本文整理汇总了C++中AbstractLinAlgPack::BFGS_sTy_suff_p_d方法的典型用法代码示例。如果您正苦于以下问题：C++ AbstractLinAlgPack::BFGS_sTy_suff_p_d方法的具体用法？C++ AbstractLinAlgPack::BFGS_sTy_suff_p_d怎么用？C++ AbstractLinAlgPack::BFGS_sTy_suff_p_d使用的例子？那么, 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AbstractLinAlgPack的用法示例。
在下文中一共展示了AbstractLinAlgPack::BFGS_sTy_suff_p_d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: secant_update
void MatrixSymPosDefLBFGS::secant_update(
VectorMutable* s, VectorMutable* y, VectorMutable* Bs
)
{
using AbstractLinAlgPack::BFGS_sTy_suff_p_d;
using AbstractLinAlgPack::dot;
using LinAlgOpPack::V_MtV;
using Teuchos::Workspace;
Teuchos::WorkspaceStore* wss = Teuchos::get_default_workspace_store().get();
assert_initialized();
// Check skipping the BFGS update
const value_type
sTy = dot(*s,*y);
std::ostringstream omsg;
if( !BFGS_sTy_suff_p_d(*s,*y,&sTy,&omsg,"MatrixSymPosDefLBFGS::secant_update(...)" ) ) {
throw UpdateSkippedException( omsg.str() );
}
try {
// Update counters
if( m_bar_ == m_ ) {
// We are at the end of the storage so remove the oldest stored update
// and move updates to make room for the new update. This has to be done for the
// the matrix to behave properly
{for( size_type k = 1; k <= m_-1; ++k ) {
S_->col(k) = S_->col(k+1); // Shift S.col() to the left
Y_->col(k) = Y_->col(k+1); // Shift Y.col() to the left
STY_.col(k)(1,m_-1) = STY_.col(k+1)(2,m_); // Move submatrix STY(2,m-1,2,m-1) up and left
STSYTY_.col(k)(k+1,m_) = STSYTY_.col(k+1)(k+2,m_+1); // Move triangular submatrix STS(2,m-1,2,m-1) up and left
STSYTY_.col(k+1)(1,k) = STSYTY_.col(k+2)(2,k+1); // Move triangular submatrix YTY(2,m-1,2,m-1) up and left
}}
// ToDo: Create an abstract interface, call it MultiVectorShiftVecs, to rearrange S and Y all at once.
// This will be important for parallel performance.
}
else {
m_bar_++;
}
// Set the update vectors
*S_->col(m_bar_) = *s;
*Y_->col(m_bar_) = *y;
// /////////////////////////////////////////////////////////////////////////////////////
// Update S'Y
//
// Update the row and column m_bar
//
// S'Y =
//
// [ s(1)'*y(1) ... s(1)'*y(m_bar) ... s(1)'*y(m_bar) ]
// [ . . . ] row
// [ s(m_bar)'*y(1) ... s(m_bar)'*y(m_bar) ... s(m_bar)'*y(m_bar) ] m_bar
// [ . . . ]
// [ s(m_bar)'*y(1) ... s(m_bar)'*y(m_bar) ... s(m_bar)'*y(m_bar) ]
//
// col m_bar
//
// Therefore we set:
// (S'Y)(:,m_bar) = S'*y(m_bar)
// (S'Y)(m_bar,:) = s(m_bar)'*Y
const multi_vec_ptr_t
S = this->S(),
Y = this->Y();
VectorSpace::vec_mut_ptr_t
t = S->space_rows().create_member(); // temporary workspace
// (S'Y)(:,m_bar) = S'*y(m_bar)
V_MtV( t.get(), *S, BLAS_Cpp::trans, *y );
STY_.col(m_bar_)(1,m_bar_) = VectorDenseEncap(*t)();
// (S'Y)(m_bar,:)' = Y'*s(m_bar)
V_MtV( t.get(), *Y, BLAS_Cpp::trans, *s );
STY_.row(m_bar_)(1,m_bar_) = VectorDenseEncap(*t)();
// /////////////////////////////////////////////////////////////////
// Update S'S
//
// S'S =
//
// [ s(1)'*s(1) ... symmetric symmetric ]
// [ . . . ] row
// [ s(m_bar)'*s(1) ... s(m_bar)'*s(m_bar) ... symmetric ] m_bar
// [ . . . ]
// [ s(m_bar)'*s(1) ... s(m_bar)'*s(m_bar) ... s(m_bar)'*s(m_bar) ]
//
// col m_bar
//
// Here we will update the lower triangular part of S'S. To do this we
// only need to compute:
// t = S'*s(m_bar) = { s(m_bar)' * [ s(1),..,s(m_bar),..,s(m_bar) ] }'
// then set the appropriate rows and columns of S'S.
Workspace<value_type> work_ws(wss,m_bar_);
DVectorSlice work(&work_ws[0],work_ws.size());
// work = S'*s(m_bar)
//.........这里部分代码省略.........