LAPACK  3.7.1
LAPACK: Linear Algebra PACKage

◆ LAPACKE_sgesvd()

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

Definition at line 36 of file lapacke_sgesvd.c.

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