libroot-math-smatrix-dev 5.34.14-1build1 / usr / include / root / Math / CramerInversionSym.icc

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// @(#)root/smatrix:$Id$
// Authors: L. Moneta    2005  


/**********************************************************************
 *                                                                    *
 * Copyright (c) 2005 , LCG ROOT MathLib Team                         *
 *                                                                    *
 *                                                                    *
 **********************************************************************/
//
// Cramer optmized inversion for symmetric matrices up to size 5x5. 
// Code from ROOT TMatrixDCramerInv which originates from CLHEP 
// (original author Mark Fischler)
//
// Modified by L. Moneta 22/03/07: specialize only until 5x5 (before was up to 6x6) 
//  tests show that on 64 machines (like on slc4) it is faster the general method
//

#ifndef ROOT_Math_CramerInversionSym_icc
#define ROOT_Math_CramerInversionSym_icc

#include <cmath>


namespace ROOT { 

  namespace Math { 




//==============================================================================
/**
   Inversion for a 3x3 symmetric matrix
 */
template <class T> 
bool FastInverter<3>::Dinv(MatRepSym<T,3> & rhs) { 

  typedef T  Scalar; 

  // check matrix sizes ??


  const Scalar c00 = rhs[4] * rhs[8] - rhs[5] * rhs[5];
  const Scalar c01 = rhs[5] * rhs[2] - rhs[1] * rhs[8];
  const Scalar c02 = rhs[1] * rhs[5] - rhs[4] * rhs[2];
  const Scalar c11 = rhs[8] * rhs[0] - rhs[2] * rhs[2];
  const Scalar c12 = rhs[2] * rhs[1] - rhs[5] * rhs[0];
  const Scalar c22 = rhs[0] * rhs[4] - rhs[1] * rhs[1];

  const Scalar t0  = std::abs(rhs[0]);
  const Scalar t1  = std::abs(rhs[1]);
  const Scalar t2  = std::abs(rhs[2]);

  Scalar det;
  Scalar tmp;

  if (t0 >= t1) {
    if (t2 >= t0) {
      tmp = rhs[2];
      det = c12*c01-c11*c02;
    } else {
      tmp = rhs[0];
      det = c11*c22-c12*c12;
    }
  } else if (t2 >= t1) {
    tmp = rhs[2];
    det = c12*c01-c11*c02;
  } else {
    tmp = rhs[1];
    det = c02*c12-c01*c22;
  }

  if ( det == 0 || tmp == 0)
    return false;

  Scalar s = tmp/det;
//   if (determ)
//     *determ = 1./s;

  rhs[0] = s*c00;
  rhs[1] = s*c01;
  rhs[2] = s*c02;
  rhs[4] = s*c11;
  rhs[5] = s*c12;
  rhs[8] = s*c22;
  
  return true;
}


//==============================================================================
// Inversion for 4x4 matrices
//==============================================================================

// SFij are indices for a 4x4 symmetric matrix.

#define SF00 0
#define SF01 1
#define SF02 2
#define SF03 3

#define SF10 1
#define SF11 5
#define SF12 6
#define SF13 7

#define SF20 2
#define SF21 6
#define SF22 10
#define SF23 11

#define SF30 3
#define SF31 7
#define SF32 11
#define SF33 15


/**
   Inversion for a 4x4 symmetric matrix
 */
template <class T> 
bool FastInverter<4>::Dinv(MatRepSym<T,4> & rhs) { 

  typedef T  Scalar; 


  // Find all NECESSARY 2x2 dets:  (14 of them)

