LAPACK  3.10.1
LAPACK: Linear Algebra PACKage

◆ LAPACKE_dgesvd()

lapack_int LAPACKE_dgesvd ( int  matrix_layout,
char  jobu,
char  jobvt,
lapack_int  m,
lapack_int  n,
double *  a,
lapack_int  lda,
double *  s,
double *  u,
lapack_int  ldu,
double *  vt,
lapack_int  ldvt,
double *  superb 
)

Definition at line 35 of file lapacke_dgesvd.c.

39 {
40  lapack_int info = 0;
41  lapack_int lwork = -1;
42  double* work = NULL;
43  double work_query;
44  lapack_int i;
45  if( matrix_layout != LAPACK_COL_MAJOR && matrix_layout != LAPACK_ROW_MAJOR ) {
46  LAPACKE_xerbla( "LAPACKE_dgesvd", -1 );
47  return -1;
48  }
49 #ifndef LAPACK_DISABLE_NAN_CHECK
50  if( LAPACKE_get_nancheck() ) {
51  /* Optionally check input matrices for NaNs */
52  if( LAPACKE_dge_nancheck( matrix_layout, m, n, a, lda ) ) {
53  return -6;
54  }
55  }
56 #endif
57  /* Query optimal working array(s) size */
58  info = LAPACKE_dgesvd_work( matrix_layout, jobu, jobvt, m, n, a, lda, s, u,
59  ldu, vt, ldvt, &work_query, lwork );
60  if( info != 0 ) {
61  goto exit_level_0;
62  }
63  lwork = (lapack_int)work_query;
64  /* Allocate memory for work arrays */
65  work = (double*)LAPACKE_malloc( sizeof(double) * lwork );
66  if( work == NULL ) {
68  goto exit_level_0;
69  }
70  /* Call middle-level interface */
71  info = LAPACKE_dgesvd_work( matrix_layout, jobu, jobvt, m, n, a, lda, s, u,
72  ldu, vt, ldvt, work, lwork );
73  /* Backup significant data from working array(s) */
74  for( i=0; i<MIN(m,n)-1; i++ ) {
75  superb[i] = work[i+1];
76  }
77  /* Release memory and exit */
78  LAPACKE_free( work );
79 exit_level_0:
80  if( info == LAPACK_WORK_MEMORY_ERROR ) {
81  LAPACKE_xerbla( "LAPACKE_dgesvd", info );
82  }
83  return info;
84 }
#define lapack_int
Definition: lapack.h:83
#define LAPACK_WORK_MEMORY_ERROR
Definition: lapacke.h:55
#define LAPACK_COL_MAJOR
Definition: lapacke.h:53
lapack_int LAPACKE_dgesvd_work(int matrix_layout, char jobu, char jobvt, 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)
#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
void LAPACKE_xerbla(const char *name, lapack_int info)
#define MIN(x, y)
Definition: lapacke_utils.h:49
lapack_logical LAPACKE_dge_nancheck(int matrix_layout, lapack_int m, lapack_int n, const double *a, lapack_int lda)
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