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feat: adding the value of half-ln-two for float16
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‎lib/node_modules/@stdlib/constants/float16/half-ln-two/README.md‎

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<!--
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@license Apache-2.0
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Copyright (c) 2025 The Stdlib Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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-->
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# FLOAT16_HALF_LN2
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> One half times the [natural logarithm][@stdlib/math/base/special/ln] of `2` as a half-precision floating-point number.
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<section class="usage">
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## Usage
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```javascript
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var FLOAT16_HALF_LN2 = require( '@stdlib/constants/float16/half-ln-two' );
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```
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#### FLOAT16_HALF_LN2
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One half times the [natural logarithm][@stdlib/math/base/special/ln] of `2` as a half-precision floating-point number.
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```javascript
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var bool = ( FLOAT16_HALF_LN2 === 0.3466796875 );
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// returns true
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```
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</section>
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<!-- /.usage -->
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<section class="examples">
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## Examples
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<!-- TODO: better example -->
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<!-- eslint no-undef: "error" -->
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```javascript
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var FLOAT16_HALF_LN2 = require( '@stdlib/constants/float16/half-ln-two' );
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console.log( FLOAT16_HALF_LN2 );
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// => 0.3466796875
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```
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</section>
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<!-- /.examples -->
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<!-- Section for related `stdlib` packages. Do not manually edit this section, as it is automatically populated. -->
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<section class="related">
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* * *
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## See Also
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- <span class="package-name">[`@stdlib/constants/float32/half-ln-two`][@stdlib/constants/float32/half-ln-two]</span><span class="delimiter">: </span><span class="description">one half times the natural logarithm of 2.</span>
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</section>
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<!-- /.related -->
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<!-- Section for all links. Make sure to keep an empty line after the `section` element and another before the `/section` close. -->
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<section class="links">
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[@stdlib/math/base/special/ln]: https://github.com/stdlib-js/stdlib/tree/develop/lib/node_modules/%40stdlib/math/base/special/ln
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<!-- <related-links> -->
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[@stdlib/constants/float32/half-ln-two]: https://github.com/stdlib-js/stdlib/tree/develop/lib/node_modules/%40stdlib/constants/float32/half-ln-two
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<!-- </related-links> -->
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</section>
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<!-- /.links -->

‎lib/node_modules/@stdlib/constants/float16/half-ln-two/docs/repl.txt‎

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{{alias}}
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One half times the natural logarithm of 2 as a half-precision
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floating-point number.
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Examples
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--------
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> {{alias}}
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0.3466796875
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See Also
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--------
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‎lib/node_modules/@stdlib/constants/float16/half-ln-two/docs/types/index.d.ts‎

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/*
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* @license Apache-2.0
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*
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* Copyright (c) 2025 The Stdlib Authors.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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// TypeScript Version: 4.1
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/**
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* One half times the natural logarithm of 2 as a half-precision floating-point number.
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*
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* @example
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* var val = FLOAT16_HALF_LN2;
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* // returns 0.3466796875
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*/
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declare const FLOAT16_HALF_LN2: number;
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// EXPORTS //
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export = FLOAT16_HALF_LN2;

‎lib/node_modules/@stdlib/constants/float16/half-ln-two/docs/types/test.ts‎

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/*
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* @license Apache-2.0
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*
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* Copyright (c) 2025 The Stdlib Authors.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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import FLOAT16_HALF_LN2 = require( './index' );
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// TESTS //
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// The export is a number...
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{
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// eslint-disable-next-line @typescript-eslint/no-unused-expressions
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FLOAT16_HALF_LN2; // $ExpectType number
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}

‎lib/node_modules/@stdlib/constants/float16/half-ln-two/examples/index.js‎

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/**
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* @license Apache-2.0
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*
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* Copyright (c) 2025 The Stdlib Authors.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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'use strict';
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var FLOAT16_HALF_LN2 = require( './../lib' );
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console.log( FLOAT16_HALF_LN2 );
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// => 0.3466796875

