mirror of
https://github.com/triqs/dft_tools
synced 2024-11-01 11:43:47 +01:00
edd1ff4529
A first general restructuration of the doc according to the pattern [tour|tutorial|reference]. In the reference part, objects are documented per topic. In each topic, [definition|c++|python|hdf5] (not yet implemented)
24 lines
1.1 KiB
C++
24 lines
1.1 KiB
C++
#include <triqs/det_manip/det_manip.hpp>
|
|
|
|
struct fun {
|
|
typedef double result_type;
|
|
typedef double argument_type;
|
|
double operator()(double x, double y) const { return (exp(x) - y * y); }
|
|
};
|
|
|
|
int main() {
|
|
triqs::det_manip::det_manip<fun> D(fun(), std::vector<double>{1, 2, 2.5}, std::vector<double>{3, 4, 9});
|
|
std::cout << std::endl << "After construction, D.matrix()=" << D.matrix() << std::endl << std::endl;
|
|
int i0 = 2, i1 = 1, j0 = 0, j1 = 1; // number of the removed lines and columns
|
|
std::cout << "We want to remove 2 lines and 2 columns for i0=" << i0 << ", j0=" << j0 << ", i1=" << i1 << ", j1=" << j1 << "."
|
|
<< std::endl;
|
|
// (try of) removal of a line and a column at position (1,0) in the matrix.
|
|
double detratio = D.try_remove2(i0, i1, j0, j1); // the ratio between new and old determinants
|
|
// while the operation is not complete, the matrix stays unchanged
|
|
std::cout << "After try_remove2, D.matrix()=" << D.matrix() << std::endl;
|
|
// here we validate the removal: the (inverse) matrix and determinant are updated
|
|
D.complete_operation();
|
|
std::cout << "After complete_operation, D.matrix()=" << D.matrix() << std::endl << std::endl;
|
|
}
|
|
|