LAPACK  3.8.0
LAPACK: Linear Algebra PACKage

◆ LAPACKE_dgerfs_work()

lapack_int LAPACKE_dgerfs_work ( int  matrix_layout,
char  trans,
lapack_int  n,
lapack_int  nrhs,
const double *  a,
lapack_int  lda,
const double *  af,
lapack_int  ldaf,
const lapack_int ipiv,
const double *  b,
lapack_int  ldb,
double *  x,
lapack_int  ldx,
double *  ferr,
double *  berr,
double *  work,
lapack_int iwork 
)

Definition at line 36 of file lapacke_dgerfs_work.c.

43 {
44  lapack_int info = 0;
45  if( matrix_layout == LAPACK_COL_MAJOR ) {
46  /* Call LAPACK function and adjust info */
47  LAPACK_dgerfs( &trans, &n, &nrhs, a, &lda, af, &ldaf, ipiv, b, &ldb, x,
48  &ldx, ferr, berr, work, iwork, &info );
49  if( info < 0 ) {
50  info = info - 1;
51  }
52  } else if( matrix_layout == LAPACK_ROW_MAJOR ) {
53  lapack_int lda_t = MAX(1,n);
54  lapack_int ldaf_t = MAX(1,n);
55  lapack_int ldb_t = MAX(1,n);
56  lapack_int ldx_t = MAX(1,n);
57  double* a_t = NULL;
58  double* af_t = NULL;
59  double* b_t = NULL;
60  double* x_t = NULL;
61  /* Check leading dimension(s) */
62  if( lda < n ) {
63  info = -6;
64  LAPACKE_xerbla( "LAPACKE_dgerfs_work", info );
65  return info;
66  }
67  if( ldaf < n ) {
68  info = -8;
69  LAPACKE_xerbla( "LAPACKE_dgerfs_work", info );
70  return info;
71  }
72  if( ldb < nrhs ) {
73  info = -11;
74  LAPACKE_xerbla( "LAPACKE_dgerfs_work", info );
75  return info;
76  }
77  if( ldx < nrhs ) {
78  info = -13;
79  LAPACKE_xerbla( "LAPACKE_dgerfs_work", info );
80  return info;
81  }
82  /* Allocate memory for temporary array(s) */
83  a_t = (double*)LAPACKE_malloc( sizeof(double) * lda_t * MAX(1,n) );
84  if( a_t == NULL ) {
86  goto exit_level_0;
87  }
88  af_t = (double*)LAPACKE_malloc( sizeof(double) * ldaf_t * MAX(1,n) );
89  if( af_t == NULL ) {
91  goto exit_level_1;
92  }
93  b_t = (double*)LAPACKE_malloc( sizeof(double) * ldb_t * MAX(1,nrhs) );
94  if( b_t == NULL ) {
96  goto exit_level_2;
97  }
98  x_t = (double*)LAPACKE_malloc( sizeof(double) * ldx_t * MAX(1,nrhs) );
99  if( x_t == NULL ) {
101  goto exit_level_3;
102  }
103  /* Transpose input matrices */
104  LAPACKE_dge_trans( matrix_layout, n, n, a, lda, a_t, lda_t );
105  LAPACKE_dge_trans( matrix_layout, n, n, af, ldaf, af_t, ldaf_t );
106  LAPACKE_dge_trans( matrix_layout, n, nrhs, b, ldb, b_t, ldb_t );
107  LAPACKE_dge_trans( matrix_layout, n, nrhs, x, ldx, x_t, ldx_t );
108  /* Call LAPACK function and adjust info */
109  LAPACK_dgerfs( &trans, &n, &nrhs, a_t, &lda_t, af_t, &ldaf_t, ipiv, b_t,
110  &ldb_t, x_t, &ldx_t, ferr, berr, work, iwork, &info );
111  if( info < 0 ) {
112  info = info - 1;
113  }
114  /* Transpose output matrices */
115  LAPACKE_dge_trans( LAPACK_COL_MAJOR, n, nrhs, x_t, ldx_t, x, ldx );
116  /* Release memory and exit */
117  LAPACKE_free( x_t );
118 exit_level_3:
119  LAPACKE_free( b_t );
120 exit_level_2:
121  LAPACKE_free( af_t );
122 exit_level_1:
123  LAPACKE_free( a_t );
124 exit_level_0:
125  if( info == LAPACK_TRANSPOSE_MEMORY_ERROR ) {
126  LAPACKE_xerbla( "LAPACKE_dgerfs_work", info );
127  }
128  } else {
129  info = -1;
130  LAPACKE_xerbla( "LAPACKE_dgerfs_work", info );
131  }
132  return info;
133 }
void LAPACK_dgerfs(char *trans, lapack_int *n, lapack_int *nrhs, const double *a, lapack_int *lda, const double *af, lapack_int *ldaf, const lapack_int *ipiv, const double *b, lapack_int *ldb, double *x, lapack_int *ldx, double *ferr, double *berr, double *work, lapack_int *iwork, lapack_int *info)
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
#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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