JGEOMETRY3D::JEigenValues3D Class Reference

Eigen values in 3D. More...

#include <JEigenValues3D.hh>

Inheritance diagram for JGEOMETRY3D::JEigenValues3D:

Public Member Functions
template<class T >
	JEigenValues3D (T __begin, T __end)
	Constructor. More...
int	getN () const
	Get number of eigen values. More...
int	getN (double precision) const
	Get number of eigen values with minimal value. More...
	operator JVector2D () const
	Type conversion operator. More...
double	getX () const
	Get x position. More...
double	getY () const
	Get y position. More...
double	getZ () const
	Get z position. More...
JVector3D &	negate ()
	Negate vector. More...
JVector3D &	add (const JVector3D &vector)
	Add vector. More...
JVector3D &	sub (const JVector3D &vector)
	Subtract vector. More...
JVector3D &	mul (const double factor)
	Scale vector. More...
JVector3D &	mul (const JNullType &object)
	Multiply with object. More...
JVector3D &	div (const double factor)
	Scale vector. More...
JVector3D &	transform (const JMatrix3D &T)
	Transform. More...
bool	equals (const JVector3D &vector) const
	Check equality. More...
double	getLengthSquared () const
	Get length squared. More...
double	getLength () const
	Get length. More...
double	getDistanceSquared (const JVector3D &pos) const
	Get squared of distance to point. More...
double	getDistance (const JVector3D &pos) const
	Get distance to point. More...
double	getDot (const JVector3D &vector) const
	Get dot product. More...
JVector3D &	cross (const JVector3D &first, const JVector3D &second)
	Get cross product. More...

Protected Attributes
int	N
double	__x
double	__y
double	__z

Detailed Description

Eigen values in 3D.

Definition at line 24 of file JEigenValues3D.hh.

Constructor & Destructor Documentation

template<class T >

JGEOMETRY3D::JEigenValues3D::JEigenValues3D ( T  __begin, T  __end  )

inline

Constructor.

Parameters

__begin	begin of data
__end	end of data

Definition at line 35 of file JEigenValues3D.hh.

                            :
      JVector3D(),
      N(0)
    {
      const JCenter3D center(__begin, __end);
        
      // RMS matrix
        
      TMatrixDSym A(3);
        
      for (int i = 0; i != 3; ++i) {
        for (int j = 0; j != 3; ++j) {
          A(i,j) = 0.0;
        }
      }
        
      for (T i = __begin; i != __end; ++i) {
        
        const double dx = center.getX() - i->getX();
        const double dy = center.getY() - i->getY();
        const double dz = center.getZ() - i->getZ();
          
        A(0,0) += (dx * dx);
        A(0,1) += (dx * dy);
        A(0,2) += (dx * dz);
        
        A(1,1) += (dy * dy);
        A(1,2) += (dy * dz);
        
        A(2,2) += (dz * dz);
      }
      
      A(1,0) = A(0,1);
      A(2,0) = A(0,2);
      A(2,1) = A(1,2);

      const TVectorD V = TMatrixDSymEigen(A).GetEigenValues();   // copy!

      N = V.GetNoElements();

      switch (N) {

      case 3:
        __z = V[2];

      case 2:
        __y = V[1];

      case 1:
        __x = V[0];
        break;

      default:
        break;
      }
    }

Member Function Documentation

int JGEOMETRY3D::JEigenValues3D::getN ( ) const

inline

Get number of eigen values.

Returns

number of eigen values

Definition at line 99 of file JEigenValues3D.hh.

    {
      return N;
    }

int JGEOMETRY3D::JEigenValues3D::getN ( double  precision ) const

inline

Get number of eigen values with minimal value.

Parameters

precision

minimal value

Returns

number of eigen values

Definition at line 111 of file JEigenValues3D.hh.

    {
      int n = 0;

      if (fabs(getX()) >= precision) ++n;
      if (fabs(getY()) >= precision) ++n;
      if (fabs(getZ()) >= precision) ++n;

      if (n > N)
        return N;
      else
        return n;
    }

JGEOMETRY3D::JVector3D::operator JVector2D ( ) const

inlineinherited

Type conversion operator.

Returns

JVector2D

Definition at line 81 of file JVector3D.hh.

    {
      return JVector2D(this->getX(), this->getY());
    }

double JGEOMETRY3D::JVector3D::getX ( ) const

inlineinherited

Get x position.

Returns

x position

Definition at line 92 of file JVector3D.hh.

    { 
      return __x;
    }

double JGEOMETRY3D::JVector3D::getY ( ) const

inlineinherited

Get y position.

Returns

y position

Definition at line 102 of file JVector3D.hh.

    { 
      return __y;
    }

double JGEOMETRY3D::JVector3D::getZ ( ) const

inlineinherited

Get z position.

Returns

z position

Definition at line 113 of file JVector3D.hh.

    { 
      return __z;
    }

JVector3D& JGEOMETRY3D::JVector3D::negate ( )

inlineinherited

Negate vector.

Returns

this vector

Definition at line 124 of file JVector3D.hh.

