healpix.essentials
Class FastMath

java.lang.Object
  extended by healpix.essentials.FastMath

public final class FastMath
extends Object

FastMath class is a Java implementation of the SLEEF library. Some of the methods can be used as substitutions of the corresponding methods in Math class. They have slightly less accuracy, and some methods are faster compared to those methods in Math class. Please note that the methods in the standard Math class are JNI methods, and the SLEEF library is specialized for SIMD operations.


Constructor Summary
FastMath()
           
 
Method Summary
static double acos(double d)
          This method calculates the arc cosine of x in radians.
static double asin(double d)
          This method calculates the arc sine of x in radians.
static double atan(double s)
          Returns the arc tangent of an angle.
static double atan2(double y, double x)
          This method calculates the arc tangent of y/x in radians, using the signs of the two arguments to determine the quadrant of the result.
static double cos(double d)
          Returns the trigonometric cosine of an angle.
static double sin(double d)
          Returns the trigonometric sine of an angle.
 
Methods inherited from class java.lang.Object
equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Constructor Detail

FastMath

public FastMath()
Method Detail

atan2

public static final double atan2(double y,
                                 double x)
This method calculates the arc tangent of y/x in radians, using the signs of the two arguments to determine the quadrant of the result. The results may have maximum error of 2 ulps.


asin

public static double asin(double d)
This method calculates the arc sine of x in radians. The return value is in the range [-pi/2, pi/2]. The results may have maximum error of 3 ulps.


acos

public static double acos(double d)
This method calculates the arc cosine of x in radians. The return value is in the range [0, pi]. The results may have maximum error of 3 ulps.


atan

public static final double atan(double s)
Returns the arc tangent of an angle. The results may have maximum error of 2 ulps.


sin

public static final double sin(double d)
Returns the trigonometric sine of an angle. The results may have maximum error of 2 ulps.


cos

public static final double cos(double d)
Returns the trigonometric cosine of an angle. The results may have maximum error of 2 ulps.


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