LAPACK  3.8.0
LAPACK: Linear Algebra PACKage

◆ LAPACKE_zpteqr()

lapack_int LAPACKE_zpteqr ( int  matrix_layout,
char  compz,
lapack_int  n,
double *  d,
double *  e,
lapack_complex_double z,
lapack_int  ldz 
)

Definition at line 36 of file lapacke_zpteqr.c.

39 {
40  lapack_int info = 0;
41  /* Additional scalars declarations for work arrays */
42  lapack_int lwork;
43  double* work = NULL;
44  if( matrix_layout != LAPACK_COL_MAJOR && matrix_layout != LAPACK_ROW_MAJOR ) {
45  LAPACKE_xerbla( "LAPACKE_zpteqr", -1 );
46  return -1;
47  }
48 #ifndef LAPACK_DISABLE_NAN_CHECK
49  if( LAPACKE_get_nancheck() ) {
50  /* Optionally check input matrices for NaNs */
51  if( LAPACKE_d_nancheck( n, d, 1 ) ) {
52  return -4;
53  }
54  if( LAPACKE_d_nancheck( n-1, e, 1 ) ) {
55  return -5;
56  }
57  if( LAPACKE_lsame( compz, 'v' ) ) {
58  if( LAPACKE_zge_nancheck( matrix_layout, n, n, z, ldz ) ) {
59  return -6;
60  }
61  }
62  }
63 #endif
64  /* Additional scalars initializations for work arrays */
65  if( LAPACKE_lsame( compz, 'n' ) ) {
66  lwork = 1;
67  } else {
68  lwork = MAX(1,4*n-4);
69  }
70  /* Allocate memory for working array(s) */
71  work = (double*)LAPACKE_malloc( sizeof(double) * lwork );
72  if( work == NULL ) {
74  goto exit_level_0;
75  }
76  /* Call middle-level interface */
77  info = LAPACKE_zpteqr_work( matrix_layout, compz, n, d, e, z, ldz, work );
78  /* Release memory and exit */
79  LAPACKE_free( work );
80 exit_level_0:
81  if( info == LAPACK_WORK_MEMORY_ERROR ) {
82  LAPACKE_xerbla( "LAPACKE_zpteqr", info );
83  }
84  return info;
85 }
#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 MAX(x, y)
Definition: lapacke_utils.h:47
#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
lapack_int LAPACKE_zpteqr_work(int matrix_layout, char compz, lapack_int n, double *d, double *e, lapack_complex_double *z, lapack_int ldz, double *work)
#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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