LAPACK  3.8.0
LAPACK: Linear Algebra PACKage

◆ LAPACKE_dgttrs_work()

lapack_int LAPACKE_dgttrs_work ( int  matrix_layout,
char  trans,
lapack_int  n,
lapack_int  nrhs,
const double *  dl,
const double *  d,
const double *  du,
const double *  du2,
const lapack_int ipiv,
double *  b,
lapack_int  ldb 
)

Definition at line 36 of file lapacke_dgttrs_work.c.

41 {
42  lapack_int info = 0;
43  if( matrix_layout == LAPACK_COL_MAJOR ) {
44  /* Call LAPACK function and adjust info */
45  LAPACK_dgttrs( &trans, &n, &nrhs, dl, d, du, du2, 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 ldb_t = MAX(1,n);
52  double* b_t = NULL;
53  /* Check leading dimension(s) */
54  if( ldb < nrhs ) {
55  info = -11;
56  LAPACKE_xerbla( "LAPACKE_dgttrs_work", info );
57  return info;
58  }
59  /* Allocate memory for temporary array(s) */
60  b_t = (double*)LAPACKE_malloc( sizeof(double) * ldb_t * MAX(1,nrhs) );
61  if( b_t == NULL ) {
63  goto exit_level_0;
64  }
65  /* Transpose input matrices */
66  LAPACKE_dge_trans( matrix_layout, n, nrhs, b, ldb, b_t, ldb_t );
67  /* Call LAPACK function and adjust info */
68  LAPACK_dgttrs( &trans, &n, &nrhs, dl, d, du, du2, ipiv, b_t, &ldb_t,
69  &info );
70  if( info < 0 ) {
71  info = info - 1;
72  }
73  /* Transpose output matrices */
74  LAPACKE_dge_trans( LAPACK_COL_MAJOR, n, nrhs, b_t, ldb_t, b, ldb );
75  /* Release memory and exit */
76  LAPACKE_free( b_t );
77 exit_level_0:
78  if( info == LAPACK_TRANSPOSE_MEMORY_ERROR ) {
79  LAPACKE_xerbla( "LAPACKE_dgttrs_work", info );
80  }
81  } else {
82  info = -1;
83  LAPACKE_xerbla( "LAPACKE_dgttrs_work", info );
84  }
85  return info;
86 }
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
void LAPACK_dgttrs(char *trans, lapack_int *n, lapack_int *nrhs, const double *dl, const double *d, const double *du, const double *du2, const lapack_int *ipiv, double *b, lapack_int *ldb, lapack_int *info)
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