From 9d42a6bf9a4eb4bd9165e0aaf9547b36c17b8f42 Mon Sep 17 00:00:00 2001
From: Benjamin <benjamin2025business@gmail.com>
Date: Fri, 2 Oct 2026 12:35:26 +0200
Subject: [PATCH] feat: add blas/ext/base/ndarray/gnancount

Provide the maintainer-requested ndarray interface for counting non-NaN values. Honor selected shape, stride and offset using the existing strided implementation, with declarations, examples and regression coverage.

Assisted-by: OpenAI Codex
---
 .../blas/ext/base/ndarray/gnancount/README.md | 109 +++++++++++
 .../ndarray/gnancount/benchmark/benchmark.js  | 108 +++++++++++
 .../ext/base/ndarray/gnancount/docs/repl.txt  |  25 +++
 .../ndarray/gnancount/docs/types/index.d.ts   |  50 +++++
 .../base/ndarray/gnancount/docs/types/test.ts |  66 +++++++
 .../base/ndarray/gnancount/examples/index.js  |  30 +++
 .../ext/base/ndarray/gnancount/lib/index.js   |  43 +++++
 .../ext/base/ndarray/gnancount/lib/main.js    |  60 ++++++
 .../ext/base/ndarray/gnancount/package.json   |  66 +++++++
 .../ext/base/ndarray/gnancount/test/test.js   | 179 ++++++++++++++++++
 10 files changed, 736 insertions(+)
 create mode 100644 lib/node_modules/@stdlib/blas/ext/base/ndarray/gnancount/README.md
 create mode 100644 lib/node_modules/@stdlib/blas/ext/base/ndarray/gnancount/benchmark/benchmark.js
 create mode 100644 lib/node_modules/@stdlib/blas/ext/base/ndarray/gnancount/docs/repl.txt
 create mode 100644 lib/node_modules/@stdlib/blas/ext/base/ndarray/gnancount/docs/types/index.d.ts
 create mode 100644 lib/node_modules/@stdlib/blas/ext/base/ndarray/gnancount/docs/types/test.ts
 create mode 100644 lib/node_modules/@stdlib/blas/ext/base/ndarray/gnancount/examples/index.js
 create mode 100644 lib/node_modules/@stdlib/blas/ext/base/ndarray/gnancount/lib/index.js
 create mode 100644 lib/node_modules/@stdlib/blas/ext/base/ndarray/gnancount/lib/main.js
 create mode 100644 lib/node_modules/@stdlib/blas/ext/base/ndarray/gnancount/package.json
 create mode 100644 lib/node_modules/@stdlib/blas/ext/base/ndarray/gnancount/test/test.js

diff --git a/lib/node_modules/@stdlib/blas/ext/base/ndarray/gnancount/README.md b/lib/node_modules/@stdlib/blas/ext/base/ndarray/gnancount/README.md
new file mode 100644
index 000000000000..10654cb56804
--- /dev/null
+++ b/lib/node_modules/@stdlib/blas/ext/base/ndarray/gnancount/README.md
@@ -0,0 +1,109 @@
+<!--
+
+@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.
+
+-->
+
+# gnancount
+
+> Count the number of non-`NaN` elements in a one-dimensional ndarray.
+
+<section class="intro">
+
+</section>
+
+<!-- /.intro -->
+
+<section class="usage">
+
+## Usage
+
+```javascript
+var gnancount = require( '@stdlib/blas/ext/base/ndarray/gnancount' );
+```
+
+#### gnancount( arrays )
+
+Counts the number of non-`NaN` elements in a one-dimensional ndarray.
+
+```javascript
+var vector = require( '@stdlib/ndarray/vector/ctor' );
+
+var x = vector( [ 1.0, NaN, 4.0, NaN ], 'generic' );
+
+var v = gnancount( [ x ] );
+// returns 2
+```
+
+The function has the following parameters:
+
+-   **arrays**: array-like object containing a one-dimensional input ndarray.
+
+</section>
+
+<!-- /.usage -->
+
+<section class="notes">
+
+## Notes
+
+-   If provided an empty one-dimensional ndarray, the function returns `0`.
+-   The function supports arbitrary strides and offsets, including negative and zero strides.
+-   The function supports input ndarrays whose underlying data buffers use accessor protocols.