  const Scalar mDet2_12_01 = rhs[SF10]*rhs[SF21] - rhs[SF11]*rhs[SF20];
  const Scalar mDet2_12_02 = rhs[SF10]*rhs[SF22] - rhs[SF12]*rhs[SF20];
  const Scalar mDet2_12_12 = rhs[SF11]*rhs[SF22] - rhs[SF12]*rhs[SF21];
  const Scalar mDet2_13_01 = rhs[SF10]*rhs[SF31] - rhs[SF11]*rhs[SF30];
  const Scalar mDet2_13_02 = rhs[SF10]*rhs[SF32] - rhs[SF12]*rhs[SF30];
  const Scalar mDet2_13_03 = rhs[SF10]*rhs[SF33] - rhs[SF13]*rhs[SF30];
  const Scalar mDet2_13_12 = rhs[SF11]*rhs[SF32] - rhs[SF12]*rhs[SF31];
  const Scalar mDet2_13_13 = rhs[SF11]*rhs[SF33] - rhs[SF13]*rhs[SF31];
  const Scalar mDet2_23_01 = rhs[SF20]*rhs[SF31] - rhs[SF21]*rhs[SF30];
  const Scalar mDet2_23_02 = rhs[SF20]*rhs[SF32] - rhs[SF22]*rhs[SF30];
  const Scalar mDet2_23_03 = rhs[SF20]*rhs[SF33] - rhs[SF23]*rhs[SF30];
  const Scalar mDet2_23_12 = rhs[SF21]*rhs[SF32] - rhs[SF22]*rhs[SF31];
  const Scalar mDet2_23_13 = rhs[SF21]*rhs[SF33] - rhs[SF23]*rhs[SF31];
  const Scalar mDet2_23_23 = rhs[SF22]*rhs[SF33] - rhs[SF23]*rhs[SF32];

  // SFind all NECESSSFRY 3x3 dets:   (10 of them)
  
  const Scalar mDet3_012_012 = rhs[SF00]*mDet2_12_12 - rhs[SF01]*mDet2_12_02
                               + rhs[SF02]*mDet2_12_01;
  const Scalar mDet3_013_012 = rhs[SF00]*mDet2_13_12 - rhs[SF01]*mDet2_13_02
                               + rhs[SF02]*mDet2_13_01;
  const Scalar mDet3_013_013 = rhs[SF00]*mDet2_13_13 - rhs[SF01]*mDet2_13_03
                               + rhs[SF03]*mDet2_13_01;
  const Scalar mDet3_023_012 = rhs[SF00]*mDet2_23_12 - rhs[SF01]*mDet2_23_02
                               + rhs[SF02]*mDet2_23_01;
  const Scalar mDet3_023_013 = rhs[SF00]*mDet2_23_13 - rhs[SF01]*mDet2_23_03
                               + rhs[SF03]*mDet2_23_01;
  const Scalar mDet3_023_023 = rhs[SF00]*mDet2_23_23 - rhs[SF02]*mDet2_23_03
                               + rhs[SF03]*mDet2_23_02;
  const Scalar mDet3_123_012 = rhs[SF10]*mDet2_23_12 - rhs[SF11]*mDet2_23_02
                               + rhs[SF12]*mDet2_23_01;
  const Scalar mDet3_123_013 = rhs[SF10]*mDet2_23_13 - rhs[SF11]*mDet2_23_03
                               + rhs[SF13]*mDet2_23_01;
  const Scalar mDet3_123_023 = rhs[SF10]*mDet2_23_23 - rhs[SF12]*mDet2_23_03
                               + rhs[SF13]*mDet2_23_02;
  const Scalar mDet3_123_123 = rhs[SF11]*mDet2_23_23 - rhs[SF12]*mDet2_23_13
                               + rhs[SF13]*mDet2_23_12;

  // Find the 4x4 det:

  const Scalar det = rhs[SF00]*mDet3_123_123 - rhs[SF01]*mDet3_123_023
                       + rhs[SF02]*mDet3_123_013 - rhs[SF03]*mDet3_123_012;

//   if (determ)
//     *determ = det;

  if ( det == 0 )
    return false;

  const Scalar oneOverDet = 1.0f / det;
  const Scalar mn1OverDet = - oneOverDet;

  rhs[SF00] =  mDet3_123_123 * oneOverDet;
  rhs[SF01] =  mDet3_123_023 * mn1OverDet;
  rhs[SF02] =  mDet3_123_013 * oneOverDet;
  rhs[SF03] =  mDet3_123_012 * mn1OverDet;

  rhs[SF11] =  mDet3_023_023 * oneOverDet;
  rhs[SF12] =  mDet3_023_013 * mn1OverDet;
  rhs[SF13] =  mDet3_023_012 * oneOverDet;

  rhs[SF22] =  mDet3_013_013 * oneOverDet;
  rhs[SF23] =  mDet3_013_012 * mn1OverDet;

  rhs[SF33] =  mDet3_012_012 * oneOverDet;

  return true;
}


//==============================================================================
// Inversion for 5x5 matrices
//==============================================================================

// Mij are indices for a 5x5 matrix.
    
