Class MathUtil

Math static utility methods.

Inheritance

object

MathUtil

Inherited Members

object.Equals(object)

object.Equals(object, object)

object.GetHashCode()

object.GetType()

object.MemberwiseClone()

object.ReferenceEquals(object, object)

object.ToString()

Namespace: Lucene.Net.Util

Assembly: Lucene.Net.dll

Syntax

public static class MathUtil

Methods

Acosh(double)

Calculates inverse hyperbolic cosine of a 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
double	a

Returns

Type	Description
double

Asinh(double)

Calculates inverse hyperbolic sine of a 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
double	a

Returns

Type	Description
double

Atanh(double)

Calculates inverse hyperbolic tangent of a 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
double	a

Returns

Type	Description
double

Gcd(long, long)

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 long although it is the GCD of MinValue and 0 and the GCD of MinValue and MinValue. So in these 2 cases, and only them, this method will return MinValue.

Declaration

public static long Gcd(long a, long b)

Parameters

Type	Name	Description
long	a
long	b

Returns

Type	Description
long

Log(double, double)

Calculates logarithm in a given base with doubles.

Declaration

public static double Log(double @base, double x)

Parameters

Type	Name	Description
double	base
double	x

Returns

Type	Description
double

Log(long, int)

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
long	x
int	base	Must be > 1.

Returns

Type	Description
int