LAPACK  3.7.1
LAPACK: Linear Algebra PACKage

◆ LAPACKE_dgbtrs_work()

lapack_int LAPACKE_dgbtrs_work ( int  matrix_layout,
char  trans,
lapack_int  n,
lapack_int  kl,
lapack_int  ku,
lapack_int  nrhs,
const double *  ab,
lapack_int  ldab,
const lapack_int ipiv,
double *  b,
lapack_int  ldb 
)

Definition at line 36 of file lapacke_dgbtrs_work.c.

41 {
42  lapack_int info = 0;
43  if( matrix_layout == LAPACK_COL_MAJOR ) {
44  /* Call LAPACK function and adjust info */
45  LAPACK_dgbtrs( &trans, &n, &kl, &ku, &nrhs, ab, &ldab, ipiv, b, &ldb,
46  &info );
47  if( info < 0 ) {
48  info = info - 1;
49  }
50  } else if( matrix_layout == LAPACK_ROW_MAJOR ) {
51  lapack_int ldab_t = MAX(1,2*kl+ku+1);
52  lapack_int ldb_t = MAX(1,n);
53  double* ab_t = NULL;
54  double* b_t = NULL;
55  /* Check leading dimension(s) */
56  if( ldab < n ) {
57  info = -8;
58  LAPACKE_xerbla( "LAPACKE_dgbtrs_work", info );
59  return info;
60  }
61  if( ldb < nrhs ) {
62  info = -11;
63  LAPACKE_xerbla( "LAPACKE_dgbtrs_work", info );
64  return info;
65  }
66  /* Allocate memory for temporary array(s) */
67  ab_t = (double*)LAPACKE_malloc( sizeof(double) * ldab_t * MAX(1,n) );
68  if( ab_t == NULL ) {
70  goto exit_level_0;
71  }
72  b_t = (double*)LAPACKE_malloc( sizeof(double) * ldb_t * MAX(1,nrhs) );
73  if( b_t == NULL ) {
75  goto exit_level_1;
76  }
77  /* Transpose input matrices */
78  LAPACKE_dgb_trans( matrix_layout, n, n, kl, kl+ku, ab, ldab, ab_t,
79  ldab_t );
80  LAPACKE_dge_trans( matrix_layout, n, nrhs, b, ldb, b_t, ldb_t );
81  /* Call LAPACK function and adjust info */
82  LAPACK_dgbtrs( &trans, &n, &kl, &ku, &nrhs, ab_t, &ldab_t, ipiv, b_t,
83  &ldb_t, &info );
84  if( info < 0 ) {
85  info = info - 1;
86  }
87  /* Transpose output matrices */
88  LAPACKE_dge_trans( LAPACK_COL_MAJOR, n, nrhs, b_t, ldb_t, b, ldb );
89  /* Release memory and exit */
90  LAPACKE_free( b_t );
91 exit_level_1:
92  LAPACKE_free( ab_t );
93 exit_level_0:
94  if( info == LAPACK_TRANSPOSE_MEMORY_ERROR ) {
95  LAPACKE_xerbla( "LAPACKE_dgbtrs_work", info );
96  }
97  } else {
98  info = -1;
99  LAPACKE_xerbla( "LAPACKE_dgbtrs_work", info );
100  }
101  return info;
102 }
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
void LAPACKE_dgb_trans(int matrix_layout, lapack_int m, lapack_int n, lapack_int kl, lapack_int ku, const double *in, lapack_int ldin, double *out, lapack_int ldout)
#define LAPACKE_free(p)
Definition: lapacke.h:113
void LAPACK_dgbtrs(char *trans, lapack_int *n, lapack_int *kl, lapack_int *ku, lapack_int *nrhs, const double *ab, lapack_int *ldab, const lapack_int *ipiv, double *b, lapack_int *ldb, 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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