib/node_modules/@stdlib/stats/base/ndarray/mskrange/lib/index.js
index bdd88059a226..501cf6da6fd0 100644
--- a/lib/node_modules/@stdlib/stats/base/ndarray/mskrange/lib/index.js
+++ b/lib/node_modules/@stdlib/stats/base/ndarray/mskrange/lib/index.js
@@ -30,7 +30,7 @@
 * var xbuf = [ 1.0, -2.0, 4.0, 2.0 ];
 * var x = new ndarray( 'generic', xbuf, [ 4 ], [ 1 ], 0, 'row-major' );
 *
-* var mbuf = [ 0, 0, 1, 0 ]; // eslint-disable-line @cspell/spellchecker
+* var mbuf = [ 0, 0, 1, 0 ];
 * var mask = new ndarray( 'generic', mbuf, [ 4 ], [ 1 ], 0, 'row-major' );
 *
 * var v = mskrange( [ x, mask ] );