LAPACK  3.10.0
LAPACK: Linear Algebra PACKage

◆ LAPACKE_dgeqp3_work()

lapack_int LAPACKE_dgeqp3_work ( int  matrix_layout,
lapack_int  m,
lapack_int  n,
double *  a,
lapack_int  lda,
lapack_int jpvt,
double *  tau,
double *  work,
lapack_int  lwork 
)

Definition at line 35 of file lapacke_dgeqp3_work.c.

38 {
39  lapack_int info = 0;
40  if( matrix_layout == LAPACK_COL_MAJOR ) {
41  /* Call LAPACK function and adjust info */
42  LAPACK_dgeqp3( &m, &n, a, &lda, jpvt, tau, work, &lwork, &info );
43  if( info < 0 ) {
44  info = info - 1;
45  }
46  } else if( matrix_layout == LAPACK_ROW_MAJOR ) {
47  lapack_int lda_t = MAX(1,m);
48  double* a_t = NULL;
49  /* Check leading dimension(s) */
50  if( lda < n ) {
51  info = -5;
52  LAPACKE_xerbla( "LAPACKE_dgeqp3_work", info );
53  return info;
54  }
55  /* Query optimal working array(s) size if requested */
56  if( lwork == -1 ) {
57  LAPACK_dgeqp3( &m, &n, a, &lda_t, jpvt, tau, work, &lwork, &info );
58  return (info < 0) ? (info - 1) : info;
59  }
60  /* Allocate memory for temporary array(s) */
61  a_t = (double*)LAPACKE_malloc( sizeof(double) * lda_t * MAX(1,n) );
62  if( a_t == NULL ) {
64  goto exit_level_0;
65  }
66  /* Transpose input matrices */
67  LAPACKE_dge_trans( matrix_layout, m, n, a, lda, a_t, lda_t );
68  /* Call LAPACK function and adjust info */
69  LAPACK_dgeqp3( &m, &n, a_t, &lda_t, jpvt, tau, work, &lwork, &info );
70  if( info < 0 ) {
71  info = info - 1;
72  }
73  /* Transpose output matrices */
74  LAPACKE_dge_trans( LAPACK_COL_MAJOR, m, n, a_t, lda_t, a, lda );
75  /* Release memory and exit */
76  LAPACKE_free( a_t );
77 exit_level_0:
78  if( info == LAPACK_TRANSPOSE_MEMORY_ERROR ) {
79  LAPACKE_xerbla( "LAPACKE_dgeqp3_work", info );
80  }
81  } else {
82  info = -1;
83  LAPACKE_xerbla( "LAPACKE_dgeqp3_work", info );
84  }
85  return info;
86 }
void LAPACK_dgeqp3(lapack_int const *m, lapack_int const *n, double *A, lapack_int const *lda, lapack_int *JPVT, double *tau, double *work, lapack_int const *lwork, lapack_int *info)
#define lapack_int
Definition: lapack.h:83
#define LAPACK_COL_MAJOR
Definition: lapacke.h:53
#define LAPACKE_free(p)
Definition: lapacke.h:46
#define LAPACK_ROW_MAJOR
Definition: lapacke.h:52
#define LAPACKE_malloc(size)
Definition: lapacke.h:43
#define LAPACK_TRANSPOSE_MEMORY_ERROR
Definition: lapacke.h:56
void LAPACKE_xerbla(const char *name, lapack_int info)
#define MAX(x, y)
Definition: lapacke_utils.h:46
void LAPACKE_dge_trans(int matrix_layout, lapack_int m, lapack_int n, const double *in, lapack_int ldin, double *out, lapack_int ldout)
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