LAPACK  3.7.1
LAPACK: Linear Algebra PACKage

◆ LAPACKE_dstegr()

lapack_int LAPACKE_dstegr ( 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,
double *  z,
lapack_int  ldz,
lapack_int isuppz 
)

Definition at line 36 of file lapacke_dstegr.c.

41 {
42  lapack_int info = 0;
43  lapack_int liwork = -1;
44  lapack_int lwork = -1;
45  lapack_int* iwork = NULL;
46  double* work = NULL;
47  lapack_int iwork_query;
48  double work_query;
49  if( matrix_layout != LAPACK_COL_MAJOR && matrix_layout != LAPACK_ROW_MAJOR ) {
50  LAPACKE_xerbla( "LAPACKE_dstegr", -1 );
51  return -1;
52  }
53 #ifndef LAPACK_DISABLE_NAN_CHECK
54  /* Optionally check input matrices for NaNs */
55  if( LAPACKE_d_nancheck( 1, &abstol, 1 ) ) {
56  return -11;
57  }
58  if( LAPACKE_d_nancheck( n, d, 1 ) ) {
59  return -5;
60  }
61  if( LAPACKE_d_nancheck( n-1, e, 1 ) ) {
62  return -6;
63  }
64  if( LAPACKE_lsame( range, 'v' ) ) {
65  if( LAPACKE_d_nancheck( 1, &vl, 1 ) ) {
66  return -7;
67  }
68  }
69  if( LAPACKE_lsame( range, 'v' ) ) {
70  if( LAPACKE_d_nancheck( 1, &vu, 1 ) ) {
71  return -8;
72  }
73  }
74 #endif
75  /* Query optimal working array(s) size */
76  info = LAPACKE_dstegr_work( matrix_layout, jobz, range, n, d, e, vl, vu, il,
77  iu, abstol, m, w, z, ldz, isuppz, &work_query,
78  lwork, &iwork_query, liwork );
79  if( info != 0 ) {
80  goto exit_level_0;
81  }
82  liwork = (lapack_int)iwork_query;
83  lwork = (lapack_int)work_query;
84  /* Allocate memory for work arrays */
85  iwork = (lapack_int*)LAPACKE_malloc( sizeof(lapack_int) * liwork );
86  if( iwork == NULL ) {
88  goto exit_level_0;
89  }
90  work = (double*)LAPACKE_malloc( sizeof(double) * lwork );
91  if( work == NULL ) {
93  goto exit_level_1;
94  }
95  /* Call middle-level interface */
96  info = LAPACKE_dstegr_work( matrix_layout, jobz, range, n, d, e, vl, vu, il,
97  iu, abstol, m, w, z, ldz, isuppz, work, lwork,
98  iwork, liwork );
99  /* Release memory and exit */
100  LAPACKE_free( work );
101 exit_level_1:
102  LAPACKE_free( iwork );
103 exit_level_0:
104  if( info == LAPACK_WORK_MEMORY_ERROR ) {
105  LAPACKE_xerbla( "LAPACKE_dstegr", info );
106  }
107  return info;
108 }
#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 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
lapack_int LAPACKE_dstegr_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, double *z, lapack_int ldz, lapack_int *isuppz, double *work, lapack_int lwork, lapack_int *iwork, lapack_int liwork)
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