LAPACK  3.8.0
LAPACK: Linear Algebra PACKage

◆ LAPACKE_dbdsdc()

lapack_int LAPACKE_dbdsdc ( int  matrix_layout,
char  uplo,
char  compq,
lapack_int  n,
double *  d,
double *  e,
double *  u,
lapack_int  ldu,
double *  vt,
lapack_int  ldvt,
double *  q,
lapack_int iq 
)

Definition at line 36 of file lapacke_dbdsdc.c.

40 {
41  lapack_int info = 0;
42  /* Additional scalars declarations for work arrays */
43  size_t lwork;
44  lapack_int* iwork = NULL;
45  double* work = NULL;
46  if( matrix_layout != LAPACK_COL_MAJOR && matrix_layout != LAPACK_ROW_MAJOR ) {
47  LAPACKE_xerbla( "LAPACKE_dbdsdc", -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_d_nancheck( n, d, 1 ) ) {
54  return -5;
55  }
56  if( LAPACKE_d_nancheck( n-1, e, 1 ) ) {
57  return -6;
58  }
59  }
60 #endif
61  /* Additional scalars initializations for work arrays */
62  if( LAPACKE_lsame( compq, 'i' ) ) {
63  lwork = (size_t)3*MAX(1,n)*MAX(1,n)+4*MAX(1,n);
64  } else if( LAPACKE_lsame( compq, 'p' ) ) {
65  lwork = MAX(1,6*n);
66  } else if( LAPACKE_lsame( compq, 'n' ) ) {
67  lwork = MAX(1,4*n);
68  } else {
69  lwork = 1; /* Any value */
70  }
71  /* Allocate memory for working array(s) */
72  iwork = (lapack_int*)LAPACKE_malloc( sizeof(lapack_int) * MAX(1,8*n) );
73  if( iwork == NULL ) {
75  goto exit_level_0;
76  }
77  work = (double*)LAPACKE_malloc( sizeof(double) * lwork );
78  if( work == NULL ) {
80  goto exit_level_1;
81  }
82  /* Call middle-level interface */
83  info = LAPACKE_dbdsdc_work( matrix_layout, uplo, compq, n, d, e, u, ldu, vt,
84  ldvt, q, iq, work, iwork );
85  /* Release memory and exit */
86  LAPACKE_free( work );
87 exit_level_1:
88  LAPACKE_free( iwork );
89 exit_level_0:
90  if( info == LAPACK_WORK_MEMORY_ERROR ) {
91  LAPACKE_xerbla( "LAPACKE_dbdsdc", info );
92  }
93  return info;
94 }
lapack_int LAPACKE_dbdsdc_work(int matrix_layout, char uplo, char compq, lapack_int n, double *d, double *e, double *u, lapack_int ldu, double *vt, lapack_int ldvt, double *q, lapack_int *iq, double *work, lapack_int *iwork)
#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 MAX(x, y)
Definition: lapacke_utils.h:47
#define LAPACKE_malloc(size)
Definition: lapacke.h:110
lapack_logical LAPACKE_d_nancheck(lapack_int n, const double *x, lapack_int incx)
lapack_logical LAPACKE_lsame(char ca, char cb)
Definition: lapacke_lsame.c:36
#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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