+
+</section>
+
+<!-- /.notes -->
+
+<section class="examples">
+
+## Examples
+
+<!-- eslint no-undef: "error" -->
+
+```javascript
+var vector = require( '@stdlib/ndarray/vector/ctor' );
+var ndarray2array = require( '@stdlib/ndarray/to-array' );
+var gnancount = require( '@stdlib/blas/ext/base/ndarray/gnancount' );
+
+var x = vector( [ 1.0, NaN, -2.0, NaN, 3.0 ], 'generic' );
+console.log( ndarray2array( x ) );
+
+var v = gnancount( [ x ] );
+console.log( v );
+// => 3
+```
+
+</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/blas/ext/base/ndarray/gnancount/benchmark/benchmark.js b/lib/node_modules/@stdlib/blas/ext/base/ndarray/gnancount/benchmark/benchmark.js
new file mode 100644
index 000000000000..afd674cb9c11
--- /dev/null
+++ b/lib/node_modules/@stdlib/blas/ext/base/ndarray/gnancount/benchmark/benchmark.js
@@ -0,0 +1,108 @@
+/**
+* @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 uniform = require( '@stdlib/random/uniform' );
+var pow = require( '@stdlib/math/base/special/pow' );
+var format = require( '@stdlib/string/format' );
+var pkg = require( './../package.json' ).name;
+var gnancount = 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 x;
+	var i;
+
+	x = uniform( [ len ], -10.0, 10.0, options );
+	for ( i = 0; i < len; i += 2 ) {
+		x.set( i, NaN );
+	}
+	return benchmark;
+
+	/**
+	* Benchmark function.
+	*
+	* @private
+	* @param {Benchmark} b - benchmark instance
+	*/
+	function benchmark( b ) {
+		var v;
+		var i;
+
+		b.tic();
+		for ( i = 0; i < b.iterations; i++ ) {
+			v = gnancount( [ x ] );
+			if ( v !== len/2 ) {
+				b.fail( 'should return expected count' );
+			}
+		}
+		b.toc();
+		if ( v !== len/2 ) {
+			b.fail( 'should return expected count' );
+		}
+		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:len=%d', pkg, len ), f );
+	}
+}
+
+main();
diff --git a/lib/node_modules/@stdlib/blas/ext/base/ndarray/gnancount/docs/repl.txt b/lib/node_modules/@stdlib/blas/ext/base/ndarray/gnancount/docs/repl.txt
new file mode 100644
index 000000000000..29f7ad13dcf1
--- /dev/null
+++ b/lib/node_modules/@stdlib/blas/ext/base/ndarray/gnancount/docs/repl.txt
@@ -0,0 +1,25 @@
+
+{{alias}}( arrays )
+    Counts the number of non-NaN elements in a one-dimensional ndarray.
+
+    If provided an empty ndarray, the function returns `0`.
+
+    Parameters
+    ----------
+    arrays: ArrayLikeObject<ndarray>
+        Array-like object containing a one-dimensional input ndarray.
+
+    Returns
+    -------
+    out: number
+        Count.
+
+    Examples
+    --------
+    > var vector = {{alias:@stdlib/ndarray/vector/ctor}};
+    > var x = vector( [ 1.0, NaN, 3.0 ], 'generic' );
+    > {{alias}}( [ x ] )
+    2
+
+    See Also
+    --------
diff --git a/lib/node_modules/@stdlib/blas/ext/base/ndarray/gnancount/docs/types/index.d.ts b/lib/node_modules/@stdlib/blas/ext/base/ndarray/gnancount/docs/types/index.d.ts
new file mode 100644
index 000000000000..1820e1c64add
--- /dev/null
+++ b/lib/node_modules/@stdlib/blas/ext/base/ndarray/gnancount/docs/types/index.d.ts
@@ -0,0 +1,50 @@
+/*
+* @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.
+*/
+
+// TypeScript Version: 4.1
+
+/// <reference types="@stdlib/types"/>
+
+import { typedndarray } from '@stdlib/types/ndarray';
+
+/**
+* Counts the number of non-`NaN` elements in a one-dimensional ndarray.
+*
+* ## Notes
+*
+* -   The function expects the following ndarrays:
+*
+*     -   a one-dimensional input ndarray.
