_dgematrix-calc.hpp File Reference

Go to the source code of this file.

Functions
_dgematrix	t (const _dgematrix &mat)
_dgematrix	i (const _dgematrix &mat)
void	idamax (CPPL_INT &i, CPPL_INT &j, const _dgematrix &mat)
double	damax (const _dgematrix &mat)

Function Documentation

_dgematrix t ( const _dgematrix &  mat )

inline

return transposed dgematrix

Definition at line 3 of file _dgematrix-calc.hpp.

References _(), _dgematrix::destroy(), i(), dgematrix::m, _dgematrix::m, _dgematrix::n, and dgematrix::n.

{CPPL_VERBOSE_REPORT;
  dgematrix newmat(mat.n,mat.m);
  
  for(CPPL_INT i=0; i<newmat.m; i++){
    for(CPPL_INT j=0; j<newmat.n; j++){
      newmat(i,j) =mat(j,i);
    }
  }
  
  mat.destroy();
  return _(newmat);
}

_dgematrix i ( const _dgematrix &  mat )

inline

return its inverse matrix

Definition at line 19 of file _dgematrix-calc.hpp.

References _(), dgematrix::dgesv(), dgematrix::identity(), _dgematrix::m, dgematrix::m, dgematrix::n, and _dgematrix::n.

Referenced by t().

{CPPL_VERBOSE_REPORT;
#ifdef  CPPL_DEBUG
  if(mat.m!=mat.n){
    ERROR_REPORT;
    std::cerr << "This matrix is not square and has no inverse matrix." << std::endl
              << "Your input was (" << mat.m << "x" << mat.n << ")." << std::endl;
    exit(1);
  }
#endif//CPPL_DEBUG
  
  dgematrix mat_cp(mat);
  dgematrix mat_inv(mat_cp.m,mat_cp.n);
  mat_inv.identity();
  mat_cp.dgesv(mat_inv);
  
  return _(mat_inv);
}

void idamax ( CPPL_INT &  i, CPPL_INT &  j, const _dgematrix &  mat  )

inline

search the index of element having the largest absolute value in 0-based numbering system

Definition at line 45 of file _dgematrix-calc.hpp.

References _dgematrix::array, _dgematrix::destroy(), _dgematrix::m, and _dgematrix::n.

{CPPL_VERBOSE_REPORT;
  CPPL_INT mn =mat.m*mat.n;
  CPPL_INT inc =1;
  CPPL_INT index =idamax_(&mn, mat.array, &inc) -1;
  i =index%mat.m;
  j =index/mat.m;
  
  mat.destroy();
}

double damax ( const _dgematrix &  mat )

inline

return its largest absolute value

Definition at line 58 of file _dgematrix-calc.hpp.

References _dgematrix::array, _dgematrix::destroy(), _dgematrix::m, and _dgematrix::n.

{CPPL_VERBOSE_REPORT;
  CPPL_INT mn =mat.m*mat.n;
  CPPL_INT inc =1;
  double val =mat.array[idamax_(&mn, mat.array, &inc) -1];
  
  mat.destroy();
  return val;
}