Class SloppyMath

Math functions that trade off accuracy for speed.

Inheritance
object
SloppyMath
Inherited Members
Namespace: Lucene.Net.Util
Assembly: Lucene.Net.dll
Syntax
public static class SloppyMath

Methods

Asin(double)

Returns the arc sine of a value.

The returned angle is in the range -pi/2 through pi/2. Error is around 1E-7.

Special cases:
  • If the argument is NaN or its absolute value is greater than 1, then the result is NaN.
Declaration
public static double Asin(double a)
Parameters
Type Name Description
double a

the value whose arc sine is to be returned.
Returns
Type Description
double

arc sine of the argument
See Also

Cos(double)

Returns the trigonometric cosine of an angle.

Error is around 1E-15.

Special cases:
  • If the argument is NaN or an infinity, then the result is NaN.
Declaration
public static double Cos(double a)
Parameters
Type Name Description
double a

An angle, in radians.
Returns
Type Description
double

The cosine of the argument.
See Also

EarthDiameter(double)

Return an approximate value of the diameter of the earth at the given latitude, in kilometers.

Declaration
public static double EarthDiameter(double latitude)
Parameters
Type Name Description
double latitude
Returns
Type Description
double

Haversin(double, double, double, double)

Returns the distance in kilometers between two points specified in decimal degrees (latitude/longitude).

Declaration
public static double Haversin(double lat1, double lon1, double lat2, double lon2)
Parameters
Type Name Description
double lat1

Latitude of the first point.
double lon1

Longitude of the first point.
double lat2

Latitude of the second point.
double lon2

Longitude of the second point.
Returns
Type Description
double

distance in kilometers.