LAPACK  3.7.1
LAPACK: Linear Algebra PACKage

◆ LAPACKE_dgehrd()

lapack_int LAPACKE_dgehrd ( int  matrix_layout,
lapack_int  n,
lapack_int  ilo,
lapack_int  ihi,
double *  a,
lapack_int  lda,
double *  tau 
)

Definition at line 36 of file lapacke_dgehrd.c.

39 {
40  lapack_int info = 0;
41  lapack_int lwork = -1;
42  double* work = NULL;
43  double work_query;
44  if( matrix_layout != LAPACK_COL_MAJOR && matrix_layout != LAPACK_ROW_MAJOR ) {
45  LAPACKE_xerbla( "LAPACKE_dgehrd", -1 );
46  return -1;
47  }
48 #ifndef LAPACK_DISABLE_NAN_CHECK
49  /* Optionally check input matrices for NaNs */
50  if( LAPACKE_dge_nancheck( matrix_layout, n, n, a, lda ) ) {
51  return -5;
52  }
53 #endif
54  /* Query optimal working array(s) size */
55  info = LAPACKE_dgehrd_work( matrix_layout, n, ilo, ihi, a, lda, tau,
56  &work_query, lwork );
57  if( info != 0 ) {
58  goto exit_level_0;
59  }
60  lwork = (lapack_int)work_query;
61  /* Allocate memory for work arrays */
62  work = (double*)LAPACKE_malloc( sizeof(double) * lwork );
63  if( work == NULL ) {
65  goto exit_level_0;
66  }
67  /* Call middle-level interface */
68  info = LAPACKE_dgehrd_work( matrix_layout, n, ilo, ihi, a, lda, tau, work,
69  lwork );
70  /* Release memory and exit */
71  LAPACKE_free( work );
72 exit_level_0:
73  if( info == LAPACK_WORK_MEMORY_ERROR ) {
74  LAPACKE_xerbla( "LAPACKE_dgehrd", info );
75  }
76  return info;
77 }
#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_dgehrd_work(int matrix_layout, lapack_int n, lapack_int ilo, lapack_int ihi, double *a, lapack_int lda, double *tau, double *work, lapack_int lwork)
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
#define LAPACK_COL_MAJOR
Definition: lapacke.h:120
void LAPACKE_xerbla(const char *name, lapack_int info)
#define lapack_int
Definition: lapacke.h:47
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