Blaze 3.9
orglq.h
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1//=================================================================================================
33//=================================================================================================
34
35#ifndef _BLAZE_MATH_LAPACK_ORGLQ_H_
36#define _BLAZE_MATH_LAPACK_ORGLQ_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 LQ DECOMPOSITION (ORGLQ)
63//
64//=================================================================================================
65
66//*************************************************************************************************
69template< typename MT, bool SO >
70void orglq( DenseMatrix<MT,SO>& A, const ElementType_t<MT>* tau );
72//*************************************************************************************************
73
74
75//*************************************************************************************************
117template< typename MT, bool SO >
118inline void orglq( DenseMatrix<MT,SO>& A, const ElementType_t<MT>* tau )
119{
126
127 using ET = ElementType_t<MT>;
128
129 blas_int_t m ( numeric_cast<blas_int_t>( SO ? (*A).rows() : (*A).columns() ) );
130 blas_int_t n ( numeric_cast<blas_int_t>( SO ? (*A).columns() : (*A).rows() ) );
131 blas_int_t k ( min( m, n ) );
132 blas_int_t lda ( numeric_cast<blas_int_t>( (*A).spacing() ) );
133 blas_int_t info( 0 );
134
135 if( k == 0 ) {
136 return;
137 }
138
139 blas_int_t lwork( k*lda );
140 const std::unique_ptr<ET[]> work( new ET[lwork] );
141
142 if( SO ) {
143 orglq( k, n, k, (*A).data(), lda, tau, work.get(), lwork, &info );
144 }
145 else {
146 orgqr( m, k, k, (*A).data(), lda, tau, work.get(), lwork, &info );
147 }
148
149 BLAZE_INTERNAL_ASSERT( info == 0, "Invalid argument for Q reconstruction" );
150}
151//*************************************************************************************************
152
153} // namespace blaze
154
155#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 orglq wrapper functions.
Header file for the CLAPACK orgqr 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 orglq(DenseMatrix< MT, SO > &A, const ElementType_t< MT > *tau)
LAPACK kernel for the reconstruction of the orthogonal matrix Q from a LQ decomposition.
Definition: orglq.h:118
void orgqr(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 lwork, blas_int_t *info)
LAPACK kernel for the reconstruction of the orthogonal matrix Q from a QR decomposition.
Definition: orgqr.h:125
#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