LAPACK  3.8.0
LAPACK: Linear Algebra PACKage

◆ LAPACKE_dtbtrs_work()

lapack_int LAPACKE_dtbtrs_work ( int  matrix_layout,
char  uplo,
char  trans,
char  diag,
lapack_int  n,
lapack_int  kd,
lapack_int  nrhs,
const double *  ab,
lapack_int  ldab,
double *  b,
lapack_int  ldb 
)

Definition at line 36 of file lapacke_dtbtrs_work.c.

40 {
41  lapack_int info = 0;
42  if( matrix_layout == LAPACK_COL_MAJOR ) {
43  /* Call LAPACK function and adjust info */
44  LAPACK_dtbtrs( &uplo, &trans, &diag, &n, &kd, &nrhs, ab, &ldab, b, &ldb,
45  &info );
46  if( info < 0 ) {
47  info = info - 1;
48  }
49  } else if( matrix_layout == LAPACK_ROW_MAJOR ) {
50  lapack_int ldab_t = MAX(1,kd+1);
51  lapack_int ldb_t = MAX(1,n);
52  double* ab_t = NULL;
53  double* b_t = NULL;
54  /* Check leading dimension(s) */
55  if( ldab < n ) {
56  info = -9;
57  LAPACKE_xerbla( "LAPACKE_dtbtrs_work", info );
58  return info;
59  }
60  if( ldb < nrhs ) {
61  info = -11;
62  LAPACKE_xerbla( "LAPACKE_dtbtrs_work", info );
63  return info;
64  }
65  /* Allocate memory for temporary array(s) */
66  ab_t = (double*)LAPACKE_malloc( sizeof(double) * ldab_t * MAX(1,n) );
67  if( ab_t == NULL ) {
69  goto exit_level_0;
70  }
71  b_t = (double*)LAPACKE_malloc( sizeof(double) * ldb_t * MAX(1,nrhs) );
72  if( b_t == NULL ) {
74  goto exit_level_1;
75  }
76  /* Transpose input matrices */
77  LAPACKE_dtb_trans( matrix_layout, uplo, diag, n, kd, ab, ldab, ab_t,
78  ldab_t );
79  LAPACKE_dge_trans( matrix_layout, n, nrhs, b, ldb, b_t, ldb_t );
80  /* Call LAPACK function and adjust info */
81  LAPACK_dtbtrs( &uplo, &trans, &diag, &n, &kd, &nrhs, ab_t, &ldab_t, b_t,
82  &ldb_t, &info );
83  if( info < 0 ) {
84  info = info - 1;
85  }
86  /* Transpose output matrices */
87  LAPACKE_dge_trans( LAPACK_COL_MAJOR, n, nrhs, b_t, ldb_t, b, ldb );
88  /* Release memory and exit */
89  LAPACKE_free( b_t );
90 exit_level_1:
91  LAPACKE_free( ab_t );
92 exit_level_0:
93  if( info == LAPACK_TRANSPOSE_MEMORY_ERROR ) {
94  LAPACKE_xerbla( "LAPACKE_dtbtrs_work", info );
95  }
96  } else {
97  info = -1;
98  LAPACKE_xerbla( "LAPACKE_dtbtrs_work", info );
99  }
100  return info;
101 }
void LAPACKE_dge_trans(int matrix_layout, lapack_int m, lapack_int n, const double *in, lapack_int ldin, double *out, lapack_int ldout)
void LAPACK_dtbtrs(char *uplo, char *trans, char *diag, lapack_int *n, lapack_int *kd, lapack_int *nrhs, const double *ab, lapack_int *ldab, double *b, lapack_int *ldb, lapack_int *info)
#define LAPACK_ROW_MAJOR
Definition: lapacke.h:119
#define LAPACKE_free(p)
Definition: lapacke.h:113
void LAPACKE_dtb_trans(int matrix_layout, char uplo, char diag, lapack_int n, lapack_int kd, const double *in, lapack_int ldin, double *out, lapack_int ldout)
#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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