LAPACK  3.10.1
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 35 of file lapacke_dgelsd.c.

39 {
40  lapack_int info = 0;
41  lapack_int lwork = -1;
42  /* Additional scalars declarations for work arrays */
43  lapack_int liwork;
44  lapack_int* iwork = NULL;
45  double* work = NULL;
46  lapack_int iwork_query;
47  double work_query;
48  if( matrix_layout != LAPACK_COL_MAJOR && matrix_layout != LAPACK_ROW_MAJOR ) {
49  LAPACKE_xerbla( "LAPACKE_dgelsd", -1 );
50  return -1;
51  }
52 #ifndef LAPACK_DISABLE_NAN_CHECK
53  if( LAPACKE_get_nancheck() ) {
54  /* Optionally check input matrices for NaNs */
55  if( LAPACKE_dge_nancheck( matrix_layout, m, n, a, lda ) ) {
56  return -5;
57  }
58  if( LAPACKE_dge_nancheck( matrix_layout, MAX(m,n), nrhs, b, ldb ) ) {
59  return -7;
60  }
61  if( LAPACKE_d_nancheck( 1, &rcond, 1 ) ) {
62  return -10;
63  }
64  }
65 #endif
66  /* Query optimal working array(s) size */
67  info = LAPACKE_dgelsd_work( matrix_layout, m, n, nrhs, a, lda, b, ldb, s,
68  rcond, rank, &work_query, lwork, &iwork_query );
69  if( info != 0 ) {
70  goto exit_level_0;
71  }
72  liwork = iwork_query;
73  lwork = (lapack_int)work_query;
74  /* Allocate memory for work arrays */
75  iwork = (lapack_int*)LAPACKE_malloc( sizeof(lapack_int) * liwork );
76  if( iwork == NULL ) {
78  goto exit_level_0;
79  }
80  work = (double*)LAPACKE_malloc( sizeof(double) * lwork );
81  if( work == NULL ) {
83  goto exit_level_1;
84  }
85  /* Call middle-level interface */
86  info = LAPACKE_dgelsd_work( matrix_layout, m, n, nrhs, a, lda, b, ldb, s,
87  rcond, rank, work, lwork, iwork );
88  /* Release memory and exit */
89  LAPACKE_free( work );
90 exit_level_1:
91  LAPACKE_free( iwork );
92 exit_level_0:
93  if( info == LAPACK_WORK_MEMORY_ERROR ) {
94  LAPACKE_xerbla( "LAPACKE_dgelsd", info );
95  }
96  return info;
97 }
#define lapack_int
Definition: lapack.h:83
#define LAPACK_WORK_MEMORY_ERROR
Definition: lapacke.h:55
#define LAPACK_COL_MAJOR
Definition: lapacke.h:53
#define LAPACKE_free(p)
Definition: lapacke.h:46
#define LAPACK_ROW_MAJOR
Definition: lapacke.h:52
int LAPACKE_get_nancheck(void)
#define LAPACKE_malloc(size)
Definition: lapacke.h:43
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)
void LAPACKE_xerbla(const char *name, lapack_int info)
lapack_logical LAPACKE_d_nancheck(lapack_int n, const double *x, lapack_int incx)
#define MAX(x, y)
Definition: lapacke_utils.h:46
lapack_logical LAPACKE_dge_nancheck(int matrix_layout, lapack_int m, lapack_int n, const double *a, lapack_int lda)
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