TMatrixTCramerInv

Class Description

                                                                      
 TMatrixTCramerInv                                                    
                                                                      
 Encapsulate templates of Cramer Inversion routines.                  
                                                                      
 The 4x4, 5x5 and 6x6 are adapted from routines written by            
 Mark Fischler and Steven Haywood as part of the CLHEP package        
                                                                      
 Although for sizes <= 6x6 the Cramer Inversion has a gain in speed   
 compared to factorization schemes (like LU) , one pays a price in    
 accuracy  .                                                          
                                                                      
 For Example:                                                         
  H * H^-1 = U, where H is a 5x5 Hilbert matrix                       
                      U is a 5x5 Unity matrix                         
                                                                      
 LU    : |U_jk| < 10e-13 for  j!=k                                    
 Cramer: |U_jk| < 10e-7  for  j!=k                                    
                                                                      
  however Cramer algorithm is about 10 (!) times faster