    {
      __x = -__x;
      __y = -__y;
      __z = -__z;

      return *this;
    }

JVector3D& JGEOMETRY3D::JVector3D::add ( const JVector3D &  vector )

inlineinherited

Add vector.

Parameters

vector

vector

Returns

this vector

Definition at line 140 of file JVector3D.hh.

    {
      __x += vector.getX();
      __y += vector.getY();
      __z += vector.getZ();

      return *this;
    }

JVector3D& JGEOMETRY3D::JVector3D::sub ( const JVector3D &  vector )

inlineinherited

Subtract vector.

Parameters

vector

vector

Returns

this vector

Definition at line 156 of file JVector3D.hh.

    {
      __x -= vector.getX();
      __y -= vector.getY();
      __z -= vector.getZ();

      return *this;
    }

JVector3D& JGEOMETRY3D::JVector3D::mul ( const double  factor )

inlineinherited

Scale vector.

Parameters

factor

multiplication factor

Returns

this vector

Definition at line 172 of file JVector3D.hh.

    {
      __x *= factor;
      __y *= factor;
      __z *= factor;

      return *this;
    }

JVector3D & JMATH::JMath< JVector3D , JNullType >::mul ( const JNullType &  object )

inlineinherited

Multiply with object.

Parameters

object

object

Returns

result object

Definition at line 273 of file JMath.hh.

    {
      return static_cast<JFirst_t&>(*this) = JCalculator<JFirst_t>::calculator.mul(static_cast<const JFirst_t&>(*this), object);
    }

JVector3D& JGEOMETRY3D::JVector3D::div ( const double  factor )

inlineinherited

Scale vector.

Parameters

factor

division factor

Returns

this vector

Definition at line 188 of file JVector3D.hh.

    {
      __x /= factor;
      __y /= factor;
      __z /= factor;

      return *this;
    }

JVector3D& JGEOMETRY3D::JVector3D::transform ( const JMatrix3D &  T )

inlineinherited

Transform.

Parameters

T

matrix

Returns

this vector

Definition at line 204 of file JVector3D.hh.

    {
      T.transform(__x, __y, __z);

      return *this;
    }

bool JGEOMETRY3D::JVector3D::equals ( const JVector3D &  vector ) const

inlineinherited

Check equality.

Parameters

vector

vector

Returns

true if vectors are equal; else false

Definition at line 218 of file JVector3D.hh.

    {
      return (getX() == vector.getX() && 
              getY() == vector.getY() &&
              getZ() == vector.getZ());
    }

double JGEOMETRY3D::JVector3D::getLengthSquared ( ) const

inlineinherited

Get length squared.

Returns

square of length

Definition at line 231 of file JVector3D.hh.

    { 
      return getX()*getX() + getY()*getY() + getZ()*getZ();
    }

double JGEOMETRY3D::JVector3D::getLength ( ) const

inlineinherited

Get length.

Returns

length

Definition at line 242 of file JVector3D.hh.

    { 
      return sqrt(getLengthSquared());
    }

double JGEOMETRY3D::JVector3D::getDistanceSquared ( const JVector3D &  pos ) const

inlineinherited

Get squared of distance to point.

Parameters

pos

position

Returns

square of distance

Definition at line 254 of file JVector3D.hh.

    {
      return JVector3D(pos).sub(*this).getLengthSquared();
    }

double JGEOMETRY3D::JVector3D::getDistance ( const JVector3D &  pos ) const

inlineinherited

Get distance to point.

Parameters

pos

position

Returns

distance

Definition at line 266 of file JVector3D.hh.

    {
      return sqrt(getDistanceSquared(pos));
    }

double JGEOMETRY3D::JVector3D::getDot ( const JVector3D &  vector ) const

inlineinherited

Get dot product.

Parameters

vector

vector

Returns

dot product

Definition at line 278 of file JVector3D.hh.

    {
      return
        getX() * vector.getX() +
        getY() * vector.getY() +
        getZ() * vector.getZ();
    }

JVector3D& JGEOMETRY3D::JVector3D::cross ( const JVector3D &  first, const JVector3D &  second  )

inlineinherited

Get cross product.

Note that this vector should not overlap with the first or second vector,

Parameters

first	first vector
second	second vector

Returns

this vector

Definition at line 295 of file JVector3D.hh.

    {
      __x = first .getY() * second.getZ()  -  second.getY() * first .getZ();
      __y = second.getX() * first .getZ()  -  first .getX() * second.getZ();
      __z = first .getX() * second.getY()  -  second.getX() * first .getY();

      return *this;
    }

Member Data Documentation

int JGEOMETRY3D::JEigenValues3D::N

protected

Definition at line 126 of file JEigenValues3D.hh.

double JGEOMETRY3D::JVector3D::__x

protectedinherited

Definition at line 306 of file JVector3D.hh.

double JGEOMETRY3D::JVector3D::__y

protectedinherited

Definition at line 307 of file JVector3D.hh.

double JGEOMETRY3D::JVector3D::__z

protectedinherited

Definition at line 308 of file JVector3D.hh.

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The documentation for this class was generated from the following file:

• JEigenValues3D.hh