LAPACK  3.7.1
LAPACK: Linear Algebra PACKage

◆ LAPACKE_zhegv_2stage()

lapack_int LAPACKE_zhegv_2stage ( 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_2stage.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_2stage", -1 );
48  return -1;
49  }
50 #ifndef LAPACK_DISABLE_NAN_CHECK
51  /* Optionally check input matrices for NaNs */
52  if( LAPACKE_zge_nancheck( matrix_layout, n, n, a, lda ) ) {
53  return -6;
54  }
55  if( LAPACKE_zge_nancheck( matrix_layout, n, n, b, ldb ) ) {
56  return -8;
57  }
58 #endif
59  /* Allocate memory for working array(s) */
60  rwork = (double*)LAPACKE_malloc( sizeof(double) * MAX(1,3*n-2) );
61  if( rwork == NULL ) {
63  goto exit_level_0;
64  }
65  /* Query optimal working array(s) size */
66  info = LAPACKE_zhegv_2stage_work( matrix_layout, itype, jobz, uplo, n, a, lda, b,
67  ldb, w, &work_query, lwork, rwork );
68  if( info != 0 ) {
69  goto exit_level_1;
70  }
71  lwork = LAPACK_Z2INT( work_query );
72  /* Allocate memory for work arrays */
73  work = (lapack_complex_double*)
74  LAPACKE_malloc( sizeof(lapack_complex_double) * lwork );
75  if( work == NULL ) {
77  goto exit_level_1;
78  }
79  /* Call middle-level interface */
80  info = LAPACKE_zhegv_2stage_work( matrix_layout, itype, jobz, uplo, n, a, lda, b,
81  ldb, w, work, lwork, rwork );
82  /* Release memory and exit */
83  LAPACKE_free( work );
84 exit_level_1:
85  LAPACKE_free( rwork );
86 exit_level_0:
87  if( info == LAPACK_WORK_MEMORY_ERROR ) {
88  LAPACKE_xerbla( "LAPACKE_zhegv_2stage", info );
89  }
90  return info;
91 }
#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_2stage_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)
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