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feat: add JS implementation
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‎lib/node_modules/@stdlib/math/base/special/kernel-cosf/lib/index.js‎

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@@ -19,23 +19,23 @@
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'use strict';
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/**
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* Compute the cosine of a number on `[-π/4, π/4]`.
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* Compute the cosine of a single-precision floating-point number on `[-π/4, π/4]`.
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*
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* @module @stdlib/math/base/special/kernel-cosf
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*
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* @example
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* var kernelCosf = require( '@stdlib/math/base/special/kernel-cosf' );
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*
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* var v = kernelCosf( 0.0, 0.0 );
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* var v = kernelCosf( 0.0 );
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* // returns ~1.0
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*
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* v = kernelCosf( 3.141592653589793/6.0, 0.0 );
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* v = kernelCosf( 3.141592653589793/6.0 );
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* // returns ~0.866
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*
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* v = kernelCosf( 0.785, -1.144e-17 );
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* v = kernelCosf( 0.785 );
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* // returns ~0.707
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*
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* v = kernelCosf( NaN, 0.0 );
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* v = kernelCosf( NaN );
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* // returns NaN
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*/
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‎lib/node_modules/@stdlib/math/base/special/kernel-cosf/lib/main.js‎

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'use strict';
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// MODULES //
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var float64ToFloat32 = require( '@stdlib/number/float64/base/to-float32' );
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var polyval23 = require( './polyval_c23.js' );
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// VARIABLES //
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var C0 = -0.499999997251031003120 // -0x1ffffffd0c5e81.0p-54
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var C1 = 0.0416666233237390631894 // 0x155553e1053a42.0p-57
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var C2 = -0.00138867637746099294692 // -0x16c087e80f1e27.0p-62
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var C3 = 0.0000243904487962774090654 // 0x199342e0ee5069.0p-68
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var C0 = -0.499999997251031003120; // -0x1ffffffd0c5e81.0p-54
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var C1 = 0.0416666233237390631894; // 0x155553e1053a42.0p-57
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// MAIN //
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/**
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* Computes the cosine on \\( \[-\pi/4, \pi/4] \\), where \\( \pi/4 \approx 0.785398164 \\).
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* Computes the cosine of a single-precision floating-point number on \\( \[-\pi/4, \pi/4] \\), where \\( \pi/4 \approx 0.785398164 \\).
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*
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* ## Notes
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*
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* - \\( | \cos(x) - c(x) | \\) < 2^{-34.1} \approx \\( \[ -5.37 \times 10^{-11}, 5.295 \times 10^{-11} ] \\).
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* - \\( | \cos(x) - c(x) | < 2^{-34.1} \\), where \\( 2^{-34.1} \approx \[ -5.37 \times 10^{-11}, 5.295 \times 10^{-11} ] \\).
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*
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* @param {number} x - input value (in radians, assumed to be bounded by ~pi/4 in magnitude)
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* @returns {number} cosine
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*
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* @example
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* var v = kernelCosf( 0.0, 0.0 );
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* var v = kernelCosf( 0.0 );
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* // returns ~1.0
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*
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* @example
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* var v = kernelCosf( 3.141592653589793/6.0, 0.0 );
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* var v = kernelCosf( 3.141592653589793/6.0 );
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* // returns ~0.866
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*
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* @example
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* var v = kernelCosf( 0.785, -1.144e-17 );
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* var v = kernelCosf( 0.785 );
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* // returns ~0.707
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*
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* @example
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* var v = kernelCosf( NaN, 0.0 );
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* var v = kernelCosf( NaN );
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* // returns NaN
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*/
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function kernelCosf( x, y ) {
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function kernelCosf( x ) {
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var r;
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var w;
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var z;
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z = x * x;
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w = z * z;
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r = C2 + ( z*C3 );
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return ( (( 1.0+z*C0 ) + w*C1) + (w*z)*r );
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r = polyval23( z );
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return float64ToFloat32( (( 1.0+(z*C0) ) + (w*C1)) + ((w*z)*r) );
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}
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‎lib/node_modules/@stdlib/math/base/special/kernel-cosf/lib/polyval_c23.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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/* This is a generated file. Do not edit directly. */
20+
'use strict';
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// MAIN //
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/**
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* Evaluates a polynomial.
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*
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* ## Notes
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*
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* - The implementation uses [Horner's rule][horners-method] for efficient computation.
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*
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* [horners-method]: https://en.wikipedia.org/wiki/Horner%27s_method
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*
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* @private
34+
* @param {number} x - value at which to evaluate the polynomial
35+
* @returns {number} evaluated polynomial
36+
*/
37+
function evalpoly( x ) {
38+
if ( x === 0.0 ) {
39+
return -0.001388676377460993;
40+
}
41+
return -0.001388676377460993 + (x * 0.00002439044879627741);
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}
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// EXPORTS //
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module.exports = evalpoly;

