LAPACK  3.8.0
LAPACK: Linear Algebra PACKage

◆ LAPACKE_dsygvd()

lapack_int LAPACKE_dsygvd ( int  matrix_layout,
lapack_int  itype,
char  jobz,
char  uplo,
lapack_int  n,
double *  a,
lapack_int  lda,
double *  b,
lapack_int  ldb,
double *  w 
)

Definition at line 36 of file lapacke_dsygvd.c.

39 {
40  lapack_int info = 0;
41  lapack_int liwork = -1;
42  lapack_int lwork = -1;
43  lapack_int* iwork = NULL;
44  double* work = NULL;
45  lapack_int iwork_query;
46  double work_query;
47  if( matrix_layout != LAPACK_COL_MAJOR && matrix_layout != LAPACK_ROW_MAJOR ) {
48  LAPACKE_xerbla( "LAPACKE_dsygvd", -1 );
49  return -1;
50  }
51 #ifndef LAPACK_DISABLE_NAN_CHECK
52  if( LAPACKE_get_nancheck() ) {
53  /* Optionally check input matrices for NaNs */
54  if( LAPACKE_dge_nancheck( matrix_layout, n, n, a, lda ) ) {
55  return -6;
56  }
57  if( LAPACKE_dge_nancheck( matrix_layout, n, n, b, ldb ) ) {
58  return -8;
59  }
60  }
61 #endif
62  /* Query optimal working array(s) size */
63  info = LAPACKE_dsygvd_work( matrix_layout, itype, jobz, uplo, n, a, lda, b,
64  ldb, w, &work_query, lwork, &iwork_query,
65  liwork );
66  if( info != 0 ) {
67  goto exit_level_0;
68  }
69  liwork = (lapack_int)iwork_query;
70  lwork = (lapack_int)work_query;
71  /* Allocate memory for work arrays */
72  iwork = (lapack_int*)LAPACKE_malloc( sizeof(lapack_int) * liwork );
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_dsygvd_work( matrix_layout, itype, jobz, uplo, n, a, lda, b,
84  ldb, w, work, lwork, iwork, liwork );
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_dsygvd", info );
92  }
93  return info;
94 }
#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_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
lapack_int LAPACKE_dsygvd_work(int matrix_layout, lapack_int itype, char jobz, char uplo, lapack_int n, double *a, lapack_int lda, double *b, lapack_int ldb, double *w, double *work, lapack_int lwork, lapack_int *iwork, lapack_int liwork)
int LAPACKE_get_nancheck()
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