LAPACK  3.6.1 LAPACK: Linear Algebra PACKage
 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 36 of file lapacke_dgeqp3_work.c.

39 {
40  lapack_int info = 0;
41  if( matrix_layout == LAPACK_COL_MAJOR ) {
42  /* Call LAPACK function and adjust info */
43  LAPACK_dgeqp3( &m, &n, a, &lda, jpvt, tau, work, &lwork, &info );
44  if( info < 0 ) {
45  info = info - 1;
46  }
47  } else if( matrix_layout == LAPACK_ROW_MAJOR ) {
48  lapack_int lda_t = MAX(1,m);
49  double* a_t = NULL;
50  /* Check leading dimension(s) */
51  if( lda < n ) {
52  info = -5;
53  LAPACKE_xerbla( "LAPACKE_dgeqp3_work", info );
54  return info;
55  }
56  /* Query optimal working array(s) size if requested */
57  if( lwork == -1 ) {
58  LAPACK_dgeqp3( &m, &n, a, &lda_t, jpvt, tau, work, &lwork, &info );
59  return (info < 0) ? (info - 1) : info;
60  }
61  /* Allocate memory for temporary array(s) */
62  a_t = (double*)LAPACKE_malloc( sizeof(double) * lda_t * MAX(1,n) );
63  if( a_t == NULL ) {
65  goto exit_level_0;
66  }
67  /* Transpose input matrices */
68  LAPACKE_dge_trans( matrix_layout, m, n, a, lda, a_t, lda_t );
69  /* Call LAPACK function and adjust info */
70  LAPACK_dgeqp3( &m, &n, a_t, &lda_t, jpvt, tau, work, &lwork, &info );
71  if( info < 0 ) {
72  info = info - 1;
73  }
74  /* Transpose output matrices */
75  LAPACKE_dge_trans( LAPACK_COL_MAJOR, m, n, a_t, lda_t, a, lda );
76  /* Release memory and exit */
77  LAPACKE_free( a_t );
78 exit_level_0:
79  if( info == LAPACK_TRANSPOSE_MEMORY_ERROR ) {
80  LAPACKE_xerbla( "LAPACKE_dgeqp3_work", info );
81  }
82  } else {
83  info = -1;
84  LAPACKE_xerbla( "LAPACKE_dgeqp3_work", info );
85  }
86  return info;
87 }
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 MAX(x, y)
Definition: lapacke_utils.h:47
#define LAPACKE_free(p)
Definition: lapacke.h:113
#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
void LAPACK_dgeqp3(lapack_int *m, lapack_int *n, double *a, lapack_int *lda, lapack_int *jpvt, double *tau, double *work, lapack_int *lwork, lapack_int *info)

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