LAPACK  3.8.0
LAPACK: Linear Algebra PACKage

◆ LAPACKE_dstevr()

lapack_int LAPACKE_dstevr ( 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_dstevr.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_dstevr", -1 );
51  return -1;
52  }
53 #ifndef LAPACK_DISABLE_NAN_CHECK
54  if( LAPACKE_get_nancheck() ) {
55  /* Optionally check input matrices for NaNs */
56  if( LAPACKE_d_nancheck( 1, &abstol, 1 ) ) {
57  return -11;
58  }
59  if( LAPACKE_d_nancheck( n, d, 1 ) ) {
60  return -5;
61  }
62  if( LAPACKE_d_nancheck( n-1, e, 1 ) ) {
63  return -6;
64  }
65  if( LAPACKE_lsame( range, 'v' ) ) {
66  if( LAPACKE_d_nancheck( 1, &vl, 1 ) ) {
67  return -7;
68  }
69  }
70  if( LAPACKE_lsame( range, 'v' ) ) {
71  if( LAPACKE_d_nancheck( 1, &vu, 1 ) ) {
72  return -8;
73  }
74  }
75  }
76 #endif
77  /* Query optimal working array(s) size */
78  info = LAPACKE_dstevr_work( matrix_layout, jobz, range, n, d, e, vl, vu, il,
79  iu, abstol, m, w, z, ldz, isuppz, &work_query,
80  lwork, &iwork_query, liwork );
81  if( info != 0 ) {
82  goto exit_level_0;
83  }
84  liwork = (lapack_int)iwork_query;
85  lwork = (lapack_int)work_query;
86  /* Allocate memory for work arrays */
87  iwork = (lapack_int*)LAPACKE_malloc( sizeof(lapack_int) * liwork );
88  if( iwork == NULL ) {
90  goto exit_level_0;
91  }
92  work = (double*)LAPACKE_malloc( sizeof(double) * lwork );
93  if( work == NULL ) {
95  goto exit_level_1;
96  }
97  /* Call middle-level interface */
98  info = LAPACKE_dstevr_work( matrix_layout, jobz, range, n, d, e, vl, vu, il,
99  iu, abstol, m, w, z, ldz, isuppz, work, lwork,
100  iwork, liwork );
101  /* Release memory and exit */
102  LAPACKE_free( work );
103 exit_level_1:
104  LAPACKE_free( iwork );
105 exit_level_0:
106  if( info == LAPACK_WORK_MEMORY_ERROR ) {
107  LAPACKE_xerbla( "LAPACKE_dstevr", info );
108  }
109  return info;
110 }
#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_int LAPACKE_dstevr_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)
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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