 double               
  D2                      5x5                     200  double               
  T                     456x456                 18216  double     sparse    
  X                    2730x1                   21840  double               
  Y                    2730x1                   21840  double               
  ai                1249731x1                 9997848  double               
  aj                  71959x1                  575672  double               
  ans                     1