feat: add remaining implementation for number/float64/base/ulp-difference

lib/node_modules/@stdlib/number/float64/base/ulp-difference/README.md

@@ -0,0 +1,146 @@
+<!--
+
+@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.
+
+-->
+
+# ulpdiff
+
+> Compute the number of representable [double-precision][double-precision] floating-point values that separate two [double-precision][double-precision] floating-point numbers along the real number line.
+
+<!-- Section to include introductory text. Make sure to keep an empty line after the intro `section` element and another before the `/section` close. -->
+
+<section class="intro">
+
+</section>
+
+<!-- /.intro -->
+
+<!-- Package usage documentation. -->
+
+<section class="usage">
+
+## Usage
+
+```javascript
+var ulpdiff = require( '@stdlib/number/float64/base/ulp-difference' );
+```
+
+#### ulpdiff( x, y )
+
+Computes the number of representable [double-precision][double-precision] floating-point values that separate two [double-precision][double-precision] floating-point numbers along the real number line.
+
+```javascript
+var EPS = require( '@stdlib/constants/float64/eps' );
+
+var d = ulpdiff( 1.0, 1.0+EPS );
+// returns 1.0
+
+d = ulpdiff( 1.0+EPS, 1.0 );
+// returns 1.0
+
+d = ulpdiff( 1.0, 1.0+EPS+EPS );
+// returns 2.0
+
+d = ulpdiff( 1.0, NaN );
+// returns NaN
+
+d = ulpdiff( NaN, 1.0 );
+// returns NaN
+
+d = ulpdiff( NaN, NaN );
+// returns NaN
+```
+
+</section>
+
+<!-- /.usage -->
+
+<!-- Package usage notes. Make sure to keep an empty line after the `section` element and another before the `/section` close. -->
+
+<section class="notes">
+
+## Notes
+
+-   Adjacent [double-precision][double-precision] floating-point numbers differ by `1` [ulp][ulp] (unit in the last place).
+-   Signed zeros differ only in the sign bit but are considered numerically equal, and thus their ULP difference is `0`.
+
+</section>
+
+<!-- /.notes -->
+
+<!-- Package usage examples. -->
+
+<section class="examples">
+
+## Examples
+
+<!-- eslint no-undef: "error" -->
+
+```javascript
+var EPS = require( '@stdlib/constants/float64/eps' );
+var SMALLEST_SUBNORMAL = require( '@stdlib/constants/float64/smallest-subnormal' );
+var ulpdiff = require( '@stdlib/number/float64/base/ulp-difference' );
+
+var d = ulpdiff( 1.0, 1.0+EPS );
+console.log( d );
+// => 1.0
+
+d = ulpdiff( 5.8364e-319, 5.8367e-319 );
+console.log( d );
+// => 6.0
+
+d = ulpdiff( 0.0, SMALLEST_SUBNORMAL );
+console.log( d );
+// => 1.0
+
+d = ulpdiff( 0.0, -0.0 );
+console.log( d );
+// => 0.0
+
+d = ulpdiff( SMALLEST_SUBNORMAL, -SMALLEST_SUBNORMAL );
+console.log( d );
+// => 2.0
+```
+
+</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">
+
+[double-precision]: https://en.wikipedia.org/wiki/Double-precision_floating-point_format
+
+[ulp]: https://en.wikipedia.org/wiki/Unit_in_the_last_place
+
+<!-- <related-links> -->
+
+<!-- </related-links> -->
+
+</section>
+
+<!-- /.links -->

lib/node_modules/@stdlib/number/float64/base/ulp-difference/benchmark/benchmark.js

@@ -0,0 +1,53 @@
+/**
+* @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 isnan = require( '@stdlib/math/base/assert/is-nan' );
+var pkg = require( './../package.json' ).name;
+var ulpdiff = require( './../lib' );
+
+
+// MAIN //
+
+bench( pkg, function benchmark( b ) {
+	var x;
+	var y;
+	var i;
+
+	x = uniform( 100, -500.0, 500.0 );
+	y = uniform( 100, -500.0, 500.0 );
+
+	b.tic();
+	for ( i = 0; i < b.iterations; i++ ) {
+		y = ulpdiff( x[ i%x.length ], y[ i%y.length ] );
+		if ( isnan( y ) ) {
+			b.fail( 'should not return NaN' );
+		}
+	}
+	b.toc();
+	if ( isnan( y ) ) {
+		b.fail( 'should not return NaN' );
+	}
+	b.pass( 'benchmark finished' );
+	b.end();
+});

lib/node_modules/@stdlib/number/float64/base/ulp-difference/docs/repl.txt

@@ -0,0 +1,45 @@
+
+{{alias}}( x, y )
+    Computes the number of representable double-precision floating-point values
+    that separate two double-precision floating-point numbers along the real
+    number line.
+
+    Adjacent double-precision floating-point numbers differ by 1 ulp (unit in
+    the last place).
+
+    Signed zeros differ only in the sign bit but are considered numerically
+    equal, and thus their ULP difference is 0.
+
+    If provided `NaN` as any argument, the function returns `NaN`.
+
+    Parameters
+    ----------
+    x: number
+        First input value.
+
+    y: number
+        Second input value.
+
+    Returns
+    -------
+    z: number
+        Result.
+
+    Examples
+    --------
+    > var v = {{alias}}( 1.0, 1.0+{{alias:@stdlib/constants/float64/eps}} )
+    1.0
+    > v = {{alias}}( 1.0+{{alias:@stdlib/constants/float64/eps}}, 1.0 )
+    1.0
+    > v = {{alias}}( 1.0, 1.0+{{alias:@stdlib/constants/float64/eps}}*2.0 )
+    2.0
+    > v = {{alias}}( 1.0, NaN )
+    NaN
+    > v = {{alias}}( NaN, 1.0 )
+    NaN
+    > v = {{alias}}( NaN, NaN )
+    NaN
+
+    See Also
+    --------
+

lib/node_modules/@stdlib/number/float64/base/ulp-difference/docs/types/index.d.ts