#define SM00 0
#define SM01 1
#define SM02 2
#define SM03 3
#define SM04 4
  
#define SM10 1
#define SM11 6
#define SM12 7
#define SM13 8
#define SM14 9

#define SM20 2
#define SM21 7
#define SM22 12
#define SM23 13
#define SM24 14

#define SM30 3
#define SM31 8
#define SM32 13
#define SM33 18
#define SM34 19

#define SM40 4
#define SM41 9
#define SM42 14
#define SM43 19
#define SM44 24

/**
   Inversion for a 5x5 symmetric matrix
 */
template <class T> 
bool FastInverter<5>::Dinv(MatRepSym<T,5> & rhs) { 

  typedef T  Scalar; 

  // Find all NECESSARY 2x2 dets:  (25 of them)

  const Scalar mDet2_23_01 = rhs[SM20]*rhs[SM31] - rhs[SM21]*rhs[SM30];
  const Scalar mDet2_23_02 = rhs[SM20]*rhs[SM32] - rhs[SM22]*rhs[SM30];
  const Scalar mDet2_23_03 = rhs[SM20]*rhs[SM33] - rhs[SM23]*rhs[SM30];
  const Scalar mDet2_23_12 = rhs[SM21]*rhs[SM32] - rhs[SM22]*rhs[SM31];
  const Scalar mDet2_23_13 = rhs[SM21]*rhs[SM33] - rhs[SM23]*rhs[SM31];
  const Scalar mDet2_23_23 = rhs[SM22]*rhs[SM33] - rhs[SM23]*rhs[SM32];
  const Scalar mDet2_24_01 = rhs[SM20]*rhs[SM41] - rhs[SM21]*rhs[SM40];
  const Scalar mDet2_24_02 = rhs[SM20]*rhs[SM42] - rhs[SM22]*rhs[SM40];
  const Scalar mDet2_24_03 = rhs[SM20]*rhs[SM43] - rhs[SM23]*rhs[SM40];
  const Scalar mDet2_24_04 = rhs[SM20]*rhs[SM44] - rhs[SM24]*rhs[SM40];
  const Scalar mDet2_24_12 = rhs[SM21]*rhs[SM42] - rhs[SM22]*rhs[SM41];
  const Scalar mDet2_24_13 = rhs[SM21]*rhs[SM43] - rhs[SM23]*rhs[SM41];
  const Scalar mDet2_24_14 = rhs[SM21]*rhs[SM44] - rhs[SM24]*rhs[SM41];
  const Scalar mDet2_24_23 = rhs[SM22]*rhs[SM43] - rhs[SM23]*rhs[SM42];
  const Scalar mDet2_24_24 = rhs[SM22]*rhs[SM44] - rhs[SM24]*rhs[SM42];
  const Scalar mDet2_34_01 = rhs[SM30]*rhs[SM41] - rhs[SM31]*rhs[SM40];
  const Scalar mDet2_34_02 = rhs[SM30]*rhs[SM42] - rhs[SM32]*rhs[SM40];
  const Scalar mDet2_34_03 = rhs[SM30]*rhs[SM43] - rhs[SM33]*rhs[SM40];
  const Scalar mDet2_34_04 = rhs[SM30]*rhs[SM44] - rhs[SM34]*rhs[SM40];
  const Scalar mDet2_34_12 = rhs[SM31]*rhs[SM42] - rhs[SM32]*rhs[SM41];
  const Scalar mDet2_34_13 = rhs[SM31]*rhs[SM43] - rhs[SM33]*rhs[SM41];
  const Scalar mDet2_34_14 = rhs[SM31]*rhs[SM44] - rhs[SM34]*rhs[SM41];
  const Scalar mDet2_34_23 = rhs[SM32]*rhs[SM43] - rhs[SM33]*rhs[SM42];
  const Scalar mDet2_34_24 = rhs[SM32]*rhs[SM44] - rhs[SM34]*rhs[SM42];
  const Scalar mDet2_34_34 = rhs[SM33]*rhs[SM44] - rhs[SM34]*rhs[SM43];

