com.mhuss.AstroLib

Class MathOps

java.lang.Object

com.mhuss.AstroLib.MathOps

public class MathOps
extends java.lang.Object

MathOps contains some useful trig, vector and matrix operations.

Based on C code by Bill Gray (www.projectpluto.com)

Field Summary

Fields

Modifier and Type	Field and Description
static int	VECTOR_SIZE

Constructor Summary

Constructors

Constructor and Description
MathOps()

Method Summary

Modifier and Type	Method and Description
static double	acose(double arg) Calculates the arc cosine, but limits the input to the range ( -1.0 < rad < +1.0 ).
static double	asine(double arg) Calculates the arc sine, but limits the input to the range ( -1.0 < rad < +1.0 ).
static void	cartesianToPolar(double[] cartVect, double[] polarCoord)
static void	polarToCartesian(double[] vectC, double[] vectP) Convert polar coordinates with radius to Cartesian coordinates added by w.
static void	polarToCartesian(double[] vect, double lon, double lat, double radius) Convert polar coordinates with radius to Cartesian coordinates added by w.
static void	rotateVector(double[] v, double angle, int axis) Rotate a vector along the specified axis.
static void	setIdentityMatrix(double[] matrix) Initializes a matrix to base (identity) values.

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

VECTOR_SIZE

public static final int VECTOR_SIZE

See Also:

Constant Field Values

Constructor Detail

MathOps

public MathOps()

Method Detail

acose

public static double acose(double arg)

Calculates the arc cosine, but limits the input to the range ( -1.0 < rad < +1.0 ).
This avoids overflow errors. If the input is <= -1.0 radians, Math.PI is returned. If the input is >= 1.0 radians, 0 is returned.

Parameters:

arg - The angle in radians

Returns:

The arc cosine, limited to the range 0 to Pi.

asine

public static double asine(double arg)

Calculates the arc sine, but limits the input to the range ( -1.0 < rad < +1.0 ).
This avoids overflow errors. If the input is less than -1 (radian), -PI/2 is returned. If the input is greater than 1 (radian), +PI/2 is returned.

Parameters:

arg - The angle in radians

Returns:

The arc sine, limited to the range -Pi/2 0 to Pi/2.

setIdentityMatrix

public static void setIdentityMatrix(double[] matrix)

Initializes a matrix to base (identity) values. The matrix is set as follows: [1][0][0] [0][1][0] [0][0][1]

Parameters:

matrix - The matrix to initialize

rotateVector

public static void rotateVector(double[] v,
                                double angle,
                                int axis)

Rotate a vector along the specified axis.

Parameters:

v - The vector to rotate

angle - The angle to use

axis - The axis along which to rotate

polarToCartesian

public static void polarToCartesian(double[] vect,
                                    double lon,
                                    double lat,
                                    double radius)

Convert polar coordinates with radius to Cartesian coordinates added by w. Strickling

Parameters:

vect - Vector to hold the Cartesian coordinates

lon - Polar longitude

lat - Polar latitude

polarToCartesian

public static void polarToCartesian(double[] vectC,
                                    double[] vectP)

Convert polar coordinates with radius to Cartesian coordinates added by w. Strickling

Parameters:

vectC - Vector to hold the Cartesian coordinates

vectP - Vector to hold the Polar coordinates

cartesianToPolar

public static void cartesianToPolar(double[] cartVect,
                                    double[] polarCoord)