‎lib/node_modules/@stdlib/constants/float16/half-ln-two/lib/index.js‎

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/**
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* @license Apache-2.0
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*
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* Copyright (c) 2025 The Stdlib Authors.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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'use strict';
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/**
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* One half times the natural logarithm of 2 as a half-precision floating-point number.
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*
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* @module @stdlib/constants/float16/half-ln-two
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* @type {number}
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*
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* @example
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* var FLOAT16_HALF_LN2 = require( '@stdlib/constants/float16/half-ln-two' );
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* // returns 0.3466796875
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*/
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// MAIN //
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/**
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* One half times the natural logarithm of 2 as a half-precision floating-point number.
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*
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* ```tex
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* \frac{\ln 2}{2}
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* ```
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*
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* @constant
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* @type {number}
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* @default 0.3466796875
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*/
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var FLOAT16_HALF_LN2 = 0.3466796875; // 0x3EB17218
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// EXPORTS //
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module.exports = FLOAT16_HALF_LN2;

‎lib/node_modules/@stdlib/constants/float16/half-ln-two/package.json‎

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{
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"name": "@stdlib/constants/float16/half-ln-two",
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"version": "0.0.0",
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"description": "One half times the natural logarithm of 2 as a half-precision floating-point number.",
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"license": "Apache-2.0",
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"author": {
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"name": "The Stdlib Authors",
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"url": "https://github.com/stdlib-js/stdlib/graphs/contributors"
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},
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"contributors": [
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{
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"name": "The Stdlib Authors",
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"url": "https://github.com/stdlib-js/stdlib/graphs/contributors"
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}
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],
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"main": "./lib",
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"directories": {
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"doc": "./docs",
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"example": "./examples",
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"lib": "./lib",
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"test": "./test"
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},
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"types": "./docs/types",
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"scripts": {},
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"homepage": "https://github.com/stdlib-js/stdlib",
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"repository": {
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"type": "git",
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"url": "git://github.com/stdlib-js/stdlib.git"
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},
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"bugs": {
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"url": "https://github.com/stdlib-js/stdlib/issues"
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},
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"dependencies": {},
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"devDependencies": {},
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"engines": {
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"node": ">=0.10.0",
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"npm": ">2.7.0"
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},
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"os": [
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"aix",
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"darwin",
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"freebsd",
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"linux",
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"macos",
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"openbsd",
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"sunos",
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"win32",
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"windows"
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],
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"keywords": [
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"stdlib",
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"stdmath",
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"constant",
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"const",
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"mathematics",
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"math",
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"ln",
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"ln2",
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"half",
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"natural",
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"logarithm",
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"log",
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"ieee754",
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"float",
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"flt",
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"precision",
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"floating-point",
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"float16"
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]
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}

‎lib/node_modules/@stdlib/constants/float16/half-ln-two/test/test.js‎

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/**
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* @license Apache-2.0
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*
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* Copyright (c) 2025 The Stdlib Authors.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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'use strict';
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// MODULES //
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var tape = require( 'tape' );
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var lnf = require( '@stdlib/math/base/special/lnf' );
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var absf = require( '@stdlib/math/base/special/absf' );
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var EPS = require( '@stdlib/constants/float16/eps' );
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var float64ToFloat32 = require( '@stdlib/number/float64/base/to-float16' );
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var FLOAT16_HALF_LN2 = require( './../lib' );
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// TESTS //
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tape( 'main export is a number', function test( t ) {
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t.ok( true, __filename );
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t.strictEqual( typeof FLOAT16_HALF_LN2, 'number', 'main export is a number' );
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t.end();
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});
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tape( 'export is a half-precision floating-point number equal to `0.3466796875`', function test( t ) {
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t.strictEqual( FLOAT16_HALF_LN2, float64ToFloat32( 3.46573590279972654709e-01 ), 'returns expected value' );
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t.end();
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});
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tape( 'export equals `0.5*lnf(2)`', function test( t ) {
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var delta;
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var tol;
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var v;
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v = float64ToFloat32( 0.5 * lnf( 2.0 ) );
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delta = absf( float64ToFloat32( v - FLOAT16_HALF_LN2 ) );
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tol = EPS * FLOAT16_HALF_LN2;
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t.ok( delta <= tol, 'equals 0.5*lnf(2) within tolerance '+tol );
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t.end();
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});

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