LAPACK  3.8.0
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 36 of file lapacke_dgesvdx.c.

43 {
44  lapack_int info = 0;
45  lapack_int lwork = -1;
46  double* work = NULL;
47  double work_query;
48  lapack_int* iwork = NULL;
49  lapack_int i;
50  if( matrix_layout != LAPACK_COL_MAJOR && matrix_layout != LAPACK_ROW_MAJOR ) {
51  LAPACKE_xerbla( "LAPACKE_dgesvdx", -1 );
52  return -1;
53  }
54 #ifndef LAPACK_DISABLE_NAN_CHECK
55  if( LAPACKE_get_nancheck() ) {
56  /* Optionally check input matrices for NaNs */
57  if( LAPACKE_dge_nancheck( matrix_layout, m, n, a, lda ) ) {
58  return -6;
59  }
60  }
61 #endif
62  /* Query optimal working array(s) size */
63  info = LAPACKE_dgesvdx_work( matrix_layout, jobu, jobvt, range,
64  m, n, a, lda, vl, vu, il, iu, ns, s, u,
65  ldu, vt, ldvt, &work_query, lwork, iwork );
66  if( info != 0 ) {
67  goto exit_level_0;
68  }
69  lwork = (lapack_int)work_query;
70  /* Allocate memory for work arrays */
71  work = (double*)LAPACKE_malloc( sizeof(double) * lwork );
72  if( work == NULL ) {
74  goto exit_level_0;
75  }
76  iwork = (lapack_int*)LAPACKE_malloc( sizeof(lapack_int) * MAX(1,(12*MIN(m,n))) );
77  if( iwork == NULL ) {
79  goto exit_level_1;
80  }
81  /* Call middle-level interface */
82  info = LAPACKE_dgesvdx_work( matrix_layout, jobu, jobvt, range,
83  m, n, a, lda, vl, vu, il, iu, ns, s, u,
84  ldu, vt, ldvt, work, lwork, iwork );
85  /* Backup significant data from working array(s) */
86  for( i=0; i<12*MIN(m,n)-1; i++ ) {
87  superb[i] = iwork[i+1];
88  }
89  /* Release memory and exit */
90  LAPACKE_free( iwork );
91 exit_level_1:
92  LAPACKE_free( work );
93 exit_level_0:
94  if( info == LAPACK_WORK_MEMORY_ERROR ) {
95  LAPACKE_xerbla( "LAPACKE_dgesvdx", info );
96  }
97  return info;
98 }
#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_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 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
#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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