Class SloppyMath

Math functions that trade off accuracy for speed.

Inheritance
System.Object
SloppyMath
Namespace: Lucene.Net.Util
Assembly: Lucene.Net.dll
Syntax
public class SloppyMath : object

Methods

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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 or its absolute value is greater than 1, then the result is .

Declaration
public static double Asin(double a)
Parameters
Type Name Description
System.Double a

the value whose arc sine is to be returned.

Returns
Type Description
System.Double

arc sine of the argument

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Cos(Double)

Returns the trigonometric cosine of an angle.

Error is around 1E-15.

Special cases:

  • If the argument is or an infinity, then the result is .

Declaration
public static double Cos(double a)
Parameters
Type Name Description
System.Double a

An angle, in radians.

Returns
Type Description
System.Double

The cosine of the argument.

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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
System.Double latitude
Returns
Type Description
System.Double
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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
System.Double lat1

Latitude of the first point.

System.Double lon1

Longitude of the first point.

System.Double lat2

Latitude of the second point.

System.Double lon2

Longitude of the second point.

Returns
Type Description
System.Double

distance in kilometers.