+*
+* @param arrays - array-like object containing ndarrays
+* @returns count
+*
+* @example
+* var vector = require( '@stdlib/ndarray/vector/ctor' );
+*
+* var x = vector( [ 1.0, NaN, 4.0, NaN ], 'generic' );
+*
+* var v = gnancount( [ x ] );
+* // returns 2
+*/
+declare function gnancount<T extends typedndarray<number> = typedndarray<number>>( arrays: [ T ] ): number;
+
+
+// EXPORTS //
+
+export = gnancount;
diff --git a/lib/node_modules/@stdlib/blas/ext/base/ndarray/gnancount/docs/types/test.ts b/lib/node_modules/@stdlib/blas/ext/base/ndarray/gnancount/docs/types/test.ts
new file mode 100644
index 000000000000..e2309b364185
--- /dev/null
+++ b/lib/node_modules/@stdlib/blas/ext/base/ndarray/gnancount/docs/types/test.ts
@@ -0,0 +1,66 @@
+/*
+* @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.
+*/
+
+/* eslint-disable space-in-parens */
+
+import zeros = require( '@stdlib/ndarray/zeros' );
+import gnancount = require( './index' );
+
+
+// TESTS //
+
+// The function returns a number...
+{
+	const x = zeros( [ 10 ], {
+		'dtype': 'float64'
+	});
+
+	gnancount( [ x ] ); // $ExpectType number
+
+	const y = zeros( [ 10 ], {
+		'dtype': 'generic'
+	});
+	gnancount( [ y ] ); // $ExpectType number
+}
+
+// The compiler throws an error if the function is provided a first argument which is not an array of ndarrays...
+{
+	gnancount( '10' ); // $ExpectError
+	gnancount( 10 ); // $ExpectError
+	gnancount( true ); // $ExpectError
+	gnancount( false ); // $ExpectError
+	gnancount( null ); // $ExpectError
+	gnancount( undefined ); // $ExpectError
+	gnancount( [] ); // $ExpectError
+	gnancount( {} ); // $ExpectError
+	gnancount( ( 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': 'float64'
+	});
+
+	gnancount( x ); // $ExpectError
+	gnancount( [ x, x ] ); // $ExpectError
+	gnancount( [ [ 1, 2, 3 ] ] ); // $ExpectError
+
+	gnancount(); // $ExpectError
+	gnancount( [ x ], {} ); // $ExpectError
+}
diff --git a/lib/node_modules/@stdlib/blas/ext/base/ndarray/gnancount/examples/index.js b/lib/node_modules/@stdlib/blas/ext/base/ndarray/gnancount/examples/index.js
new file mode 100644
index 000000000000..768b79723ac2
--- /dev/null
+++ b/lib/node_modules/@stdlib/blas/ext/base/ndarray/gnancount/examples/index.js
@@ -0,0 +1,30 @@
+/**
+* @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';
+
+var vector = require( '@stdlib/ndarray/vector/ctor' );
+var ndarray2array = require( '@stdlib/ndarray/to-array' );
+var gnancount = require( './../lib' );
+
+var x = vector( [ 1.0, NaN, -2.0, NaN, 3.0 ], 'generic' );
+console.log( ndarray2array( x ) );
+
+var v = gnancount( [ x ] );
+console.log( v );
+// => 3
diff --git a/lib/node_modules/@stdlib/blas/ext/base/ndarray/gnancount/lib/index.js b/lib/node_modules/@stdlib/blas/ext/base/ndarray/gnancount/lib/index.js
new file mode 100644
index 000000000000..22d506ca7f19
--- /dev/null
+++ b/lib/node_modules/@stdlib/blas/ext/base/ndarray/gnancount/lib/index.js
@@ -0,0 +1,43 @@
+/**
+* @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';
+
+/**
+* Count the number of non-`NaN` elements in a one-dimensional ndarray.
+*
+* @module @stdlib/blas/ext/base/ndarray/gnancount
+*
+* @example
+* var vector = require( '@stdlib/ndarray/vector/ctor' );
+* var gnancount = require( '@stdlib/blas/ext/base/ndarray/gnancount' );
+*
+* var x = vector( [ 1.0, NaN, 4.0, NaN ], 'generic' );
+*
+* var v = gnancount( [ x ] );
+* // returns 2
+*/
+
+// MODULES //
+
+var main = require( './main.js' );
+
+
+// EXPORTS //
+
+module.exports = main;
diff --git a/lib/node_modules/@stdlib/blas/ext/base/ndarray/gnancount/lib/main.js b/lib/node_modules/@stdlib/blas/ext/base/ndarray/gnancount/lib/main.js
new file mode 100644
index 000000000000..85f49567dbc1
--- /dev/null
+++ b/lib/node_modules/@stdlib/blas/ext/base/ndarray/gnancount/lib/main.js
@@ -0,0 +1,60 @@
+/**
+* @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 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/blas/ext/base/gnancount' ).ndarray;
+
+
+// MAIN //
+
+/**
+* Counts the number of non-`NaN` elements in a one-dimensional ndarray.
