LAPACK  3.8.0
LAPACK: Linear Algebra PACKage

◆ LAPACKE_dlarfb()

lapack_int LAPACKE_dlarfb ( int  matrix_layout,
char  side,
char  trans,
char  direct,
char  storev,
lapack_int  m,
lapack_int  n,
lapack_int  k,
const double *  v,
lapack_int  ldv,
const double *  t,
lapack_int  ldt,
double *  c,
lapack_int  ldc 
)

Definition at line 36 of file lapacke_dlarfb.c.

41 {
42  lapack_int info = 0;
43  lapack_int ldwork;
44  double* work = NULL;
45  lapack_int ncols_v, nrows_v;
46  if( matrix_layout != LAPACK_COL_MAJOR && matrix_layout != LAPACK_ROW_MAJOR ) {
47  LAPACKE_xerbla( "LAPACKE_dlarfb", -1 );
48  return -1;
49  }
50 #ifndef LAPACK_DISABLE_NAN_CHECK
51  if( LAPACKE_get_nancheck() ) {
52  /* Optionally check input matrices for NaNs */
53  ncols_v = LAPACKE_lsame( storev, 'c' ) ? k :
54  ( ( LAPACKE_lsame( storev, 'r' ) &&
55  LAPACKE_lsame( side, 'l' ) ) ? m :
56  ( ( LAPACKE_lsame( storev, 'r' ) &&
57  LAPACKE_lsame( side, 'r' ) ) ? n : 1) );
58  nrows_v = ( LAPACKE_lsame( storev, 'c' ) &&
59  LAPACKE_lsame( side, 'l' ) ) ? m :
60  ( ( LAPACKE_lsame( storev, 'c' ) &&
61  LAPACKE_lsame( side, 'r' ) ) ? n :
62  ( LAPACKE_lsame( storev, 'r' ) ? k : 1) );
63  if( LAPACKE_dge_nancheck( matrix_layout, m, n, c, ldc ) ) {
64  return -13;
65  }
66  if( LAPACKE_dge_nancheck( matrix_layout, k, k, t, ldt ) ) {
67  return -11;
68  }
69  if( LAPACKE_lsame( storev, 'c' ) && LAPACKE_lsame( direct, 'f' ) ) {
70  if( LAPACKE_dtr_nancheck( matrix_layout, 'l', 'u', k, v, ldv ) )
71  return -9;
72  if( LAPACKE_dge_nancheck( matrix_layout, nrows_v-k, ncols_v, &v[k*ldv],
73  ldv ) )
74  return -9;
75  } else if( LAPACKE_lsame( storev, 'c' ) && LAPACKE_lsame( direct, 'b' ) ) {
76  if( k > nrows_v ) {
77  LAPACKE_xerbla( "LAPACKE_dlarfb", -8 );
78  return -8;
79  }
80  if( LAPACKE_dtr_nancheck( matrix_layout, 'u', 'u', k,
81  &v[(nrows_v-k)*ldv], ldv ) )
82  return -9;
83  if( LAPACKE_dge_nancheck( matrix_layout, nrows_v-k, ncols_v, v, ldv ) )
84  return -9;
85  } else if( LAPACKE_lsame( storev, 'r' ) && LAPACKE_lsame( direct, 'f' ) ) {
86  if( LAPACKE_dtr_nancheck( matrix_layout, 'u', 'u', k, v, ldv ) )
87  return -9;
88  if( LAPACKE_dge_nancheck( matrix_layout, nrows_v, ncols_v-k, &v[k],
89  ldv ) )
90  return -9;
91  } else if( LAPACKE_lsame( storev, 'r' ) && LAPACKE_lsame( direct, 'f' ) ) {
92  if( k > ncols_v ) {
93  LAPACKE_xerbla( "LAPACKE_dlarfb", -8 );
94  return -8;
95  }
96  if( LAPACKE_dtr_nancheck( matrix_layout, 'l', 'u', k, &v[ncols_v-k],
97  ldv ) )
98  return -9;
99  if( LAPACKE_dge_nancheck( matrix_layout, nrows_v, ncols_v-k, v, ldv ) )
100  return -9;
101  }
102  }
103 #endif
104  if( LAPACKE_lsame( side, 'l' ) ) {
105  ldwork = n;
106  } else if( LAPACKE_lsame( side, 'r' ) ) {
107  ldwork = m;
108  } else {
109  ldwork = 1;
110  }
111  /* Allocate memory for working array(s) */
112  work = (double*)LAPACKE_malloc( sizeof(double) * ldwork * MAX(1,k) );
113  if( work == NULL ) {
115  goto exit_level_0;
116  }
117  /* Call middle-level interface */
118  info = LAPACKE_dlarfb_work( matrix_layout, side, trans, direct, storev, m, n,
119  k, v, ldv, t, ldt, c, ldc, work, ldwork );
120  /* Release memory and exit */
121  LAPACKE_free( work );
122 exit_level_0:
123  if( info == LAPACK_WORK_MEMORY_ERROR ) {
124  LAPACKE_xerbla( "LAPACKE_dlarfb", info );
125  }
126  return info;
127 }
lapack_int LAPACKE_dlarfb_work(int matrix_layout, char side, char trans, char direct, char storev, lapack_int m, lapack_int n, lapack_int k, const double *v, lapack_int ldv, const double *t, lapack_int ldt, double *c, lapack_int ldc, double *work, lapack_int ldwork)
#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_logical LAPACKE_dtr_nancheck(int matrix_layout, char uplo, char diag, lapack_int n, const double *a, lapack_int lda)
#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_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
int LAPACKE_get_nancheck()
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