/usr/include/trilinos/Stokhos_KL_ProductEigenPair.hpp is in libtrilinos-stokhos-dev 12.10.1-3.
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#ifndef STOKHOS_KL_PRODUCT_EIGENPAIR_HPP
#define STOKHOS_KL_PRODUCT_EIGENPAIR_HPP
#include "Teuchos_Array.hpp"
namespace Stokhos {
namespace KL {
//! Container for multi-dimensional product of 1-D eigenfunctions/values
template <typename eigen_function_type, typename ExecutionSpace>
struct ProductEigenPair {
typedef typename eigen_function_type::value_type value_type;
typedef ExecutionSpace execution_space;
typedef OneDEigenPair<eigen_function_type> one_d_eigen_pair_type;
typedef Teuchos::Array<one_d_eigen_pair_type> eig_pair_type;
//! Product eigenvalue
value_type eig_val;
//! Eigenpairs for each dimension
eig_pair_type eig_pairs;
//! Default constructor
ProductEigenPair() : eig_val(0.0), eig_pairs() {}
//! Copy constructor
ProductEigenPair(const ProductEigenPair& ep) :
eig_val(ep.eig_val), eig_pairs(ep.eig_pairs) {}
//! Assignment
ProductEigenPair& operator=(const ProductEigenPair& ep) {
if (this != &ep) {
eig_val = ep.eig_val;
eig_pairs = ep.eig_pairs;
}
return *this;
}
//! Set eigen pairs
void set(const Teuchos::Array<one_d_eigen_pair_type>& ep) {
eig_val = 1.0;
eig_pairs = ep;
std::size_t sz = eig_pairs.size();
for (std::size_t i=0; i<sz; i++)
eig_val *= eig_pairs[i].eig_val;
}
//! Evaluate eigenfunction at a given point
template <typename point_type>
KOKKOS_INLINE_FUNCTION
value_type evalEigenfunction(const point_type& x) const {
value_type result = 1.0;
std::size_t sz = eig_pairs.size();
for (std::size_t i=0; i<sz; i++)
result *= eig_pairs[i].eig_func.evaluate(x[i]);
return result;
}
//! Print eigenpair
void print(std::ostream& os) const {
os << eig_val << ", ";
std::size_t sz = eig_pairs.size();
for (std::size_t i=0; i<sz-1; i++) {
os << "(";
eig_pairs[i].eig_func.print(os);
os << ") * ";
}
os << "(";
eig_pairs[eig_pairs.size()-1].eig_func.print(os);
os << ")";
}
};
template <typename E, typename D>
std::ostream&
operator << (std::ostream& os, const ProductEigenPair<E,D>& f) {
f.print(os);
return os;
}
//! Predicate class for sorting product eigenfunctions based on eigenvalue
template <typename E, typename D>
struct ProductEigenPairGreater :
public std::binary_function<ProductEigenPair<E,D>,
ProductEigenPair<E,D>,
bool> {
bool operator() (const ProductEigenPair<E,D>& a,
const ProductEigenPair<E,D>& b) {
return a.eig_val > b.eig_val;
}
}; // struct ProductEigenPairGreater
} // namespace KL
} // namespace Stokhos
#endif // STOKHOS_KL_PRODUCT_EIGENPAIR_HPP
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