+*
+* ## Notes
+*
+* -   The function expects the following ndarrays:
+*
+*     -   a one-dimensional input ndarray.
+*
+* @param {ArrayLikeObject<Object>} arrays - array-like object containing ndarrays
+* @returns {NonNegativeInteger} count
+*
+* @example
+* var vector = require( '@stdlib/ndarray/vector/ctor' );
+*
+* var x = vector( [ 1.0, NaN, 4.0, NaN ], 'generic' );
+*
+* var v = gnancount( [ x ] );
+* // returns 2
+*/
+function gnancount( arrays ) {
+	var x = arrays[ 0 ];
+	return strided( numelDimension( x, 0 ), getData( x ), getStride( x, 0 ), getOffset( x ) ); // eslint-disable-line max-len
+}
+
+
+// EXPORTS //
+
+module.exports = gnancount;
diff --git a/lib/node_modules/@stdlib/blas/ext/base/ndarray/gnancount/package.json b/lib/node_modules/@stdlib/blas/ext/base/ndarray/gnancount/package.json
new file mode 100644
index 000000000000..9369882fc792
--- /dev/null
+++ b/lib/node_modules/@stdlib/blas/ext/base/ndarray/gnancount/package.json
@@ -0,0 +1,66 @@
+{
+  "name": "@stdlib/blas/ext/base/ndarray/gnancount",
+  "version": "0.0.0",
+  "description": "Count the number of non-NaN elements in a one-dimensional ndarray.",
+  "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",
+    "blas",
+    "extended",
+    "count",
+    "nan",
+    "number",
+    "ndarray"
+  ],
+  "__stdlib__": {}
+}
diff --git a/lib/node_modules/@stdlib/blas/ext/base/ndarray/gnancount/test/test.js b/lib/node_modules/@stdlib/blas/ext/base/ndarray/gnancount/test/test.js
new file mode 100644
index 000000000000..a4a1b7826525
--- /dev/null
+++ b/lib/node_modules/@stdlib/blas/ext/base/ndarray/gnancount/test/test.js
@@ -0,0 +1,179 @@
+/**
+* @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 tape = require( 'tape' );
+var toAccessorArray = require( '@stdlib/array/base/to-accessor-array' );
+var Float64Array = require( '@stdlib/array/float64' );
+var ndarray = require( '@stdlib/ndarray/base/ctor' );
+var gnancount = 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 gnancount, 'function', 'main export is a function' );
+	t.end();
+});
+
+tape( 'the function has an arity of 1', function test( t ) {
+	t.strictEqual( gnancount.length, 1, 'has expected arity' );
+	t.end();
+});
+
+tape( 'the function counts the number of non-`NaN` elements in a one-dimensional ndarray', function test( t ) {
+	var x;
+	var v;
+
+	x = [ 1.0, NaN, -2.0, NaN, 0.0, -0.0, Infinity, -Infinity ];
+	v = gnancount( [ vector( x, x.length, 1, 0 ) ] );
+	t.strictEqual( v, 6, 'returns expected value' );
+
+	x = [ NaN, NaN ];
+	v = gnancount( [ vector( x, x.length, 1, 0 ) ] );
+	t.strictEqual( v, 0, 'returns expected value' );
+
+	x = [ -4.0, 5.0 ];
+	v = gnancount( [ vector( x, x.length, 1, 0 ) ] );
+	t.strictEqual( v, 2, 'returns expected value' );
+
+	t.end();
+});
+
+tape( 'if provided an empty ndarray, the function returns `0`', function test( t ) {
+	var x;
+
+	x = vector( [], 0, 1, 0 );
+	t.strictEqual( gnancount( [ x ] ), 0, 'returns expected value' );
+
+	x = vector( [ 1.0, 2.0 ], 0, 1, 1 );
+	t.strictEqual( gnancount( [ x ] ), 0, 'returns expected value' );
+
+	t.end();
+});
+
