AmgMatrixBasePlugin.h File Reference

#include <cmath>

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Functions
const PlainObject	unit () const
	This is a plugin that makes Eigen look like CLHEP & defines some convenience methods.
Scalar	mag () const
	mag method
Scalar	mag2 () const
	mag2 method - forward to squaredNorm()
Scalar	perp2 () const
	perp2 method - perpendicular length squared
Scalar	perp () const
	perp method - perpendicular length
Scalar	perp2 (const MatrixBase< Derived > &vecvec)
	perp2 method wrt another vector
Scalar	perp (const MatrixBase< Derived > &vecvec)
	perp2 method wrt another vector
Scalar	phi () const
	phi method
Scalar	theta () const
	theta method
Scalar	eta () const
	pseudorapidity method
Scalar	deltaR (const MatrixBase< Derived > &vecvec) const
Scalar	deltaPhi (const MatrixBase< Derived > &vecvec) const
void	fillSymmetric (size_t i, size_t j, Scalar value)
	method to fill elements for a symmetric matrix
template<typename OtherDerived>
Matrix< Scalar, OtherDerived::RowsAtCompileTime, OtherDerived::RowsAtCompileTime >	similarity (const MatrixBase< OtherDerived > &m) const
	similarity method : yields ms = m*s*m^T
template<typename OtherDerived>
Matrix< Scalar, OtherDerived::RowsAtCompileTime, OtherDerived::RowsAtCompileTime >	similarityT (const MatrixBase< OtherDerived > &m) const
	similarityT method : yields ms = m^T*s*m

Function Documentation

deltaPhi()

Scalar deltaPhi ( const MatrixBase< Derived > & vec ) const

inline

Definition at line 112 of file AmgMatrixBasePlugin.h.

                                                             {
  //we assert in eta/phi methods
  double dphi = vec.phi() - this->phi();
  if (dphi > M_PI) {
    dphi -= M_PI * 2;
  } else if (dphi <= -M_PI) {
    dphi += M_PI * 2;
  }
  return dphi;
}

deltaR()

Scalar deltaR ( const MatrixBase< Derived > & vec ) const

inline

Definition at line 105 of file AmgMatrixBasePlugin.h.

                                                           {
  //we assert in eta/phi methods
  double a = this->eta() - vec.eta();
  double b = this->deltaPhi(vec);
  return std::sqrt(a * a + b * b);
}

eta()

Scalar eta ( ) const

inline

pseudorapidity method

Definition at line 83 of file AmgMatrixBasePlugin.h.

                          {
  constexpr int size = Eigen::MatrixBase<Derived>::SizeAtCompileTime;
  constexpr int isVector = Eigen::MatrixBase<Derived>::IsVectorAtCompileTime;
  static_assert(isVector && size>=3, "Method applicable for vectors of size >=3");
  const Scalar rho2 = (*this).x() * (*this).x() + (*this).y() * (*this).y();
  const Scalar z = (*this).z();
  const Scalar z2 = z * z;
  constexpr Scalar epsilon = 2. * std::numeric_limits<Scalar>::epsilon();
  // avoid magnitude being parallel to z
  if (rho2 >  z2 * epsilon) {
    const double m = std::sqrt(rho2 + z2);
    return 0.5 * std::log((m + z) / (m - z));
  }
  if (z == 0) {
    return 0.0;
  }
  // Following math/genvector/inc/Math/GenVector/etaMax.h in ROOT 6.26
  constexpr Scalar s_etaMax = static_cast<Scalar>(22756.0);
  // Following math/genvector/inc/Math/GenVector/eta.h in ROOT 6.26
  return (z > 0) ? z + s_etaMax : z - s_etaMax;
}

fillSymmetric()

void fillSymmetric ( size_t i, size_t j, Scalar value )

inline

method to fill elements for a symmetric matrix

Definition at line 124 of file AmgMatrixBasePlugin.h.

                                                            {
  (*this)(i, j) = value;
  (*this)(j, i) = value;
}

mag()

Scalar mag ( ) const

inline

mag method

Definition at line 26 of file AmgMatrixBasePlugin.h.

