LAPACK  3.10.1
LAPACK: Linear Algebra PACKage

◆ LAPACKE_dgesvdx()

lapack_int LAPACKE_dgesvdx ( int  matrix_layout,
char  jobu,
char  jobvt,
char  range,
lapack_int  m,
lapack_int  n,
double *  a,
lapack_int  lda,
double  vl,
double  vu,
lapack_int  il,
lapack_int  iu,
lapack_int ns,
double *  s,
double *  u,
lapack_int  ldu,
double *  vt,
lapack_int  ldvt,
lapack_int superb 
)

Definition at line 35 of file lapacke_dgesvdx.c.

42 {
43  lapack_int info = 0;
44  lapack_int lwork = -1;
45  double* work = NULL;
46  double work_query;
47  lapack_int* iwork = NULL;
48  lapack_int i;
49  if( matrix_layout != LAPACK_COL_MAJOR && matrix_layout != LAPACK_ROW_MAJOR ) {
50  LAPACKE_xerbla( "LAPACKE_dgesvdx", -1 );
51  return -1;
52  }
53 #ifndef LAPACK_DISABLE_NAN_CHECK
54  if( LAPACKE_get_nancheck() ) {
55  /* Optionally check input matrices for NaNs */
56  if( LAPACKE_dge_nancheck( matrix_layout, m, n, a, lda ) ) {
57  return -6;
58  }
59  }
60 #endif
61  /* Query optimal working array(s) size */
62  info = LAPACKE_dgesvdx_work( matrix_layout, jobu, jobvt, range,
63  m, n, a, lda, vl, vu, il, iu, ns, s, u,
64  ldu, vt, ldvt, &work_query, lwork, iwork );
65  if( info != 0 ) {
66  goto exit_level_0;
67  }
68  lwork = (lapack_int)work_query;
69  /* Allocate memory for work arrays */
70  work = (double*)LAPACKE_malloc( sizeof(double) * lwork );
71  if( work == NULL ) {
73  goto exit_level_0;
74  }
75  iwork = (lapack_int*)LAPACKE_malloc( sizeof(lapack_int) * MAX(1,(12*MIN(m,n))) );
76  if( iwork == NULL ) {
78  goto exit_level_1;
79  }
80  /* Call middle-level interface */
81  info = LAPACKE_dgesvdx_work( matrix_layout, jobu, jobvt, range,
82  m, n, a, lda, vl, vu, il, iu, ns, s, u,
83  ldu, vt, ldvt, work, lwork, iwork );
84  /* Backup significant data from working array(s) */
85  for( i=0; i<12*MIN(m,n)-1; i++ ) {
86  superb[i] = iwork[i+1];
87  }
88  /* Release memory and exit */
89  LAPACKE_free( iwork );
90 exit_level_1:
91  LAPACKE_free( work );
92 exit_level_0:
93  if( info == LAPACK_WORK_MEMORY_ERROR ) {
94  LAPACKE_xerbla( "LAPACKE_dgesvdx", info );
95  }
96  return info;
97 }
#define lapack_int
Definition: lapack.h:83
#define LAPACK_WORK_MEMORY_ERROR
Definition: lapacke.h:55
#define LAPACK_COL_MAJOR
Definition: lapacke.h:53
#define LAPACKE_free(p)
Definition: lapacke.h:46
#define LAPACK_ROW_MAJOR
Definition: lapacke.h:52
int LAPACKE_get_nancheck(void)
lapack_int LAPACKE_dgesvdx_work(int matrix_layout, char jobu, char jobvt, char range, lapack_int m, lapack_int n, double *a, lapack_int lda, double vl, double vu, lapack_int il, lapack_int iu, lapack_int *ns, double *s, double *u, lapack_int ldu, double *vt, lapack_int ldvt, double *work, lapack_int lwork, lapack_int *iwork)
#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
#define MAX(x, y)
Definition: lapacke_utils.h:46
lapack_logical LAPACKE_dge_nancheck(int matrix_layout, lapack_int m, lapack_int n, const double *a, lapack_int lda)
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