LAPACK  3.7.1
LAPACK: Linear Algebra PACKage

◆ LAPACKE_dpteqr()

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

Definition at line 36 of file lapacke_dpteqr.c.

38 {
39  lapack_int info = 0;
40  /* Additional scalars declarations for work arrays */
41  lapack_int lwork;
42  double* work = NULL;
43  if( matrix_layout != LAPACK_COL_MAJOR && matrix_layout != LAPACK_ROW_MAJOR ) {
44  LAPACKE_xerbla( "LAPACKE_dpteqr", -1 );
45  return -1;
46  }
47 #ifndef LAPACK_DISABLE_NAN_CHECK
48  /* Optionally check input matrices for NaNs */
49  if( LAPACKE_d_nancheck( n, d, 1 ) ) {
50  return -4;
51  }
52  if( LAPACKE_d_nancheck( n-1, e, 1 ) ) {
53  return -5;
54  }
55  if( LAPACKE_lsame( compz, 'v' ) ) {
56  if( LAPACKE_dge_nancheck( matrix_layout, n, n, z, ldz ) ) {
57  return -6;
58  }
59  }
60 #endif
61  /* Additional scalars initializations for work arrays */
62  if( LAPACKE_lsame( compz, 'n' ) ) {
63  lwork = 1;
64  } else {
65  lwork = MAX(1,4*n-4);
66  }
67  /* Allocate memory for working array(s) */
68  work = (double*)LAPACKE_malloc( sizeof(double) * lwork );
69  if( work == NULL ) {
71  goto exit_level_0;
72  }
73  /* Call middle-level interface */
74  info = LAPACKE_dpteqr_work( matrix_layout, compz, n, d, e, z, ldz, work );
75  /* Release memory and exit */
76  LAPACKE_free( work );
77 exit_level_0:
78  if( info == LAPACK_WORK_MEMORY_ERROR ) {
79  LAPACKE_xerbla( "LAPACKE_dpteqr", info );
80  }
81  return info;
82 }
#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
lapack_logical LAPACKE_dge_nancheck(int matrix_layout, lapack_int m, lapack_int n, const double *a, lapack_int lda)
#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_dpteqr_work(int matrix_layout, char compz, lapack_int n, double *d, double *e, double *z, lapack_int ldz, double *work)
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