LAPACK  3.7.1
LAPACK: Linear Algebra PACKage

◆ LAPACKE_dgeqr_work()

lapack_int LAPACKE_dgeqr_work ( int  matrix_layout,
lapack_int  m,
lapack_int  n,
double *  a,
lapack_int  lda,
double *  t,
lapack_int  tsize,
double *  work,
lapack_int  lwork 
)

Definition at line 36 of file lapacke_dgeqr_work.c.

40 {
41  lapack_int info = 0;
42  if( matrix_layout == LAPACK_COL_MAJOR ) {
43  /* Call LAPACK function and adjust info */
44  LAPACK_dgeqr( &m, &n, a, &lda, t, &tsize, work, &lwork, &info );
45  if( info < 0 ) {
46  info = info - 1;
47  }
48  } else if( matrix_layout == LAPACK_ROW_MAJOR ) {
49  lapack_int lda_t = MAX(1,m);
50  double* a_t = NULL;
51  /* Check leading dimension(s) */
52  if( lda < n ) {
53  info = -5;
54  LAPACKE_xerbla( "LAPACKE_dgeqr_work", info );
55  return info;
56  }
57  /* Query optimal working array(s) size if requested */
58  if( tsize == -1 || tsize == -2 || lwork == -1 || lwork == -2) {
59  LAPACK_dgeqr( &m, &n, a, &lda_t, t, &tsize, work, &lwork, &info );
60  return (info < 0) ? (info - 1) : info;
61  }
62  /* Allocate memory for temporary array(s) */
63  a_t = (double*)
64  LAPACKE_malloc( sizeof(double) * lda_t * MAX(1,n) );
65  if( a_t == NULL ) {
67  goto exit_level_0;
68  }
69  /* Transpose input matrices */
70  LAPACKE_dge_trans( matrix_layout, m, n, a, lda, a_t, lda_t );
71  /* Call LAPACK function and adjust info */
72  LAPACK_dgeqr( &m, &n, a_t, &lda_t, t, &tsize, work, &lwork, &info );
73  if( info < 0 ) {
74  info = info - 1;
75  }
76  /* Transpose output matrices */
77  LAPACKE_dge_trans( LAPACK_COL_MAJOR, m, n, a_t, lda_t, a, lda );
78  /* Release memory and exit */
79  LAPACKE_free( a_t );
80 exit_level_0:
81  if( info == LAPACK_TRANSPOSE_MEMORY_ERROR ) {
82  LAPACKE_xerbla( "LAPACKE_dgeqr_work", info );
83  }
84  } else {
85  info = -1;
86  LAPACKE_xerbla( "LAPACKE_dgeqr_work", info );
87  }
88  return info;
89 }
void LAPACKE_dge_trans(int matrix_layout, lapack_int m, lapack_int n, const double *in, lapack_int ldin, double *out, lapack_int ldout)
#define LAPACK_ROW_MAJOR
Definition: lapacke.h:119
#define LAPACKE_free(p)
Definition: lapacke.h:113
void LAPACK_dgeqr(lapack_int *m, lapack_int *n, double *a, lapack_int *lda, double *t, lapack_int *tsize, double *work, lapack_int *lwork, lapack_int *info)
#define MAX(x, y)
Definition: lapacke_utils.h:47
#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
#define LAPACK_TRANSPOSE_MEMORY_ERROR
Definition: lapacke.h:123
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