Blaze 3.9
ung2r.h
Go to the documentation of this file.
1//=================================================================================================
33//=================================================================================================
34
35#ifndef _BLAZE_MATH_LAPACK_UNG2R_H_
36#define _BLAZE_MATH_LAPACK_UNG2R_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 QR DECOMPOSITION (UNG2R)
63//
64//=================================================================================================
65
66//*************************************************************************************************
69template< typename MT, bool SO >
70void ung2r( DenseMatrix<MT,SO>& A, const ElementType_t<MT>* tau );
72//*************************************************************************************************
73
74
75//*************************************************************************************************
119template< typename MT, bool SO >
120inline void ung2r( DenseMatrix<MT,SO>& A, const ElementType_t<MT>* tau )
121{
128
129 using ET = ElementType_t<MT>;
130
131 blas_int_t m ( numeric_cast<blas_int_t>( SO ? (*A).rows() : (*A).columns() ) );
132 blas_int_t n ( numeric_cast<blas_int_t>( SO ? (*A).columns() : (*A).rows() ) );
133 blas_int_t k ( min( m, n ) );
134 blas_int_t lda ( numeric_cast<blas_int_t>( (*A).spacing() ) );
135 blas_int_t info( 0 );
136
137 if( k == 0 ) {
138 return;
139 }
140
141 const std::unique_ptr<ET[]> work( new ET[n] );
142
143 if( SO ) {
144 ung2r( m, k, k, (*A).data(), lda, tau, work.get(), &info );
145 }
146 else {
147 ungl2( k, n, k, (*A).data(), lda, tau, work.get(), &info );
148 }
149
150 BLAZE_INTERNAL_ASSERT( info == 0, "Invalid argument for Q reconstruction" );
151}
152//*************************************************************************************************
153
154} // namespace blaze
155
156#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.
Cast operators for numeric types.
Header file for the CLAPACK ung2r wrapper functions.
Header file for the CLAPACK ungl2 wrapper functions.
Base class for dense matrices.
Definition: DenseMatrix.h:82
Constraint on the data type.
Constraint on the data type.
Header file for the DenseMatrix base class.
#define BLAZE_CONSTRAINT_MUST_BE_COMPLEX_TYPE(T)
Constraint on the data type.
Definition: Complex.h:62
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 ungl2(blas_int_t m, blas_int_t n, blas_int_t k, complex< float > *A, blas_int_t lda, const complex< float > *tau, complex< float > *work, blas_int_t *info)
LAPACK kernel for the reconstruction of the orthogonal matrix Q from a LQ decomposition.
Definition: ungl2.h:122
void ung2r(DenseMatrix< MT, SO > &A, const ElementType_t< MT > *tau)
LAPACK kernel for the reconstruction of the orthogonal matrix Q from a QR decomposition.
Definition: ung2r.h:120
#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