LAPACK  3.8.0
LAPACK: Linear Algebra PACKage

◆ LAPACKE_zstegr()

lapack_int LAPACKE_zstegr ( int  matrix_layout,
char  jobz,
char  range,
lapack_int  n,
double *  d,
double *  e,
double  vl,
double  vu,
lapack_int  il,
lapack_int  iu,
double  abstol,
lapack_int m,
double *  w,
lapack_complex_double z,
lapack_int  ldz,
lapack_int isuppz 
)

Definition at line 36 of file lapacke_zstegr.c.

42 {
43  lapack_int info = 0;
44  lapack_int liwork = -1;
45  lapack_int lwork = -1;
46  lapack_int* iwork = NULL;
47  double* work = NULL;
48  lapack_int iwork_query;
49  double work_query;
50  if( matrix_layout != LAPACK_COL_MAJOR && matrix_layout != LAPACK_ROW_MAJOR ) {
51  LAPACKE_xerbla( "LAPACKE_zstegr", -1 );
52  return -1;
53  }
54 #ifndef LAPACK_DISABLE_NAN_CHECK
55  if( LAPACKE_get_nancheck() ) {
56  /* Optionally check input matrices for NaNs */
57  if( LAPACKE_d_nancheck( 1, &abstol, 1 ) ) {
58  return -11;
59  }
60  if( LAPACKE_d_nancheck( n, d, 1 ) ) {
61  return -5;
62  }
63  if( LAPACKE_d_nancheck( n-1, e, 1 ) ) {
64  return -6;
65  }
66  if( LAPACKE_lsame( range, 'v' ) ) {
67  if( LAPACKE_d_nancheck( 1, &vl, 1 ) ) {
68  return -7;
69  }
70  }
71  if( LAPACKE_lsame( range, 'v' ) ) {
72  if( LAPACKE_d_nancheck( 1, &vu, 1 ) ) {
73  return -8;
74  }
75  }
76  }
77 #endif
78  /* Query optimal working array(s) size */
79  info = LAPACKE_zstegr_work( matrix_layout, jobz, range, n, d, e, vl, vu, il,
80  iu, abstol, m, w, z, ldz, isuppz, &work_query,
81  lwork, &iwork_query, liwork );
82  if( info != 0 ) {
83  goto exit_level_0;
84  }
85  liwork = (lapack_int)iwork_query;
86  lwork = (lapack_int)work_query;
87  /* Allocate memory for work arrays */
88  iwork = (lapack_int*)LAPACKE_malloc( sizeof(lapack_int) * liwork );
89  if( iwork == NULL ) {
91  goto exit_level_0;
92  }
93  work = (double*)LAPACKE_malloc( sizeof(double) * lwork );
94  if( work == NULL ) {
96  goto exit_level_1;
97  }
98  /* Call middle-level interface */
99  info = LAPACKE_zstegr_work( matrix_layout, jobz, range, n, d, e, vl, vu, il,
100  iu, abstol, m, w, z, ldz, isuppz, work, lwork,
101  iwork, liwork );
102  /* Release memory and exit */
103  LAPACKE_free( work );
104 exit_level_1:
105  LAPACKE_free( iwork );
106 exit_level_0:
107  if( info == LAPACK_WORK_MEMORY_ERROR ) {
108  LAPACKE_xerbla( "LAPACKE_zstegr", info );
109  }
110  return info;
111 }
#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_int LAPACKE_zstegr_work(int matrix_layout, char jobz, char range, lapack_int n, double *d, double *e, double vl, double vu, lapack_int il, lapack_int iu, double abstol, lapack_int *m, double *w, lapack_complex_double *z, lapack_int ldz, lapack_int *isuppz, double *work, lapack_int lwork, lapack_int *iwork, lapack_int liwork)
#define LAPACKE_malloc(size)
Definition: lapacke.h:110
lapack_logical LAPACKE_d_nancheck(lapack_int n, const double *x, lapack_int incx)
lapack_logical LAPACKE_lsame(char ca, char cb)
Definition: lapacke_lsame.c:36
#define LAPACK_COL_MAJOR
Definition: lapacke.h:120
void LAPACKE_xerbla(const char *name, lapack_int info)
#define lapack_int
Definition: lapacke.h:47
int LAPACKE_get_nancheck()
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