LAPACK  3.8.0
LAPACK: Linear Algebra PACKage

◆ LAPACKE_zhegv()

lapack_int LAPACKE_zhegv ( 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 
)

Definition at line 36 of file lapacke_zhegv.c.

40 {
41  lapack_int info = 0;
42  lapack_int lwork = -1;
43  double* rwork = NULL;
44  lapack_complex_double* work = NULL;
45  lapack_complex_double work_query;
46  if( matrix_layout != LAPACK_COL_MAJOR && matrix_layout != LAPACK_ROW_MAJOR ) {
47  LAPACKE_xerbla( "LAPACKE_zhegv", -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_zge_nancheck( matrix_layout, n, n, a, lda ) ) {
54  return -6;
55  }
56  if( LAPACKE_zge_nancheck( matrix_layout, n, n, b, ldb ) ) {
57  return -8;
58  }
59  }
60 #endif
61  /* Allocate memory for working array(s) */
62  rwork = (double*)LAPACKE_malloc( sizeof(double) * MAX(1,3*n-2) );
63  if( rwork == NULL ) {
65  goto exit_level_0;
66  }
67  /* Query optimal working array(s) size */
68  info = LAPACKE_zhegv_work( matrix_layout, itype, jobz, uplo, n, a, lda, b,
69  ldb, w, &work_query, lwork, rwork );
70  if( info != 0 ) {
71  goto exit_level_1;
72  }
73  lwork = LAPACK_Z2INT( work_query );
74  /* Allocate memory for work arrays */
75  work = (lapack_complex_double*)
76  LAPACKE_malloc( sizeof(lapack_complex_double) * lwork );
77  if( work == NULL ) {
79  goto exit_level_1;
80  }
81  /* Call middle-level interface */
82  info = LAPACKE_zhegv_work( matrix_layout, itype, jobz, uplo, n, a, lda, b,
83  ldb, w, work, lwork, rwork );
84  /* Release memory and exit */
85  LAPACKE_free( work );
86 exit_level_1:
87  LAPACKE_free( rwork );
88 exit_level_0:
89  if( info == LAPACK_WORK_MEMORY_ERROR ) {
90  LAPACKE_xerbla( "LAPACKE_zhegv", info );
91  }
92  return info;
93 }
#define LAPACK_Z2INT(x)
Definition: lapacke.h:117
#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 lapack_complex_double
Definition: lapacke.h:90
#define MAX(x, y)
Definition: lapacke_utils.h:47
#define LAPACKE_malloc(size)
Definition: lapacke.h:110
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)
#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_logical LAPACKE_zge_nancheck(int matrix_layout, lapack_int m, lapack_int n, const lapack_complex_double *a, lapack_int lda)
int LAPACKE_get_nancheck()
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