LAPACK  3.8.0
LAPACK: Linear Algebra PACKage

◆ LAPACKE_dgesdd()

lapack_int LAPACKE_dgesdd ( int  matrix_layout,
char  jobz,
lapack_int  m,
lapack_int  n,
double *  a,
lapack_int  lda,
double *  s,
double *  u,
lapack_int  ldu,
double *  vt,
lapack_int  ldvt 
)

Definition at line 36 of file lapacke_dgesdd.c.

40 {
41  lapack_int info = 0;
42  lapack_int lwork = -1;
43  lapack_int* iwork = NULL;
44  double* work = NULL;
45  double work_query;
46  if( matrix_layout != LAPACK_COL_MAJOR && matrix_layout != LAPACK_ROW_MAJOR ) {
47  LAPACKE_xerbla( "LAPACKE_dgesdd", -1 );
48  return -1;
49  }
50 #ifndef LAPACK_DISABLE_NAN_CHECK
51  if( LAPACKE_get_nancheck() ) {
52  /* Optionally check input matrices for NaNs */
53  if( LAPACKE_dge_nancheck( matrix_layout, m, n, a, lda ) ) {
54  return -5;
55  }
56  }
57 #endif
58  /* Allocate memory for working array(s) */
59  iwork = (lapack_int*)
60  LAPACKE_malloc( sizeof(lapack_int) * MAX(1,8*MIN(m,n)) );
61  if( iwork == NULL ) {
63  goto exit_level_0;
64  }
65  /* Query optimal working array(s) size */
66  info = LAPACKE_dgesdd_work( matrix_layout, jobz, m, n, a, lda, s, u, ldu, vt,
67  ldvt, &work_query, lwork, iwork );
68  if( info != 0 ) {
69  goto exit_level_1;
70  }
71  lwork = (lapack_int)work_query;
72  /* Allocate memory for work arrays */
73  work = (double*)LAPACKE_malloc( sizeof(double) * lwork );
74  if( work == NULL ) {
76  goto exit_level_1;
77  }
78  /* Call middle-level interface */
79  info = LAPACKE_dgesdd_work( matrix_layout, jobz, m, n, a, lda, s, u, ldu, vt,
80  ldvt, work, lwork, iwork );
81  /* Release memory and exit */
82  LAPACKE_free( work );
83 exit_level_1:
84  LAPACKE_free( iwork );
85 exit_level_0:
86  if( info == LAPACK_WORK_MEMORY_ERROR ) {
87  LAPACKE_xerbla( "LAPACKE_dgesdd", info );
88  }
89  return info;
90 }
#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 MIN(x, y)
Definition: lapacke_utils.h:50
#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_int LAPACKE_dgesdd_work(int matrix_layout, char jobz, lapack_int m, lapack_int n, double *a, lapack_int lda, double *s, double *u, lapack_int ldu, double *vt, lapack_int ldvt, double *work, lapack_int lwork, lapack_int *iwork)
#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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