@@ -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.
+*/
+
+// TypeScript Version: 4.1
+
+/**
+* Computes the number of representable double-precision floating-point values that separate two double-precision floating-point numbers along the real number line.
+*
+* ## Notes
+*
+* -   Adjacent double-precision floating-point numbers differ by 1 ulp (unit in the last place).
+* -   Signed zeros differ only in the sign bit but are considered numerically equal, and thus their ULP difference is 0.
+*
+* @param x - first input value
+* @param y - second input value
+* @returns result
+*
+* @example
+* var EPS = require( '@stdlib/constants/float64/eps' );
+*
+* var d = ulpdiff( 1.0, 1.0+EPS );
+* // returns 1.0
+*
+* d = ulpdiff( 1.0+EPS, 1.0 );
+* // returns 1.0
+*
+* d = ulpdiff( 1.0, 1.0+EPS+EPS );
+* // returns 2.0
+*
+* d = ulpdiff( 1.0, NaN );
+* // returns NaN
+*
+* d = ulpdiff( NaN, 1.0 );
+* // returns NaN
+*
+* d = ulpdiff( NaN, NaN );
+* // returns NaN
+*/
+declare function ulpdiff( x: number, y: number ): number;
+
+
+// EXPORTS //
+
+export = ulpdiff;

lib/node_modules/@stdlib/number/float64/base/ulp-difference/docs/types/test.ts

@@ -0,0 +1,58 @@
+/*
+* @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.
+*/
+
+import ulpdiff = require( './index' );
+
+
+// TESTS //
+
+// The function returns a number...
+{
+	ulpdiff( 8.0, 8.0 ); // $ExpectType number
+}
+
+// The compiler throws an error if the function is provided a first argument which is not a number...
+{
+	ulpdiff( true, 5.0 ); // $ExpectError
+	ulpdiff( false, 5.0 ); // $ExpectError
+	ulpdiff( null, 5.0 ); // $ExpectError
+	ulpdiff( undefined, 5.0 ); // $ExpectError
+	ulpdiff( '5', 5.0 ); // $ExpectError
+	ulpdiff( [], 5.0 ); // $ExpectError
+	ulpdiff( {}, 5.0 ); // $ExpectError
+	ulpdiff( ( x: number ): number => x, 5.0 ); // $ExpectError
+}
+
+// The compiler throws an error if the function is provided a second argument which is not a number...
+{
+	ulpdiff( 5.0, true ); // $ExpectError
+	ulpdiff( 5.0, false ); // $ExpectError
+	ulpdiff( 5.0, null ); // $ExpectError
+	ulpdiff( 5.0, undefined ); // $ExpectError
+	ulpdiff( 5.0, '5' ); // $ExpectError
+	ulpdiff( 5.0, [] ); // $ExpectError
+	ulpdiff( 5.0, {} ); // $ExpectError
+	ulpdiff( 5.0, ( x: number ): number => x ); // $ExpectError
+}
+
+// The compiler throws an error if the function is provided an unsupported number of arguments...
+{
+	ulpdiff(); // $ExpectError
+	ulpdiff( 5.0 ); // $ExpectError
+	ulpdiff( 5.0, 5.0, 5.0 ); // $ExpectError
+}

lib/node_modules/@stdlib/number/float64/base/ulp-difference/examples/index.js

@@ -24,12 +24,20 @@ var ulpdiff = require( './../lib' );
 
 var d = ulpdiff( 1.0, 1.0+EPS );
 console.log( d );
+// => 1.0
 
 d = ulpdiff( 5.8364e-319, 5.8367e-319 );
 console.log( d );
+// => 6.0
 
 d = ulpdiff( 0.0, SMALLEST_SUBNORMAL );
 console.log( d );
+// => 1.0
 
 d = ulpdiff( 0.0, -0.0 );
 console.log( d );
+// => 0.0
+
+d = ulpdiff( SMALLEST_SUBNORMAL, -SMALLEST_SUBNORMAL );
+console.log( d );
+// => 2.0

lib/node_modules/@stdlib/number/float64/base/ulp-difference/lib/main.js

@@ -28,7 +28,7 @@
 
 // VARIABLES //
 
 var WX = new Uint32Array( 2 ); // WARNING: not thread safe
 var WY = new Uint32Array( 2 );
 var WZ = new Uint32Array( 2 );
 
@@ -144,6 +144,7 @@
 * ## Notes
 *
 * -   Adjacent double-precision floating-point numbers differ by 1 ulp (unit in the last place).
+* -   Signed zeros differ only in the sign bit but are considered numerically equal, and thus their ULP difference is 0.
 *
 * @param {number} x - first value
 * @param {number} y - second value
@@ -199,7 +200,7 @@
 	} else { // ord === -1
 		wz = subtract( wy, wx, WZ );
 	}
 	// Return a double as a result, which is fine for ≤2^53 ulps:
 	return ( wz[ 0 ]*TWO_32 ) + wz[ 1 ];
 }