org.ode4j.math
Class DVector4

java.lang.Object
  org.ode4j.math.DVector4

All Implemented Interfaces:

DVector4C

public class DVector4
extends java.lang.Object
implements DVector4C

Constructor Summary

DVector4()

DVector4(DVector4 v4)

Method Summary

int	dim()
double	dot(DVector4C b) Return the 'dot' product of two vectors.
double	get(int i)
double	get0()
double	get1()
double	get2()
double	get3()
double	length()
double	lengthSquared()
void	normalize() this may be called for vectors `a' with extremely small magnitude, for example the result of a cross product on two nearly perpendicular vectors.
boolean	safeNormalize4() this may be called for vectors `a' with extremely small magnitude, for example the result of a cross product on two nearly perpendicular vectors.
DVector4	scale(double d)
void	set(double[] a)
void	set(double a, double b, double c, double d)
void	set0(double d)
void	set1(double d)
void	set2(double d)
void	set3(double d)
java.lang.String	toString()

Methods inherited from class java.lang.Object

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

Constructor Detail

DVector4

public DVector4(DVector4 v4)

DVector4

public DVector4()

Method Detail

set

public void set(double a,
                double b,
                double c,
                double d)

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object

get0

public double get0()

Specified by:

get0 in interface DVector4C

get1

public double get1()

Specified by:

get1 in interface DVector4C

get2

public double get2()

Specified by:

get2 in interface DVector4C

get3

public double get3()

Specified by:

get3 in interface DVector4C

dim

public int dim()

scale

public DVector4 scale(double d)

lengthSquared

public double lengthSquared()

Specified by:

lengthSquared in interface DVector4C

length

public double length()

Specified by:

length in interface DVector4C

get

public double get(int i)

Specified by:

get in interface DVector4C

Parameters:

i - The row to return [0, 1, 2].

safeNormalize4

public final boolean safeNormalize4()

this may be called for vectors `a' with extremely small magnitude, for example the result of a cross product on two nearly perpendicular vectors. we must be robust to these small vectors. to prevent numerical error, first find the component a[i] with the largest magnitude and then scale all the components by 1/a[i]. then we can compute the length of `a' and scale the components by 1/l. this has been verified to work with vectors containing the smallest representable numbers.

normalize

public void normalize()

this may be called for vectors `a' with extremely small magnitude, for example the result of a cross product on two nearly perpendicular vectors. we must be robust to these small vectors. to prevent numerical error, first find the component a[i] with the largest magnitude and then scale all the components by 1/a[i]. then we can compute the length of `a' and scale the components by 1/l. this has been verified to work with vectors containing the smallest representable numbers.

set

public void set(double[] a)

dot

public final double dot(DVector4C b)

Return the 'dot' product of two vectors. r = a0*b0 + a1*b1 + a2*b2 + a3*b3;

Specified by:

dot in interface DVector4C

Parameters:

b -

Returns:

(this) * b

See Also:

dot(DVector4C)

set0

public void set0(double d)

set1

public void set1(double d)

set2

public void set2(double d)

set3

public void set3(double d)