LAPACK  3.8.0
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 36 of file lapacke_dgesvd.c.

40 {
41  lapack_int info = 0;
42  lapack_int lwork = -1;
43  double* work = NULL;
44  double work_query;
45  lapack_int i;
46  if( matrix_layout != LAPACK_COL_MAJOR && matrix_layout != LAPACK_ROW_MAJOR ) {
47  LAPACKE_xerbla( "LAPACKE_dgesvd", -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 -6;
55  }
56  }
57 #endif
58  /* Query optimal working array(s) size */
59  info = LAPACKE_dgesvd_work( matrix_layout, jobu, jobvt, m, n, a, lda, s, u,
60  ldu, vt, ldvt, &work_query, lwork );
61  if( info != 0 ) {
62  goto exit_level_0;
63  }
64  lwork = (lapack_int)work_query;
65  /* Allocate memory for work arrays */
66  work = (double*)LAPACKE_malloc( sizeof(double) * lwork );
67  if( work == NULL ) {
69  goto exit_level_0;
70  }
71  /* Call middle-level interface */
72  info = LAPACKE_dgesvd_work( matrix_layout, jobu, jobvt, m, n, a, lda, s, u,
73  ldu, vt, ldvt, work, lwork );
74  /* Backup significant data from working array(s) */
75  for( i=0; i<MIN(m,n)-1; i++ ) {
76  superb[i] = work[i+1];
77  }
78  /* Release memory and exit */
79  LAPACKE_free( work );
80 exit_level_0:
81  if( info == LAPACK_WORK_MEMORY_ERROR ) {
82  LAPACKE_xerbla( "LAPACKE_dgesvd", info );
83  }
84  return info;
85 }
#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
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)
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
#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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