Class MathUtil

Math static utility methods.

Inheritance
System.Object
MathUtil
Inherited Members
System.Object.Equals(System.Object)
System.Object.Equals(System.Object, System.Object)
System.Object.GetHashCode()
System.Object.GetType()
System.Object.MemberwiseClone()
System.Object.ReferenceEquals(System.Object, System.Object)
System.Object.ToString()
Namespace: Lucene.Net.Util
Assembly: Lucene.Net.dll
Syntax
public sealed class MathUtil

Methods

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Acosh(Double)

Calculates inverse hyperbolic cosine of a System.Double value.

Special cases:

  • If the argument is NaN, then the result is NaN.
  • If the argument is +1, then the result is a zero.
  • If the argument is positive infinity, then the result is positive infinity.
  • If the argument is less than 1, then the result is NaN.

Declaration
public static double Acosh(double a)
Parameters
Type Name Description
System.Double a
Returns
Type Description
System.Double
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Asinh(Double)

Calculates inverse hyperbolic sine of a System.Double value.

Special cases:

  • If the argument is NaN, then the result is NaN.
  • If the argument is zero, then the result is a zero with the same sign as the argument.
  • If the argument is infinite, then the result is infinity with the same sign as the argument.

Declaration
public static double Asinh(double a)
Parameters
Type Name Description
System.Double a
Returns
Type Description
System.Double
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Atanh(Double)

Calculates inverse hyperbolic tangent of a System.Double value.

Special cases:

  • If the argument is NaN, then the result is NaN.
  • If the argument is zero, then the result is a zero with the same sign as the argument.
  • If the argument is +1, then the result is positive infinity.
  • If the argument is -1, then the result is negative infinity.
  • If the argument's absolute value is greater than 1, then the result is NaN.

Declaration
public static double Atanh(double a)
Parameters
Type Name Description
System.Double a
Returns
Type Description
System.Double
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Gcd(Int64, Int64)

Return the greatest common divisor of a and b, consistently with System.Numerics.BigInteger.GreatestCommonDivisor(System.Numerics.BigInteger, System.Numerics.BigInteger).

NOTE: A greatest common divisor must be positive, but 2^64 cannot be expressed as a System.Int64 although it is the GCD of System.Int64.MinValue and 0 and the GCD of System.Int64.MinValue and System.Int64.MinValue. So in these 2 cases, and only them, this method will return System.Int64.MinValue.

Declaration
public static long Gcd(long a, long b)
Parameters
Type Name Description
System.Int64 a
System.Int64 b
Returns
Type Description
System.Int64
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Log(Double, Double)

Calculates logarithm in a given base with doubles.

Declaration
public static double Log(double base, double x)
Parameters
Type Name Description
System.Double base
System.Double x
Returns
Type Description
System.Double
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Log(Int64, Int32)

Returns x <= 0 ? 0 : Math.Floor(Math.Log(x) / Math.Log(base)).

Declaration
public static int Log(long x, int base)
Parameters
Type Name Description
System.Int64 x
System.Int32 base

Must be > 1.
Returns
Type Description
System.Int32