diff options
Diffstat (limited to 'Emby.Server.Implementations/TextEncoding/NLangDetect/Extensions/RandomExtensions.cs')
| -rw-r--r-- | Emby.Server.Implementations/TextEncoding/NLangDetect/Extensions/RandomExtensions.cs | 76 |
1 files changed, 38 insertions, 38 deletions
diff --git a/Emby.Server.Implementations/TextEncoding/NLangDetect/Extensions/RandomExtensions.cs b/Emby.Server.Implementations/TextEncoding/NLangDetect/Extensions/RandomExtensions.cs index d55ca80df..5b2fce60b 100644 --- a/Emby.Server.Implementations/TextEncoding/NLangDetect/Extensions/RandomExtensions.cs +++ b/Emby.Server.Implementations/TextEncoding/NLangDetect/Extensions/RandomExtensions.cs @@ -1,51 +1,51 @@ -using System; +using System; namespace NLangDetect.Core.Extensions { - public static class RandomExtensions - { - private const double _Epsilon = 2.22044604925031E-15; - - private static readonly object _mutex = new object(); - - private static double _nextNextGaussian; - private static bool _hasNextNextGaussian; - - /// <summary> - /// Returns the next pseudorandom, Gaussian ("normally") distributed double value with mean 0.0 and standard deviation 1.0 from this random number generator's sequence. - /// The general contract of nextGaussian is that one double value, chosen from (approximately) the usual normal distribution with mean 0.0 and standard deviation 1.0, is pseudorandomly generated and returned. - /// </summary> - /// <remarks> - /// Taken from: http://download.oracle.com/javase/6/docs/api/java/util/Random.html (nextGaussian()) - /// </remarks> - public static double NextGaussian(this Random random) + public static class RandomExtensions { - lock (_mutex) - { - if (_hasNextNextGaussian) - { - _hasNextNextGaussian = false; + private const double _Epsilon = 2.22044604925031E-15; - return _nextNextGaussian; - } + private static readonly object _mutex = new object(); - double v1, v2, s; + private static double _nextNextGaussian; + private static bool _hasNextNextGaussian; - do + /// <summary> + /// Returns the next pseudorandom, Gaussian ("normally") distributed double value with mean 0.0 and standard deviation 1.0 from this random number generator's sequence. + /// The general contract of nextGaussian is that one double value, chosen from (approximately) the usual normal distribution with mean 0.0 and standard deviation 1.0, is pseudorandomly generated and returned. + /// </summary> + /// <remarks> + /// Taken from: http://download.oracle.com/javase/6/docs/api/java/util/Random.html (nextGaussian()) + /// </remarks> + public static double NextGaussian(this Random random) { - v1 = 2.0 * random.NextDouble() - 1.0; // between -1.0 and 1.0 - v2 = 2.0 * random.NextDouble() - 1.0; // between -1.0 and 1.0 - s = v1 * v1 + v2 * v2; - } - while (s >= 1.0 || Math.Abs(s - 0.0) < _Epsilon); + lock (_mutex) + { + if (_hasNextNextGaussian) + { + _hasNextNextGaussian = false; + + return _nextNextGaussian; + } - double multiplier = Math.Sqrt(-2.0 * Math.Log(s) / s); + double v1, v2, s; - _nextNextGaussian = v2 * multiplier; - _hasNextNextGaussian = true; + do + { + v1 = 2.0 * random.NextDouble() - 1.0; // between -1.0 and 1.0 + v2 = 2.0 * random.NextDouble() - 1.0; // between -1.0 and 1.0 + s = v1 * v1 + v2 * v2; + } + while (s >= 1.0 || Math.Abs(s - 0.0) < _Epsilon); - return v1 * multiplier; - } + double multiplier = Math.Sqrt(-2.0 * Math.Log(s) / s); + + _nextNextGaussian = v2 * multiplier; + _hasNextNextGaussian = true; + + return v1 * multiplier; + } + } } - } } |
