diff options
Diffstat (limited to 'node_modules/locutus/c/math/frexp.js')
| -rw-r--r-- | node_modules/locutus/c/math/frexp.js | 75 |
1 files changed, 0 insertions, 75 deletions
diff --git a/node_modules/locutus/c/math/frexp.js b/node_modules/locutus/c/math/frexp.js deleted file mode 100644 index 876e2f5..0000000 --- a/node_modules/locutus/c/math/frexp.js +++ /dev/null @@ -1,75 +0,0 @@ -"use strict"; - -module.exports = function frexp(arg) { - // discuss at: http://locutus.io/c/frexp/ - // original by: Oskar Larsson Högfeldt (http://oskar-lh.name/) - // note 1: Instead of - // note 1: double frexp( double arg, int* exp ); - // note 1: this is built as - // note 1: [double, int] frexp( double arg ); - // note 1: due to the lack of pointers in JavaScript. - // note 1: See code comments for further information. - // example 1: frexp(1) - // returns 1: [0.5, 1] - // example 2: frexp(1.5) - // returns 2: [0.75, 1] - // example 3: frexp(3 * Math.pow(2, 500)) - // returns 3: [0.75, 502] - // example 4: frexp(-4) - // returns 4: [-0.5, 3] - // example 5: frexp(Number.MAX_VALUE) - // returns 5: [0.9999999999999999, 1024] - // example 6: frexp(Number.MIN_VALUE) - // returns 6: [0.5, -1073] - // example 7: frexp(-Infinity) - // returns 7: [-Infinity, 0] - // example 8: frexp(-0) - // returns 8: [-0, 0] - // example 9: frexp(NaN) - // returns 9: [NaN, 0] - - // Potential issue with this implementation: - // the precisions of Math.pow and the ** operator are undefined in the ECMAScript standard, - // however, sane implementations should give the same results for Math.pow(2, <integer>) operations - - // Like frexp of C and std::frexp of C++, - // but returns an array instead of using a pointer argument for passing the exponent result. - // Object.is(n, frexp(n)[0] * 2 ** frexp(n)[1]) for all number values of n except when Math.isFinite(n) && Math.abs(n) > 2**1023 - // Object.is(n, (2 * frexp(n)[0]) * 2 ** (frexp(n)[1] - 1)) for all number values of n - // Object.is(n, frexp(n)[0]) for these values of n: 0, -0, NaN, Infinity, -Infinity - // Math.abs(frexp(n)[0]) is >= 0.5 and < 1.0 for any other number-type value of n - // See http://en.cppreference.com/w/c/numeric/math/frexp for a more detailed description - - arg = Number(arg); - - var result = [arg, 0]; - - if (arg !== 0 && Number.isFinite(arg)) { - var absArg = Math.abs(arg); - // Math.log2 was introduced in ES2015, use it when available - var log2 = Math.log2 || function log2(n) { - return Math.log(n) * Math.LOG2E; - }; - var exp = Math.max(-1023, Math.floor(log2(absArg)) + 1); - var x = absArg * Math.pow(2, -exp); - - // These while loops compensate for rounding errors that sometimes occur because of ECMAScript's Math.log2's undefined precision - // and also works around the issue of Math.pow(2, -exp) === Infinity when exp <= -1024 - while (x < 0.5) { - x *= 2; - exp--; - } - while (x >= 1) { - x *= 0.5; - exp++; - } - - if (arg < 0) { - x = -x; - } - result[0] = x; - result[1] = exp; - } - return result; -}; -//# sourceMappingURL=frexp.js.map
\ No newline at end of file |