LAPACK  3.8.0
LAPACK: Linear Algebra PACKage

◆ LAPACKE_dgelsd()

lapack_int LAPACKE_dgelsd ( int  matrix_layout,
lapack_int  m,
lapack_int  n,
lapack_int  nrhs,
double *  a,
lapack_int  lda,
double *  b,
lapack_int  ldb,
double *  s,
double  rcond,
lapack_int rank 
)

Definition at line 36 of file lapacke_dgelsd.c.

40 {
41  lapack_int info = 0;
42  lapack_int lwork = -1;
43  /* Additional scalars declarations for work arrays */
44  lapack_int liwork;
45  lapack_int* iwork = NULL;
46  double* work = NULL;
47  lapack_int iwork_query;
48  double work_query;
49  if( matrix_layout != LAPACK_COL_MAJOR && matrix_layout != LAPACK_ROW_MAJOR ) {
50  LAPACKE_xerbla( "LAPACKE_dgelsd", -1 );
51  return -1;
52  }
53 #ifndef LAPACK_DISABLE_NAN_CHECK
54  if( LAPACKE_get_nancheck() ) {
55  /* Optionally check input matrices for NaNs */
56  if( LAPACKE_dge_nancheck( matrix_layout, m, n, a, lda ) ) {
57  return -5;
58  }
59  if( LAPACKE_dge_nancheck( matrix_layout, MAX(m,n), nrhs, b, ldb ) ) {
60  return -7;
61  }
62  if( LAPACKE_d_nancheck( 1, &rcond, 1 ) ) {
63  return -10;
64  }
65  }
66 #endif
67  /* Query optimal working array(s) size */
68  info = LAPACKE_dgelsd_work( matrix_layout, m, n, nrhs, a, lda, b, ldb, s,
69  rcond, rank, &work_query, lwork, &iwork_query );
70  if( info != 0 ) {
71  goto exit_level_0;
72  }
73  liwork = (lapack_int)iwork_query;
74  lwork = (lapack_int)work_query;
75  /* Allocate memory for work arrays */
76  iwork = (lapack_int*)LAPACKE_malloc( sizeof(lapack_int) * liwork );
77  if( iwork == NULL ) {
79  goto exit_level_0;
80  }
81  work = (double*)LAPACKE_malloc( sizeof(double) * lwork );
82  if( work == NULL ) {
84  goto exit_level_1;
85  }
86  /* Call middle-level interface */
87  info = LAPACKE_dgelsd_work( matrix_layout, m, n, nrhs, a, lda, b, ldb, s,
88  rcond, rank, work, lwork, iwork );
89  /* Release memory and exit */
90  LAPACKE_free( work );
91 exit_level_1:
92  LAPACKE_free( iwork );
93 exit_level_0:
94  if( info == LAPACK_WORK_MEMORY_ERROR ) {
95  LAPACKE_xerbla( "LAPACKE_dgelsd", info );
96  }
97  return info;
98 }
lapack_int LAPACKE_dgelsd_work(int matrix_layout, lapack_int m, lapack_int n, lapack_int nrhs, double *a, lapack_int lda, double *b, lapack_int ldb, double *s, double rcond, lapack_int *rank, double *work, lapack_int lwork, lapack_int *iwork)
#define LAPACK_ROW_MAJOR
Definition: lapacke.h:119
#define LAPACK_WORK_MEMORY_ERROR
Definition: lapacke.h:122
#define LAPACKE_free(p)
Definition: lapacke.h:113
#define MAX(x, y)
Definition: lapacke_utils.h:47
lapack_logical LAPACKE_dge_nancheck(int matrix_layout, lapack_int m, lapack_int n, const double *a, lapack_int lda)
#define LAPACKE_malloc(size)
Definition: lapacke.h:110
lapack_logical LAPACKE_d_nancheck(lapack_int n, const double *x, lapack_int incx)
#define LAPACK_COL_MAJOR
Definition: lapacke.h:120
void LAPACKE_xerbla(const char *name, lapack_int info)
#define lapack_int
Definition: lapacke.h:47
int LAPACKE_get_nancheck()
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