Blaze 3.9
org2l.h
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1//=================================================================================================
33//=================================================================================================
34
35#ifndef _BLAZE_MATH_LAPACK_ORG2L_H_
36#define _BLAZE_MATH_LAPACK_ORG2L_H_
37
38
39//*************************************************************************************************
40// Includes
41//*************************************************************************************************
42
43#include <memory>
44#include <blaze/math/Aliases.h>
53#include <blaze/util/Assert.h>
56
57
58namespace blaze {
59
60//=================================================================================================
61//
62// LAPACK FUNCTIONS TO RECONSTRUCT Q FROM A QL DECOMPOSITION (ORG2L)
63//
64//=================================================================================================
65
66//*************************************************************************************************
69template< typename MT, bool SO >
70void org2l( DenseMatrix<MT,SO>& A, const ElementType_t<MT>* tau );
72//*************************************************************************************************
73
74
75//*************************************************************************************************
118template< typename MT, bool SO >
119inline void org2l( DenseMatrix<MT,SO>& A, const ElementType_t<MT>* tau )
120{
127
128 using ET = ElementType_t<MT>;
129
130 blas_int_t m ( numeric_cast<blas_int_t>( SO ? (*A).rows() : (*A).columns() ) );
131 blas_int_t n ( numeric_cast<blas_int_t>( SO ? (*A).columns() : (*A).rows() ) );
132 blas_int_t k ( min( m, n ) );
133 blas_int_t lda ( numeric_cast<blas_int_t>( (*A).spacing() ) );
134 blas_int_t info( 0 );
135
136 if( k == 0 ) {
137 return;
138 }
139
140 const std::unique_ptr<ET[]> work( new ET[n] );
141
142 if( SO ) {
143 const size_t offset( static_cast<size_t>( ( m < n )?( n - m ):( 0 ) ) );
144 org2l( m, k, k, (*A).data(offset), lda, tau, work.get(), &info );
145 }
146 else {
147 const size_t offset( static_cast<size_t>( ( m > n )?( m - n ):( 0 ) ) );
148 orgr2( k, n, k, (*A).data()+offset, lda, tau, work.get(), &info );
149 }
150
151 BLAZE_INTERNAL_ASSERT( info == 0, "Invalid argument for Q reconstruction" );
152}
153//*************************************************************************************************
154
155} // namespace blaze
156
157#endif
Constraint on the data type.
Header file for auxiliary alias declarations.
typename T::ElementType ElementType_t
Alias declaration for nested ElementType type definitions.
Definition: Aliases.h:190
Header file for run time assertion macros.
Constraint on the data type.
Constraint on the data type.
Constraint on the data type.
Constraint on the data type.
Cast operators for numeric types.
Header file for the CLAPACK org2l wrapper functions.
Header file for the CLAPACK orgr2 wrapper functions.
Base class for dense matrices.
Definition: DenseMatrix.h:82
Constraint on the data type.
Header file for the DenseMatrix base class.
#define BLAZE_CONSTRAINT_MUST_BE_BUILTIN_TYPE(T)
Constraint on the data type.
Definition: Builtin.h:60
decltype(auto) min(const DenseMatrix< MT1, SO1 > &lhs, const DenseMatrix< MT2, SO2 > &rhs)
Computes the componentwise minimum of the dense matrices lhs and rhs.
Definition: DMatDMatMapExpr.h:1339
void org2l(DenseMatrix< MT, SO > &A, const ElementType_t< MT > *tau)
LAPACK kernel for the reconstruction of the orthogonal matrix Q from a QL decomposition.
Definition: org2l.h:119
void orgr2(blas_int_t m, blas_int_t n, blas_int_t k, float *A, blas_int_t lda, const float *tau, float *work, blas_int_t *info)
LAPACK kernel for the reconstruction of the orthogonal matrix Q from a RQ decomposition.
Definition: orgr2.h:122
#define BLAZE_CONSTRAINT_MUST_BE_BLAS_COMPATIBLE_TYPE(T)
Constraint on the data type.
Definition: BLASCompatible.h:61
#define BLAZE_CONSTRAINT_MUST_BE_CONTIGUOUS_TYPE(T)
Constraint on the data type.
Definition: Contiguous.h:61
#define BLAZE_CONSTRAINT_MUST_NOT_BE_COMPUTATION_TYPE(T)
Constraint on the data type.
Definition: Computation.h:81
#define BLAZE_CONSTRAINT_MUST_NOT_BE_ADAPTOR_TYPE(T)
Constraint on the data type.
Definition: Adaptor.h:81
#define BLAZE_CONSTRAINT_MUST_HAVE_MUTABLE_DATA_ACCESS(T)
Constraint on the data type.
Definition: MutableDataAccess.h:61
int32_t blas_int_t
Signed integer type used in the BLAS/LAPACK wrapper functions.
Definition: Types.h:64
#define BLAZE_INTERNAL_ASSERT(expr, msg)
Run time assertion macro for internal checks.
Definition: Assert.h:101