  // Find all NECESSARY 3x3 dets:   (30 of them)

  const Scalar mDet3_123_012 = rhs[SM10]*mDet2_23_12 - rhs[SM11]*mDet2_23_02 + rhs[SM12]*mDet2_23_01;
  const Scalar mDet3_123_013 = rhs[SM10]*mDet2_23_13 - rhs[SM11]*mDet2_23_03 + rhs[SM13]*mDet2_23_01;
  const Scalar mDet3_123_023 = rhs[SM10]*mDet2_23_23 - rhs[SM12]*mDet2_23_03 + rhs[SM13]*mDet2_23_02;
  const Scalar mDet3_123_123 = rhs[SM11]*mDet2_23_23 - rhs[SM12]*mDet2_23_13 + rhs[SM13]*mDet2_23_12;
  const Scalar mDet3_124_012 = rhs[SM10]*mDet2_24_12 - rhs[SM11]*mDet2_24_02 + rhs[SM12]*mDet2_24_01;
  const Scalar mDet3_124_013 = rhs[SM10]*mDet2_24_13 - rhs[SM11]*mDet2_24_03 + rhs[SM13]*mDet2_24_01;
  const Scalar mDet3_124_014 = rhs[SM10]*mDet2_24_14 - rhs[SM11]*mDet2_24_04 + rhs[SM14]*mDet2_24_01;
  const Scalar mDet3_124_023 = rhs[SM10]*mDet2_24_23 - rhs[SM12]*mDet2_24_03 + rhs[SM13]*mDet2_24_02;
  const Scalar mDet3_124_024 = rhs[SM10]*mDet2_24_24 - rhs[SM12]*mDet2_24_04 + rhs[SM14]*mDet2_24_02;
  const Scalar mDet3_124_123 = rhs[SM11]*mDet2_24_23 - rhs[SM12]*mDet2_24_13 + rhs[SM13]*mDet2_24_12;
  const Scalar mDet3_124_124 = rhs[SM11]*mDet2_24_24 - rhs[SM12]*mDet2_24_14 + rhs[SM14]*mDet2_24_12;
  const Scalar mDet3_134_012 = rhs[SM10]*mDet2_34_12 - rhs[SM11]*mDet2_34_02 + rhs[SM12]*mDet2_34_01;
  const Scalar mDet3_134_013 = rhs[SM10]*mDet2_34_13 - rhs[SM11]*mDet2_34_03 + rhs[SM13]*mDet2_34_01;
  const Scalar mDet3_134_014 = rhs[SM10]*mDet2_34_14 - rhs[SM11]*mDet2_34_04 + rhs[SM14]*mDet2_34_01;
  const Scalar mDet3_134_023 = rhs[SM10]*mDet2_34_23 - rhs[SM12]*mDet2_34_03 + rhs[SM13]*mDet2_34_02;
  const Scalar mDet3_134_024 = rhs[SM10]*mDet2_34_24 - rhs[SM12]*mDet2_34_04 + rhs[SM14]*mDet2_34_02;
  const Scalar mDet3_134_034 = rhs[SM10]*mDet2_34_34 - rhs[SM13]*mDet2_34_04 + rhs[SM14]*mDet2_34_03;
  const Scalar mDet3_134_123 = rhs[SM11]*mDet2_34_23 - rhs[SM12]*mDet2_34_13 + rhs[SM13]*mDet2_34_12;
  const Scalar mDet3_134_124 = rhs[SM11]*mDet2_34_24 - rhs[SM12]*mDet2_34_14 + rhs[SM14]*mDet2_34_12;
  const Scalar mDet3_134_134 = rhs[SM11]*mDet2_34_34 - rhs[SM13]*mDet2_34_14 + rhs[SM14]*mDet2_34_13;
  const Scalar mDet3_234_012 = rhs[SM20]*mDet2_34_12 - rhs[SM21]*mDet2_34_02 + rhs[SM22]*mDet2_34_01;
  const Scalar mDet3_234_013 = rhs[SM20]*mDet2_34_13 - rhs[SM21]*mDet2_34_03 + rhs[SM23]*mDet2_34_01;
  const Scalar mDet3_234_014 = rhs[SM20]*mDet2_34_14 - rhs[SM21]*mDet2_34_04 + rhs[SM24]*mDet2_34_01;
  const Scalar mDet3_234_023 = rhs[SM20]*mDet2_34_23 - rhs[SM22]*mDet2_34_03 + rhs[SM23]*mDet2_34_02;
  const Scalar mDet3_234_024 = rhs[SM20]*mDet2_34_24 - rhs[SM22]*mDet2_34_04 + rhs[SM24]*mDet2_34_02;
  const Scalar mDet3_234_034 = rhs[SM20]*mDet2_34_34 - rhs[SM23]*mDet2_34_04 + rhs[SM24]*mDet2_34_03;
  const Scalar mDet3_234_123 = rhs[SM21]*mDet2_34_23 - rhs[SM22]*mDet2_34_13 + rhs[SM23]*mDet2_34_12;
  const Scalar mDet3_234_124 = rhs[SM21]*mDet2_34_24 - rhs[SM22]*mDet2_34_14 + rhs[SM24]*mDet2_34_12;
  const Scalar mDet3_234_134 = rhs[SM21]*mDet2_34_34 - rhs[SM23]*mDet2_34_14 + rhs[SM24]*mDet2_34_13;
  const Scalar mDet3_234_234 = rhs[SM22]*mDet2_34_34 - rhs[SM23]*mDet2_34_24 + rhs[SM24]*mDet2_34_23;