                          {
  return (*this).norm();
}

mag2()

Scalar mag2 ( ) const

inline

mag2 method - forward to squaredNorm()

Definition at line 31 of file AmgMatrixBasePlugin.h.

                           {
  return (*this).squaredNorm();
}

perp() [1/2]

Scalar perp ( ) const

inline

perp method - perpendicular length

Definition at line 44 of file AmgMatrixBasePlugin.h.

                           {
  constexpr int size = Eigen::MatrixBase<Derived>::SizeAtCompileTime;
  constexpr int isVector = Eigen::MatrixBase<Derived>::IsVectorAtCompileTime;
  static_assert(isVector && size>=2, "Method applicable for vectors of size >=2");
  return std::sqrt(this->perp2());
}

perp() [2/2]

Scalar perp ( const MatrixBase< Derived > & vec )

inline

perp2 method wrt another vector

Definition at line 62 of file AmgMatrixBasePlugin.h.

                                                   {
  return std::sqrt(this->perp2(vec));
}

perp2() [1/2]

Scalar perp2 ( ) const

inline

perp2 method - perpendicular length squared

Definition at line 36 of file AmgMatrixBasePlugin.h.

                            {
  constexpr int size = Eigen::MatrixBase<Derived>::SizeAtCompileTime;
  constexpr int isVector = Eigen::MatrixBase<Derived>::IsVectorAtCompileTime;
  static_assert(isVector && size>=2, "Method applicable for vectors of size >=2");
  return ((*this)[0] * (*this)[0] + (*this)[1] * (*this)[1]);
}

perp2() [2/2]

Scalar perp2 ( const MatrixBase< Derived > & vec )

inline

perp2 method wrt another vector

Definition at line 52 of file AmgMatrixBasePlugin.h.

                                                    {
  Scalar tot = vec.mag2();
  if (tot > 0) {
    Scalar s = this->dot(vec);
    return this->mag2() - s * s / tot;
  }
  return this->mag2();
}

phi()

Scalar phi ( ) const

inline

phi method

Definition at line 67 of file AmgMatrixBasePlugin.h.

                          {
  constexpr int size = Eigen::MatrixBase<Derived>::SizeAtCompileTime;
  constexpr int isVector = Eigen::MatrixBase<Derived>::IsVectorAtCompileTime;
  static_assert(isVector && size>=2, "Method applicable for vectors of size >=2");
  return std::atan2((*this)[1], (*this)[0]);
}

similarity()

template<typename OtherDerived>

Matrix< Scalar, OtherDerived::RowsAtCompileTime, OtherDerived::RowsAtCompileTime > similarity ( const MatrixBase< OtherDerived > & m ) const

inline

similarity method : yields ms = m*s*m^T

Definition at line 133 of file AmgMatrixBasePlugin.h.

                                                    {
  return m * (this->derived() * m.transpose());
}

similarityT()

template<typename OtherDerived>

Matrix< Scalar, OtherDerived::RowsAtCompileTime, OtherDerived::RowsAtCompileTime > similarityT ( const MatrixBase< OtherDerived > & m ) const

inline

similarityT method : yields ms = m^T*s*m

Definition at line 141 of file AmgMatrixBasePlugin.h.

                                                     {
  return m.transpose() * (this->derived() * m);
}

theta()

Scalar theta ( ) const

inline

theta method

Definition at line 75 of file AmgMatrixBasePlugin.h.

                            {
  constexpr int size = Eigen::MatrixBase<Derived>::SizeAtCompileTime;
  constexpr int isVector = Eigen::MatrixBase<Derived>::IsVectorAtCompileTime;
  static_assert(isVector && size>=3, "Method applicable for vectors of size >=3");
  return std::atan2(this->perp(), (*this)[2]);
}

unit()

const PlainObject unit ( ) const

inline

This is a plugin that makes Eigen look like CLHEP & defines some convenience methods.

unit method - forward normalized()

Definition at line 21 of file AmgMatrixBasePlugin.h.

                                      {
  return (*this).normalized();
}