LAPACK  3.8.0
LAPACK: Linear Algebra PACKage

◆ LAPACKE_zhegv_work()

lapack_int LAPACKE_zhegv_work ( int  matrix_layout,
lapack_int  itype,
char  jobz,
char  uplo,
lapack_int  n,
lapack_complex_double a,
lapack_int  lda,
lapack_complex_double b,
lapack_int  ldb,
double *  w,
lapack_complex_double work,
lapack_int  lwork,
double *  rwork 
)

Definition at line 36 of file lapacke_zhegv_work.c.

42 {
43  lapack_int info = 0;
44  if( matrix_layout == LAPACK_COL_MAJOR ) {
45  /* Call LAPACK function and adjust info */
46  LAPACK_zhegv( &itype, &jobz, &uplo, &n, a, &lda, b, &ldb, w, work,
47  &lwork, rwork, &info );
48  if( info < 0 ) {
49  info = info - 1;
50  }
51  } else if( matrix_layout == LAPACK_ROW_MAJOR ) {
52  lapack_int lda_t = MAX(1,n);
53  lapack_int ldb_t = MAX(1,n);
54  lapack_complex_double* a_t = NULL;
55  lapack_complex_double* b_t = NULL;
56  /* Check leading dimension(s) */
57  if( lda < n ) {
58  info = -7;
59  LAPACKE_xerbla( "LAPACKE_zhegv_work", info );
60  return info;
61  }
62  if( ldb < n ) {
63  info = -9;
64  LAPACKE_xerbla( "LAPACKE_zhegv_work", info );
65  return info;
66  }
67  /* Query optimal working array(s) size if requested */
68  if( lwork == -1 ) {
69  LAPACK_zhegv( &itype, &jobz, &uplo, &n, a, &lda_t, b, &ldb_t, w,
70  work, &lwork, rwork, &info );
71  return (info < 0) ? (info - 1) : info;
72  }
73  /* Allocate memory for temporary array(s) */
74  a_t = (lapack_complex_double*)
75  LAPACKE_malloc( sizeof(lapack_complex_double) * lda_t * MAX(1,n) );
76  if( a_t == NULL ) {
78  goto exit_level_0;
79  }
80  b_t = (lapack_complex_double*)
81  LAPACKE_malloc( sizeof(lapack_complex_double) * ldb_t * MAX(1,n) );
82  if( b_t == NULL ) {
84  goto exit_level_1;
85  }
86  /* Transpose input matrices */
87  LAPACKE_zge_trans( matrix_layout, n, n, a, lda, a_t, lda_t );
88  LAPACKE_zge_trans( matrix_layout, n, n, b, ldb, b_t, ldb_t );
89  /* Call LAPACK function and adjust info */
90  LAPACK_zhegv( &itype, &jobz, &uplo, &n, a_t, &lda_t, b_t, &ldb_t, w,
91  work, &lwork, rwork, &info );
92  if( info < 0 ) {
93  info = info - 1;
94  }
95  /* Transpose output matrices */
96  LAPACKE_zge_trans( LAPACK_COL_MAJOR, n, n, a_t, lda_t, a, lda );
97  LAPACKE_zge_trans( LAPACK_COL_MAJOR, n, n, b_t, ldb_t, b, ldb );
98  /* Release memory and exit */
99  LAPACKE_free( b_t );
100 exit_level_1:
101  LAPACKE_free( a_t );
102 exit_level_0:
103  if( info == LAPACK_TRANSPOSE_MEMORY_ERROR ) {
104  LAPACKE_xerbla( "LAPACKE_zhegv_work", info );
105  }
106  } else {
107  info = -1;
108  LAPACKE_xerbla( "LAPACKE_zhegv_work", info );
109  }
110  return info;
111 }
#define LAPACK_ROW_MAJOR
Definition: lapacke.h:119
#define LAPACKE_free(p)
Definition: lapacke.h:113
#define lapack_complex_double
Definition: lapacke.h:90
#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_zhegv(lapack_int *itype, char *jobz, char *uplo, lapack_int *n, lapack_complex_double *a, lapack_int *lda, lapack_complex_double *b, lapack_int *ldb, double *w, lapack_complex_double *work, lapack_int *lwork, double *rwork, lapack_int *info)
void LAPACKE_zge_trans(int matrix_layout, lapack_int m, lapack_int n, const lapack_complex_double *in, lapack_int ldin, lapack_complex_double *out, lapack_int ldout)
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