‎lib/node_modules/@stdlib/math/base/special/kernel-cosf/scripts/evalpoly.js‎

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/**
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* @license Apache-2.0
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*
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* Copyright (c) 2018 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
13+
* 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.
15+
* See the License for the specific language governing permissions and
16+
* limitations under the License.
17+
*/
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19+
/*
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* This script compiles modules for evaluating polynomial functions. If any polynomial coefficients change, this script should be rerun to update the compiled files.
21+
*/
22+
'use strict';
23+
24+
// MODULES //
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26+
var resolve = require( 'path' ).resolve;
27+
var readFileSync = require( '@stdlib/fs/read-file' ).sync;
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var writeFileSync = require( '@stdlib/fs/write-file' ).sync;
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var currentYear = require( '@stdlib/time/current-year' );
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var substringBefore = require( '@stdlib/string/substring-before' );
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var substringAfter = require( '@stdlib/string/substring-after' );
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var format = require( '@stdlib/string/format' );
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var licenseHeader = require( '@stdlib/_tools/licenses/header' );
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var compile = require( '@stdlib/math/base/tools/evalpoly-compile' );
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var compileC = require( '@stdlib/math/base/tools/evalpoly-compile-c' );
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// VARIABLES //
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// Polynomial coefficients ordered in ascending degree...
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var C23 = [
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-0.00138867637746099294692, // -0x16c087e80f1e27.0p-62
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0.0000243904487962774090654 // 0x199342e0ee5069.0p-68
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];
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// Header to add to output files:
47+
var header = licenseHeader( 'Apache-2.0', 'js', {
48+
'year': currentYear(),
49+
'copyright': 'The Stdlib Authors'
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});
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header += '\n/* This is a generated file. Do not edit directly. */\n';
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// FUNCTIONS //
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/**
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* Inserts a compiled function into file content.
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*
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* @private
60+
* @param {string} text - source content
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* @param {string} id - function identifier
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* @param {string} str - function string
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* @returns {string} updated content
64+
*/
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function insert( text, id, str ) {
66+
var before;
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var after;
68+
var begin;
69+
var end;
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71+
begin = '// BEGIN: '+id;
72+
end = '// END: '+id;
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74+
before = substringBefore( text, begin );
75+
after = substringAfter( text, end );
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77+
return format( '%s// BEGIN: %s\n\n%s\n%s%s', before, id, str, end, after );
78+
}
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80+
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// MAIN //
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83+
/**
84+
* Main execution sequence.
85+
*
86+
* @private
87+
*/
88+
function main() {
89+
var fpath;
90+
var copts;
91+
var opts;
92+
var file;
93+
var str;
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95+
opts = {
96+
'encoding': 'utf8'
97+
};
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99+
fpath = resolve( __dirname, '..', 'lib', 'polyval_c23.js' );
100+
str = header + compile( C23 );
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writeFileSync( fpath, str, opts );
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103+
copts = {
104+
'dtype': 'double',
105+
'name': ''
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};
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108+
fpath = resolve( __dirname, '..', 'src', 'main.c' );
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file = readFileSync( fpath, opts );
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copts.name = 'polyval_c23';
112+
str = compileC( C23, copts );
113+
file = insert( file, copts.name, str );
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writeFileSync( fpath, file, opts );
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}
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main();

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