  // Find all NECESSARY 4x4 dets:   (15 of them)

  const Scalar mDet4_0123_0123 = rhs[SM00]*mDet3_123_123 - rhs[SM01]*mDet3_123_023
                                 + rhs[SM02]*mDet3_123_013 - rhs[SM03]*mDet3_123_012;
  const Scalar mDet4_0124_0123 = rhs[SM00]*mDet3_124_123 - rhs[SM01]*mDet3_124_023
                                 + rhs[SM02]*mDet3_124_013 - rhs[SM03]*mDet3_124_012;
  const Scalar mDet4_0124_0124 = rhs[SM00]*mDet3_124_124 - rhs[SM01]*mDet3_124_024
                                 + rhs[SM02]*mDet3_124_014 - rhs[SM04]*mDet3_124_012;
  const Scalar mDet4_0134_0123 = rhs[SM00]*mDet3_134_123 - rhs[SM01]*mDet3_134_023
                                 + rhs[SM02]*mDet3_134_013 - rhs[SM03]*mDet3_134_012;
  const Scalar mDet4_0134_0124 = rhs[SM00]*mDet3_134_124 - rhs[SM01]*mDet3_134_024
                                 + rhs[SM02]*mDet3_134_014 - rhs[SM04]*mDet3_134_012;
  const Scalar mDet4_0134_0134 = rhs[SM00]*mDet3_134_134 - rhs[SM01]*mDet3_134_034
                                 + rhs[SM03]*mDet3_134_014 - rhs[SM04]*mDet3_134_013;
  const Scalar mDet4_0234_0123 = rhs[SM00]*mDet3_234_123 - rhs[SM01]*mDet3_234_023
                                 + rhs[SM02]*mDet3_234_013 - rhs[SM03]*mDet3_234_012;
  const Scalar mDet4_0234_0124 = rhs[SM00]*mDet3_234_124 - rhs[SM01]*mDet3_234_024
                                 + rhs[SM02]*mDet3_234_014 - rhs[SM04]*mDet3_234_012;
  const Scalar mDet4_0234_0134 = rhs[SM00]*mDet3_234_134 - rhs[SM01]*mDet3_234_034
                                 + rhs[SM03]*mDet3_234_014 - rhs[SM04]*mDet3_234_013;
  const Scalar mDet4_0234_0234 = rhs[SM00]*mDet3_234_234 - rhs[SM02]*mDet3_234_034
                                 + rhs[SM03]*mDet3_234_024 - rhs[SM04]*mDet3_234_023;
  const Scalar mDet4_1234_0123 = rhs[SM10]*mDet3_234_123 - rhs[SM11]*mDet3_234_023
                                 + rhs[SM12]*mDet3_234_013 - rhs[SM13]*mDet3_234_012;
  const Scalar mDet4_1234_0124 = rhs[SM10]*mDet3_234_124 - rhs[SM11]*mDet3_234_024
                                 + rhs[SM12]*mDet3_234_014 - rhs[SM14]*mDet3_234_012;
  const Scalar mDet4_1234_0134 = rhs[SM10]*mDet3_234_134 - rhs[SM11]*mDet3_234_034
                                 + rhs[SM13]*mDet3_234_014 - rhs[SM14]*mDet3_234_013;
  const Scalar mDet4_1234_0234 = rhs[SM10]*mDet3_234_234 - rhs[SM12]*mDet3_234_034
                                 + rhs[SM13]*mDet3_234_024 - rhs[SM14]*mDet3_234_023;
  const Scalar mDet4_1234_1234 = rhs[SM11]*mDet3_234_234 - rhs[SM12]*mDet3_234_134
                                 + rhs[SM13]*mDet3_234_124 - rhs[SM14]*mDet3_234_123;

