geqrf.h
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1 //=================================================================================================
33 //=================================================================================================
34 
35 #ifndef _BLAZE_MATH_LAPACK_GEQRF_H_
36 #define _BLAZE_MATH_LAPACK_GEQRF_H_
37 
38 
39 //*************************************************************************************************
40 // Includes
41 //*************************************************************************************************
42 
43 #include <memory>
44 #include <blaze/math/Aliases.h>
52 #include <blaze/util/Assert.h>
53 #include <blaze/util/NumericCast.h>
54 
55 
56 namespace blaze {
57 
58 //=================================================================================================
59 //
60 // LAPACK QR DECOMPOSITION FUNCTIONS (GEQRF)
61 //
62 //=================================================================================================
63 
64 //*************************************************************************************************
67 template< typename MT, bool SO >
68 inline void geqrf( DenseMatrix<MT,SO>& A, ElementType_<MT>* tau );
70 //*************************************************************************************************
71 
72 
73 //*************************************************************************************************
115 template< typename MT // Type of the dense matrix
116  , bool SO > // Storage order of the dense matrix
118 {
123 
124  using ET = ElementType_<MT>;
125 
126  int m ( numeric_cast<int>( SO ? (~A).rows() : (~A).columns() ) );
127  int n ( numeric_cast<int>( SO ? (~A).columns() : (~A).rows() ) );
128  int lda ( numeric_cast<int>( (~A).spacing() ) );
129  int info( 0 );
130 
131  if( m == 0 || n == 0 ) {
132  return;
133  }
134 
135  int lwork( ( SO ? n : m ) * lda );
136  const std::unique_ptr<ET[]> work( new ET[lwork] );
137 
138  if( SO ) {
139  geqrf( m, n, (~A).data(), lda, tau, work.get(), lwork, &info );
140  }
141  else {
142  gelqf( m, n, (~A).data(), lda, tau, work.get(), lwork, &info );
143  }
144 
145  BLAZE_INTERNAL_ASSERT( info == 0, "Invalid argument for QR decomposition" );
146 }
147 //*************************************************************************************************
148 
149 } // namespace blaze
150 
151 #endif
Constraint on the data type.
Header file for auxiliary alias declarations.
#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.
Cast operators for numeric types.
#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:80
Header file for the CLAPACK gelqf wrapper functions.
BLAZE_ALWAYS_INLINE size_t spacing(const DenseMatrix< MT, SO > &dm) noexcept
Returns the spacing between the beginning of two rows/columns.
Definition: DenseMatrix.h:252
Constraint on the data type.
Namespace of the Blaze C++ math library.
Definition: Blaze.h:58
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:506
Constraint on the data type.
Header file for run time assertion macros.
void geqrf(int m, int n, float *A, int lda, float *tau, float *work, int lwork, int *info)
LAPACK kernel for the QR decomposition of the given dense single precision column-major matrix...
Definition: geqrf.h:146
#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:490
BLAZE_ALWAYS_INLINE MT::ElementType * data(DenseMatrix< MT, SO > &dm) noexcept
Low-level data access to the dense matrix elements.
Definition: DenseMatrix.h:169
Header file for the CLAPACK geqrf wrapper functions.
void gelqf(int m, int n, float *A, int lda, float *tau, float *work, int lwork, int *info)
LAPACK kernel for the LQ decomposition of the given dense single precision column-major matrix...
Definition: gelqf.h:146
#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