本文整理汇总了C++中teuchos::LAPACK::GEQRF方法的典型用法代码示例。如果您正苦于以下问题：C++ LAPACK::GEQRF方法的具体用法？C++ LAPACK::GEQRF怎么用？C++ LAPACK::GEQRF使用的例子？那么恭喜您, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在类teuchos::LAPACK的用法示例。
在下文中一共展示了LAPACK::GEQRF方法的1个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的C++代码示例。
示例1: K
Stokhos::MonoProjPCEBasis<ordinal_type, value_type>::
MonoProjPCEBasis(
ordinal_type p,
const Stokhos::OrthogPolyApprox<ordinal_type, value_type>& pce,
const Stokhos::Quadrature<ordinal_type, value_type>& quad,
const Stokhos::Sparse3Tensor<ordinal_type, value_type>& Cijk,
bool limit_integration_order_) :
RecurrenceBasis<ordinal_type, value_type>("Monomial Projection", p, true),
limit_integration_order(limit_integration_order_),
pce_sz(pce.basis()->size()),
pce_norms(pce.basis()->norm_squared()),
a(pce_sz),
b(pce_sz),
basis_vecs(pce_sz, p+1),
new_pce(p+1)
{
// If the original basis is normalized, we can use the standard QR
// factorization. For simplicity, we renormalize the PCE coefficients
// for a normalized basis
Stokhos::OrthogPolyApprox<ordinal_type, value_type> normalized_pce(pce);
for (ordinal_type i=0; i<pce_sz; i++) {
pce_norms[i] = std::sqrt(pce_norms[i]);
normalized_pce[i] *= pce_norms[i];
}
// Evaluate PCE at quad points
ordinal_type nqp = quad.size();
Teuchos::Array<value_type> pce_vals(nqp);
const Teuchos::Array<value_type>& weights = quad.getQuadWeights();
const Teuchos::Array< Teuchos::Array<value_type> >& quad_points =
quad.getQuadPoints();
const Teuchos::Array< Teuchos::Array<value_type> >& basis_values =
quad.getBasisAtQuadPoints();
for (ordinal_type i=0; i<nqp; i++) {
pce_vals[i] = normalized_pce.evaluate(quad_points[i], basis_values[i]);
}
// Form Kylov matrix up to order pce_sz
matrix_type K(pce_sz, pce_sz);
// Compute matrix
matrix_type A(pce_sz, pce_sz);
typedef Stokhos::Sparse3Tensor<ordinal_type, value_type> Cijk_type;
for (typename Cijk_type::k_iterator k_it = Cijk.k_begin();
k_it != Cijk.k_end(); ++k_it) {
ordinal_type k = index(k_it);
for (typename Cijk_type::kj_iterator j_it = Cijk.j_begin(k_it);
j_it != Cijk.j_end(k_it); ++j_it) {
ordinal_type j = index(j_it);
value_type val = 0;
for (typename Cijk_type::kji_iterator i_it = Cijk.i_begin(j_it);
i_it != Cijk.i_end(j_it); ++i_it) {
ordinal_type i = index(i_it);
value_type c = value(i_it) / (pce_norms[j]*pce_norms[k]);
val += pce[i]*c;
}
A(k,j) = val;
}
}
// Each column i is given by projection of the i-th order monomial
// onto original basis
vector_type u0 = Teuchos::getCol(Teuchos::View, K, 0);
u0(0) = 1.0;
for (ordinal_type i=1; i<pce_sz; i++)
u0(i) = 0.0;
for (ordinal_type k=1; k<pce_sz; k++) {
vector_type u = Teuchos::getCol(Teuchos::View, K, k);
vector_type up = Teuchos::getCol(Teuchos::View, K, k-1);
u.multiply(Teuchos::NO_TRANS, Teuchos::NO_TRANS, 1.0, A, up, 0.0);
}
/*
for (ordinal_type j=0; j<pce_sz; j++) {
for (ordinal_type i=0; i<pce_sz; i++) {
value_type val = 0.0;
for (ordinal_type k=0; k<nqp; k++)
val += weights[k]*std::pow(pce_vals[k],j)*basis_values[k][i];
K(i,j) = val;
}
}
*/
std::cout << K << std::endl << std::endl;
// Compute QR factorization of K
ordinal_type ws_size, info;
value_type ws_size_query;
Teuchos::Array<value_type> tau(pce_sz);
Teuchos::LAPACK<ordinal_type,value_type> lapack;
lapack.GEQRF(pce_sz, pce_sz, K.values(), K.stride(), &tau[0],
&ws_size_query, -1, &info);
TEUCHOS_TEST_FOR_EXCEPTION(info != 0, std::logic_error,
"GEQRF returned value " << info);
ws_size = static_cast<ordinal_type>(ws_size_query);
Teuchos::Array<value_type> work(ws_size);
lapack.GEQRF(pce_sz, pce_sz, K.values(), K.stride(), &tau[0],
&work[0], ws_size, &info);
TEUCHOS_TEST_FOR_EXCEPTION(info != 0, std::logic_error,
"GEQRF returned value " << info);
//.........这里部分代码省略.........