LAPACK  3.7.1
LAPACK: Linear Algebra PACKage

◆ LAPACKE_dsygv_work()

lapack_int LAPACKE_dsygv_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 
)

Definition at line 36 of file lapacke_dsygv_work.c.

40 {
41  lapack_int info = 0;
42  if( matrix_layout == LAPACK_COL_MAJOR ) {
43  /* Call LAPACK function and adjust info */
44  LAPACK_dsygv( &itype, &jobz, &uplo, &n, a, &lda, b, &ldb, w, work,
45  &lwork, &info );
46  if( info < 0 ) {
47  info = info - 1;
48  }
49  } else if( matrix_layout == LAPACK_ROW_MAJOR ) {
50  lapack_int lda_t = MAX(1,n);
51  lapack_int ldb_t = MAX(1,n);
52  double* a_t = NULL;
53  double* b_t = NULL;
54  /* Check leading dimension(s) */
55  if( lda < n ) {
56  info = -7;
57  LAPACKE_xerbla( "LAPACKE_dsygv_work", info );
58  return info;
59  }
60  if( ldb < n ) {
61  info = -9;
62  LAPACKE_xerbla( "LAPACKE_dsygv_work", info );
63  return info;
64  }
65  /* Query optimal working array(s) size if requested */
66  if( lwork == -1 ) {
67  LAPACK_dsygv( &itype, &jobz, &uplo, &n, a, &lda_t, b, &ldb_t, w,
68  work, &lwork, &info );
69  return (info < 0) ? (info - 1) : info;
70  }
71  /* Allocate memory for temporary array(s) */
72  a_t = (double*)LAPACKE_malloc( sizeof(double) * lda_t * MAX(1,n) );
73  if( a_t == NULL ) {
75  goto exit_level_0;
76  }
77  b_t = (double*)LAPACKE_malloc( sizeof(double) * ldb_t * MAX(1,n) );
78  if( b_t == NULL ) {
80  goto exit_level_1;
81  }
82  /* Transpose input matrices */
83  LAPACKE_dge_trans( matrix_layout, n, n, a, lda, a_t, lda_t );
84  LAPACKE_dge_trans( matrix_layout, n, n, b, ldb, b_t, ldb_t );
85  /* Call LAPACK function and adjust info */
86  LAPACK_dsygv( &itype, &jobz, &uplo, &n, a_t, &lda_t, b_t, &ldb_t, w,
87  work, &lwork, &info );
88  if( info < 0 ) {
89  info = info - 1;
90  }
91  /* Transpose output matrices */
92  LAPACKE_dge_trans( LAPACK_COL_MAJOR, n, n, a_t, lda_t, a, lda );
93  LAPACKE_dge_trans( LAPACK_COL_MAJOR, n, n, b_t, ldb_t, b, ldb );
94  /* Release memory and exit */
95  LAPACKE_free( b_t );
96 exit_level_1:
97  LAPACKE_free( a_t );
98 exit_level_0:
99  if( info == LAPACK_TRANSPOSE_MEMORY_ERROR ) {
100  LAPACKE_xerbla( "LAPACKE_dsygv_work", info );
101  }
102  } else {
103  info = -1;
104  LAPACKE_xerbla( "LAPACKE_dsygv_work", info );
105  }
106  return info;
107 }
void LAPACKE_dge_trans(int matrix_layout, lapack_int m, lapack_int n, const double *in, lapack_int ldin, double *out, lapack_int ldout)
#define LAPACK_ROW_MAJOR
Definition: lapacke.h:119
#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
#define LAPACK_COL_MAJOR
Definition: lapacke.h:120
void LAPACKE_xerbla(const char *name, lapack_int info)
#define lapack_int
Definition: lapacke.h:47
#define LAPACK_TRANSPOSE_MEMORY_ERROR
Definition: lapacke.h:123
void LAPACK_dsygv(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 *info)
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