+tape( 'the function supports one-dimensional ndarrays containing a single element', function test( t ) {
+	var x;
+
+	x = vector( [ 1.0 ], 1, 1, 0 );
+	t.strictEqual( gnancount( [ x ] ), 1, 'returns expected value' );
+
+	x = vector( [ NaN ], 1, 1, 0 );
+	t.strictEqual( gnancount( [ x ] ), 0, 'returns expected value' );
+
+	t.end();
+});
+
+tape( 'the function supports one-dimensional ndarrays having non-unit strides', function test( t ) {
+	var x;
+
+	x = [ 1.0, NaN, 2.0, NaN, 3.0, NaN, 4.0 ];
+	t.strictEqual( gnancount( [ vector( x, 4, 2, 0 ) ] ), 4, 'returns expected value' );
+
+	x = [ NaN, 1.0, NaN, 2.0, NaN, 3.0, NaN ];
+	t.strictEqual( gnancount( [ vector( x, 4, 2, 0 ) ] ), 0, 'returns expected value' );
+
+	t.end();
+});
+
+tape( 'the function supports one-dimensional ndarrays having negative strides', function test( t ) {
+	var x;
+
+	x = [ NaN, 1.0, NaN, 2.0, NaN, 3.0, NaN ];
+	t.strictEqual( gnancount( [ vector( x, 3, -2, 5 ) ] ), 3, 'returns expected value' );
+	t.strictEqual( gnancount( [ vector( x, 4, -2, 6 ) ] ), 0, 'returns expected value' );
+
+	t.end();
+});
+
+tape( 'the function supports one-dimensional ndarrays having non-zero offsets', function test( t ) {
+	var x;
+
+	x = [ 42.0, NaN, 1.0, NaN, NaN, 99.0 ];
+	t.strictEqual( gnancount( [ vector( x, 3, 1, 1 ) ] ), 1, 'returns expected value' );
+	t.strictEqual( gnancount( [ vector( x, 2, 2, 1 ) ] ), 0, 'returns expected value' );
+
+	t.end();
+});
+
+tape( 'the function supports one-dimensional ndarrays having zero strides', function test( t ) {
+	var x;
+
+	x = [ NaN, 1.0 ];
+	t.strictEqual( gnancount( [ vector( x, 5, 0, 1 ) ] ), 5, 'returns expected value' );
+	t.strictEqual( gnancount( [ vector( x, 5, 0, 0 ) ] ), 0, 'returns expected value' );
+
+	t.end();
+});
+
+tape( 'the function supports one-dimensional ndarrays having typed array buffers', function test( t ) {
+	var x;
+
+	x = new Float64Array( [ NaN, 1.0, NaN, 2.0, NaN ] );
+	x = new ndarray( 'float64', x, [ 2 ], [ 2 ], 1, 'row-major' );
+	t.strictEqual( gnancount( [ x ] ), 2, 'returns expected value' );
+
+	t.end();
+});
+
+tape( 'the function supports one-dimensional ndarrays having accessor array buffers', function test( t ) {
+	var x;
+
+	x = toAccessorArray( [ NaN, 1.0, NaN, 2.0, NaN, 3.0, NaN ] );
+	t.strictEqual( gnancount( [ vector( x, 7, 1, 0 ) ] ), 3, 'returns expected value' );
+	t.strictEqual( gnancount( [ vector( x, 3, 2, 1 ) ] ), 3, 'returns expected value' );
+	t.strictEqual( gnancount( [ vector( x, 3, -2, 5 ) ] ), 3, 'returns expected value' );
+	t.strictEqual( gnancount( [ vector( x, 4, -2, 6 ) ] ), 0, 'returns expected value' );
+	t.strictEqual( gnancount( [ vector( x, 5, 0, 1 ) ] ), 5, 'returns expected value' );
+	t.strictEqual( gnancount( [ vector( x, 5, 0, 0 ) ] ), 0, 'returns expected value' );
+	t.strictEqual( gnancount( [ vector( x, 0, 1, 0 ) ] ), 0, 'returns expected value' );
+
+	t.end();
+});
+
+tape( 'the function supports an array-like object containing the input ndarray', function test( t ) {
+	var arrays;
+
+	arrays = {
+		'0': vector( [ 1.0, NaN, 2.0 ], 3, 1, 0 ),
+		'length': 1
+	};
+	t.strictEqual( gnancount( arrays ), 2, 'returns expected value' );
+	t.end();
+});