Blaze  3.6
gelqf.h
Go to the documentation of this file.
1 //=================================================================================================
33 //=================================================================================================
34 
35 #ifndef _BLAZE_MATH_LAPACK_GELQF_H_
36 #define _BLAZE_MATH_LAPACK_GELQF_H_
37 
38 
39 //*************************************************************************************************
40 // Includes
41 //*************************************************************************************************
42 
43 #include <memory>
44 #include <blaze/math/Aliases.h>
53 #include <blaze/util/Assert.h>
54 #include <blaze/util/NumericCast.h>
55 
56 
57 namespace blaze {
58 
59 //=================================================================================================
60 //
61 // LAPACK LQ DECOMPOSITION FUNCTIONS (GELQF)
62 //
63 //=================================================================================================
64 
65 //*************************************************************************************************
68 template< typename MT, bool SO >
69 void gelqf( DenseMatrix<MT,SO>& A, ElementType_t<MT>* tau );
71 //*************************************************************************************************
72 
73 
74 //*************************************************************************************************
116 template< typename MT // Type of the dense matrix
117  , bool SO > // Storage order of the dense matrix
119 {
125 
126  using ET = ElementType_t<MT>;
127 
128  int m ( numeric_cast<int>( SO ? (~A).rows() : (~A).columns() ) );
129  int n ( numeric_cast<int>( SO ? (~A).columns() : (~A).rows() ) );
130  int lda ( numeric_cast<int>( (~A).spacing() ) );
131  int info( 0 );
132 
133  if( m == 0 || n == 0 ) {
134  return;
135  }
136 
137  int lwork( ( SO ? m : n ) * lda );
138  const std::unique_ptr<ET[]> work( new ET[lwork] );
139 
140  if( SO ) {
141  gelqf( m, n, (~A).data(), lda, tau, work.get(), lwork, &info );
142  }
143  else {
144  geqrf( m, n, (~A).data(), lda, tau, work.get(), lwork, &info );
145  }
146 
147  BLAZE_INTERNAL_ASSERT( info == 0, "Invalid argument for LQ decomposition" );
148 }
149 //*************************************************************************************************
150 
151 } // namespace blaze
152 
153 #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
MT::ElementType * data(DenseMatrix< MT, SO > &dm) noexcept
Low-level data access to the dense matrix elements.
Definition: DenseMatrix.h:170
#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.
Constraint on the data type.
Cast operators for numeric types.
constexpr size_t columns(const Matrix< MT, SO > &matrix) noexcept
Returns the current number of columns of the matrix.
Definition: Matrix.h:514
#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:81
typename T::ElementType ElementType_t
Alias declaration for nested ElementType type definitions.The ElementType_t alias declaration provide...
Definition: Aliases.h:170
Header file for the CLAPACK gelqf wrapper functions.
size_t spacing(const DenseMatrix< MT, SO > &dm) noexcept
Returns the spacing between the beginning of two rows/columns.
Definition: DenseMatrix.h:253
Constraint on the data type.
Namespace of the Blaze C++ math library.
Definition: Blaze.h:58
#define BLAZE_CONSTRAINT_MUST_BE_CONTIGUOUS_TYPE(T)
Constraint on the data type.In case the given data type T is not an array-like data type with contigu...
Definition: Contiguous.h:61
Header file for the DenseMatrix base class.
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
constexpr size_t rows(const Matrix< MT, SO > &matrix) noexcept
Returns the current number of rows of the matrix.
Definition: Matrix.h:498
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,...
Definition: Assert.h:101