std::vector<typename MAT::type>
cal_det_as_vector(const O& creation_operators, const O& annihilation_operators, MAT& M, double BETA, const G& F) {
typedef typename MAT::type SCALAR;
const int size1 = creation_operators.size();
if (size1 == 0) {
throw std::runtime_error("size is zero in cal_det_as_vector");
}
assert(creation_operators.size() == annihilation_operators.size());
Eigen::Matrix<SCALAR, Eigen::Dynamic, Eigen::Dynamic> matrix(size1, size1);
construct_blas_matrix(matrix, creation_operators, annihilation_operators, BETA, F);
Eigen::FullPivLU<Eigen::Matrix<SCALAR, Eigen::Dynamic, Eigen::Dynamic> > lu(matrix);
std::vector<SCALAR> results(size1);
for (int i = 0; i < size1; ++i) {
results[i] = lu.matrixLU()(i,i);
}
results[0] *= lu.permutationP().determinant()*lu.permutationQ().determinant();
M.destructive_resize(size1, size1);
if (size1 > 0) {
M.block() = matrix;
M.safe_invert();
}
return results;
}
double update_inverse_matrix_global_shift(const MAT & M, MAT & M_new, const operator_container_t &creation_operators,
const operator_container_t &annihilation_operators, double BETA, double dtau)
{
typedef boost::tuple<double,int,double> key_t;
typedef std::set<key_t> map_t;
map_t annset, crset;
double det_rat = 1.0;
det_rat *= make_set_impl(annihilation_operators, BETA, dtau, annset);
det_rat *= make_set_impl(creation_operators, BETA, dtau, crset);
M_new.destructive_resize(M.size1(), M.size2());
int row = -1;
int column = -1;
for (map_t::iterator ita = annset.begin(); ita != annset.end(); ita++) {
column++;
for (map_t::iterator itc = crset.begin(); itc != crset.end(); itc++) {
row++;
M_new(row, column) = M(boost::get<1>(*itc), boost::get<1>(*ita))*
boost::get<2>(*itc)*boost::get<2>(*ita);
}
row = -1;
}
return det_rat;
}
RET
cal_det(const O& creation_operators, const O& annihilation_operators, MAT& M, double BETA, const G& F) {
typedef typename MAT::type SCALAR;
const int size1 = creation_operators.size();
if (size1==0) return RET(1.0);
assert(creation_operators.size()==annihilation_operators.size());
Eigen::Matrix<SCALAR,Eigen::Dynamic,Eigen::Dynamic> matrix(size1,size1);
construct_blas_matrix(matrix, creation_operators, annihilation_operators, BETA, F);
RET det = safe_determinant<RET>(matrix);
M.destructive_resize(size1,size1);
if (size1>0) {
M.block() = matrix;
M.safe_invert();
}
return det;
}