  // Find the 5x5 det:

  const Scalar det = rhs[SM00]*mDet4_1234_1234 - rhs[SM01]*mDet4_1234_0234 + rhs[SM02]*mDet4_1234_0134
                       - rhs[SM03]*mDet4_1234_0124 + rhs[SM04]*mDet4_1234_0123;
//   if (determ)
//     *determ = det;

  if ( det == 0 )
    return false;

  const Scalar oneOverDet = 1.0f / det;
  const Scalar mn1OverDet = - oneOverDet;

  rhs[SM00] = mDet4_1234_1234 * oneOverDet;
  rhs[SM01] = mDet4_1234_0234 * mn1OverDet;
  rhs[SM02] = mDet4_1234_0134 * oneOverDet;
  rhs[SM03] = mDet4_1234_0124 * mn1OverDet;
  rhs[SM04] = mDet4_1234_0123 * oneOverDet;

  rhs[SM11] = mDet4_0234_0234 * oneOverDet;
  rhs[SM12] = mDet4_0234_0134 * mn1OverDet;
  rhs[SM13] = mDet4_0234_0124 * oneOverDet;
  rhs[SM14] = mDet4_0234_0123 * mn1OverDet;

  rhs[SM22] = mDet4_0134_0134 * oneOverDet;
  rhs[SM23] = mDet4_0134_0124 * mn1OverDet;
  rhs[SM24] = mDet4_0134_0123 * oneOverDet;

  rhs[SM33] = mDet4_0124_0124 * oneOverDet;
  rhs[SM34] = mDet4_0124_0123 * mn1OverDet;

  rhs[SM44] = mDet4_0123_0123 * oneOverDet;


  return true;
}



  }  // namespace Math

}  // namespace ROOT
          

// undef Smacros to avoid conflicts

// undef SF 4x4
#undef SF00 
#undef SF01 
#undef SF02
#undef SF03

#undef SF10
#undef SF11
#undef SF12
#undef SF13

#undef SF20
#undef SF21
#undef SF22
#undef SF23

#undef SF30
#undef SF31
#undef SF32
#undef SF33

// undef SM 5x5
#undef SM00
#undef SM01
#undef SM02
#undef SM03
#undef SM04

#undef SM10
#undef SM11
#undef SM12
#undef SM13
#undef SM14

#undef SM20
#undef SM21
#undef SM22
#undef SM23
#undef SM24

#undef SM30
#undef SM31
#undef SM32
#undef SM33
#undef SM34

#undef SM40
#undef SM41
#undef SM42
#undef SM43
#undef SM44




#endif

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