LAPACK  3.7.1
LAPACK: Linear Algebra PACKage

◆ LAPACKE_dgelsd_work()

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 
)

Definition at line 36 of file lapacke_dgelsd_work.c.

41 {
42  lapack_int info = 0;
43  if( matrix_layout == LAPACK_COL_MAJOR ) {
44  /* Call LAPACK function and adjust info */
45  LAPACK_dgelsd( &m, &n, &nrhs, a, &lda, b, &ldb, s, &rcond, rank, work,
46  &lwork, iwork, &info );
47  if( info < 0 ) {
48  info = info - 1;
49  }
50  } else if( matrix_layout == LAPACK_ROW_MAJOR ) {
51  lapack_int lda_t = MAX(1,m);
52  lapack_int ldb_t = MAX(1,MAX(m,n));
53  double* a_t = NULL;
54  double* b_t = NULL;
55  /* Check leading dimension(s) */
56  if( lda < n ) {
57  info = -6;
58  LAPACKE_xerbla( "LAPACKE_dgelsd_work", info );
59  return info;
60  }
61  if( ldb < nrhs ) {
62  info = -8;
63  LAPACKE_xerbla( "LAPACKE_dgelsd_work", info );
64  return info;
65  }
66  /* Query optimal working array(s) size if requested */
67  if( lwork == -1 ) {
68  LAPACK_dgelsd( &m, &n, &nrhs, a, &lda_t, b, &ldb_t, s, &rcond, rank,
69  work, &lwork, iwork, &info );
70  return (info < 0) ? (info - 1) : info;
71  }
72  /* Allocate memory for temporary array(s) */
73  a_t = (double*)LAPACKE_malloc( sizeof(double) * lda_t * MAX(1,n) );
74  if( a_t == NULL ) {
76  goto exit_level_0;
77  }
78  b_t = (double*)LAPACKE_malloc( sizeof(double) * ldb_t * MAX(1,nrhs) );
79  if( b_t == NULL ) {
81  goto exit_level_1;
82  }
83  /* Transpose input matrices */
84  LAPACKE_dge_trans( matrix_layout, m, n, a, lda, a_t, lda_t );
85  LAPACKE_dge_trans( matrix_layout, MAX(m,n), nrhs, b, ldb, b_t, ldb_t );
86  /* Call LAPACK function and adjust info */
87  LAPACK_dgelsd( &m, &n, &nrhs, a_t, &lda_t, b_t, &ldb_t, s, &rcond, rank,
88  work, &lwork, iwork, &info );
89  if( info < 0 ) {
90  info = info - 1;
91  }
92  /* Transpose output matrices */
93  LAPACKE_dge_trans( LAPACK_COL_MAJOR, m, n, a_t, lda_t, a, lda );
94  LAPACKE_dge_trans( LAPACK_COL_MAJOR, MAX(m,n), nrhs, b_t, ldb_t, b,
95  ldb );
96  /* Release memory and exit */
97  LAPACKE_free( b_t );
98 exit_level_1:
99  LAPACKE_free( a_t );
100 exit_level_0:
101  if( info == LAPACK_TRANSPOSE_MEMORY_ERROR ) {
102  LAPACKE_xerbla( "LAPACKE_dgelsd_work", info );
103  }
104  } else {
105  info = -1;
106  LAPACKE_xerbla( "LAPACKE_dgelsd_work", info );
107  }
108  return info;
109 }
void LAPACKE_dge_trans(int matrix_layout, lapack_int m, lapack_int n, const double *in, lapack_int ldin, double *out, lapack_int ldout)
#define LAPACK_ROW_MAJOR
Definition: lapacke.h:119
#define LAPACKE_free(p)
Definition: lapacke.h:113
#define MAX(x, y)
Definition: lapacke_utils.h:47
#define LAPACKE_malloc(size)
Definition: lapacke.h:110
#define LAPACK_COL_MAJOR
Definition: lapacke.h:120
void LAPACKE_xerbla(const char *name, lapack_int info)
#define lapack_int
Definition: lapacke.h:47
void LAPACK_dgelsd(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, lapack_int *info)
#define LAPACK_TRANSPOSE_MEMORY_ERROR
Definition: lapacke.h:123
Here is the call graph for this function:
Here is the caller graph for this function: