unglq.h
Go to the documentation of this file.
1 //=================================================================================================
33 //=================================================================================================
34 
35 #ifndef _BLAZE_MATH_LAPACK_UNGLQ_H_
36 #define _BLAZE_MATH_LAPACK_UNGLQ_H_
37 
38 
39 //*************************************************************************************************
40 // Includes
41 //*************************************************************************************************
42 
43 #include <memory>
44 #include <boost/cast.hpp>
45 #include <blaze/math/Aliases.h>
53 #include <blaze/util/Assert.h>
55 
56 
57 namespace blaze {
58 
59 //=================================================================================================
60 //
61 // LAPACK FUNCTIONS TO RECONSTRUCT Q FROM A LQ DECOMPOSITION (UNGLQ)
62 //
63 //=================================================================================================
64 
65 //*************************************************************************************************
68 template< typename MT, bool SO >
69 inline void unglq( DenseMatrix<MT,SO>& A, const ElementType_<MT>* tau );
71 //*************************************************************************************************
72 
73 
74 //*************************************************************************************************
117 template< typename MT, bool SO >
118 inline void unglq( DenseMatrix<MT,SO>& A, const ElementType_<MT>* tau )
119 {
120  using boost::numeric_cast;
121 
127 
128  typedef ElementType_<MT> ET;
129 
130  int m ( numeric_cast<int>( SO ? (~A).rows() : (~A).columns() ) );
131  int n ( numeric_cast<int>( SO ? (~A).columns() : (~A).rows() ) );
132  int k ( min( m, n ) );
133  int lda ( numeric_cast<int>( (~A).spacing() ) );
134  int info( 0 );
135 
136  if( k == 0 ) {
137  return;
138  }
139 
140  int lwork( k*lda );
141  const std::unique_ptr<ET[]> work( new ET[lwork] );
142 
143  if( SO ) {
144  unglq( k, n, k, (~A).data(), lda, tau, work.get(), lwork, &info );
145  }
146  else {
147  ungqr( m, k, k, (~A).data(), lda, tau, work.get(), lwork, &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.
Log level for high-level information.
Definition: LogLevel.h:80
void ungqr(int m, int n, int k, complex< float > *A, int lda, const complex< float > *tau, complex< float > *work, int lwork, int *info)
LAPACK kernel for the reconstruction of the orthogonal matrix Q from a QR decomposition.
Definition: ungqr.h:117
#define BLAZE_CONSTRAINT_MUST_HAVE_MUTABLE_DATA_ACCESS(T)
Constraint on the data type.In case the given data type T does not provide low-level data access to m...
Definition: MutableDataAccess.h:61
#define BLAZE_CONSTRAINT_MUST_NOT_BE_COMPUTATION_TYPE(T)
Constraint on the data type.In case the given data type T is a computational expression (i...
Definition: Computation.h:81
Constraint on the data type.
const ElementType_< MT > min(const DenseMatrix< MT, SO > &dm)
Returns the smallest element of the dense matrix.
Definition: DenseMatrix.h:1669
Constraint on the data type.
#define BLAZE_CONSTRAINT_MUST_NOT_BE_ADAPTOR_TYPE(T)
Constraint on the data type.In case the given data type T is an adaptor type (as for instance LowerMa...
Definition: Adaptor.h:81
Base class for dense matrices.The DenseMatrix class is a base class for all dense matrix classes...
Definition: DenseMatrix.h:70
constexpr bool spacing
Adding an additional spacing line between two log messages.This setting gives the opportunity to add ...
Definition: Logging.h:70
Constraint on the data type.
Namespace of the Blaze C++ math library.
Definition: Blaze.h:57
Header file for the DenseMatrix base class.
typename T::ElementType ElementType_
Alias declaration for nested ElementType type definitions.The ElementType_ alias declaration provides...
Definition: Aliases.h:163
BLAZE_ALWAYS_INLINE size_t columns(const Matrix< MT, SO > &matrix) noexcept
Returns the current number of columns of the matrix.
Definition: Matrix.h:330
Constraint on the data type.
Header file for the CLAPACK ungqr wrapper functions.
Header file for run time assertion macros.
#define BLAZE_CONSTRAINT_MUST_BE_BLAS_COMPATIBLE_TYPE(T)
Constraint on the data type.In case the given data type T is not a BLAS compatible data type (i...
Definition: BLASCompatible.h:61
BLAZE_ALWAYS_INLINE size_t rows(const Matrix< MT, SO > &matrix) noexcept
Returns the current number of rows of the matrix.
Definition: Matrix.h:314
#define BLAZE_CONSTRAINT_MUST_BE_COMPLEX_TYPE(T)
Constraint on the data type.This compile time constraint checks that the given data type T is a compl...
Definition: Complex.h:62
Header file for the CLAPACK unglq wrapper functions.
void unglq(int m, int n, int k, complex< float > *A, int lda, const complex< float > *tau, complex< float > *work, int lwork, int *info)
LAPACK kernel for the reconstruction of the orthogonal matrix Q from a LQ decomposition.
Definition: unglq.h:117
#define BLAZE_INTERNAL_ASSERT(expr, msg)
Run time assertion macro for internal checks.In case of an invalid run time expression, the program execution is terminated. The BLAZE_INTERNAL_ASSERT macro can be disabled by setting the BLAZE_USER_ASSERTION flag to zero or by defining NDEBUG during the compilation.
Definition: Assert.h:101