Common Math Functions

The most commonly used mathematical functions are provided under the package:

All the functions below are defined in the namespace reco.

Below is a list of the supported functions:

ΔR

Header file: #include "DataFormats/Math/interface/deltaR.h"

  • ΔR of two vectors:
      template<typename T1, typename T2>
      double deltaR(const T1 & t1, const T2 & t2);

  • ΔR-squared of two vectors:
      template<typename T1, typename T2>
      double deltaR2(const T1 & t1, const T2 & t2) ;

  • ΔR-squared of two vectors, passing eta and φ:
      double deltaR2(double eta1, double phi1, double eta2, double phi2);

  • ΔR of two vectors, passing eta and φ:
      double deltaR(double eta1, double phi1, double eta2, double phi2);

3D angle

Header file: #include "DataFormats/Math/interface/angle.h"

  • 3D angle between two vectors:
      template<typename T1, typename T2>
      double angle(const T1 & t1, const T2 & t2); 

  • 3D angle between two vectors, passing cartesian coordinates of the two vectors:
      template <class T>
      T angle (T x1, T y1, T z1, T x2, T y2, T z2);

Δφ

Header file: #include "DataFormats/Math/interface/deltaPhi.h"

  • Δφ of two azimuthal angles:
      double deltaPhi (double phi1, double phi2); 

Normalized φ

Header file: #include "DataFormats/Math/interface/normalizedPhi.h"

  • return an azimuthal angle φ normalized between -π and +π:
      double normalizedPhi(double phi);

requires to link against the library PhysicsToolsUtilities


BenediktHegner - 06 May 2009

Responsible: LucaLista

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Topic revision: r7 - 2009-05-06 - BenediktHegner



 
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