LAPACK  3.8.0
LAPACK: Linear Algebra PACKage

◆ LAPACKE_dtrexc_work()

lapack_int LAPACKE_dtrexc_work ( int  matrix_layout,
char  compq,
lapack_int  n,
double *  t,
lapack_int  ldt,
double *  q,
lapack_int  ldq,
lapack_int ifst,
lapack_int ilst,
double *  work 
)

Definition at line 36 of file lapacke_dtrexc_work.c.

40 {
41  lapack_int info = 0;
42  if( matrix_layout == LAPACK_COL_MAJOR ) {
43  /* Call LAPACK function and adjust info */
44  LAPACK_dtrexc( &compq, &n, t, &ldt, q, &ldq, ifst, ilst, work, &info );
45  if( info < 0 ) {
46  info = info - 1;
47  }
48  } else if( matrix_layout == LAPACK_ROW_MAJOR ) {
49  lapack_int ldq_t = MAX(1,n);
50  lapack_int ldt_t = MAX(1,n);
51  double* t_t = NULL;
52  double* q_t = NULL;
53  /* Check leading dimension(s) */
54  if( ldq < n && LAPACKE_lsame( compq, 'v' ) ) {
55  info = -7;
56  LAPACKE_xerbla( "LAPACKE_dtrexc_work", info );
57  return info;
58  }
59  if( ldt < n ) {
60  info = -5;
61  LAPACKE_xerbla( "LAPACKE_dtrexc_work", info );
62  return info;
63  }
64  /* Allocate memory for temporary array(s) */
65  t_t = (double*)LAPACKE_malloc( sizeof(double) * ldt_t * MAX(1,n) );
66  if( t_t == NULL ) {
68  goto exit_level_0;
69  }
70  if( LAPACKE_lsame( compq, 'v' ) ) {
71  q_t = (double*)LAPACKE_malloc( sizeof(double) * ldq_t * MAX(1,n) );
72  if( q_t == NULL ) {
74  goto exit_level_1;
75  }
76  }
77  /* Transpose input matrices */
78  LAPACKE_dge_trans( matrix_layout, n, n, t, ldt, t_t, ldt_t );
79  if( LAPACKE_lsame( compq, 'v' ) ) {
80  LAPACKE_dge_trans( matrix_layout, n, n, q, ldq, q_t, ldq_t );
81  }
82  /* Call LAPACK function and adjust info */
83  LAPACK_dtrexc( &compq, &n, t_t, &ldt_t, q_t, &ldq_t, ifst, ilst, work,
84  &info );
85  if( info < 0 ) {
86  info = info - 1;
87  }
88  /* Transpose output matrices */
89  LAPACKE_dge_trans( LAPACK_COL_MAJOR, n, n, t_t, ldt_t, t, ldt );
90  if( LAPACKE_lsame( compq, 'v' ) ) {
91  LAPACKE_dge_trans( LAPACK_COL_MAJOR, n, n, q_t, ldq_t, q, ldq );
92  }
93  /* Release memory and exit */
94  if( LAPACKE_lsame( compq, 'v' ) ) {
95  LAPACKE_free( q_t );
96  }
97 exit_level_1:
98  LAPACKE_free( t_t );
99 exit_level_0:
100  if( info == LAPACK_TRANSPOSE_MEMORY_ERROR ) {
101  LAPACKE_xerbla( "LAPACKE_dtrexc_work", info );
102  }
103  } else {
104  info = -1;
105  LAPACKE_xerbla( "LAPACKE_dtrexc_work", info );
106  }
107  return info;
108 }
void LAPACK_dtrexc(char *compq, lapack_int *n, double *t, lapack_int *ldt, double *q, lapack_int *ldq, lapack_int *ifst, lapack_int *ilst, double *work, 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
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
#define LAPACK_TRANSPOSE_MEMORY_ERROR
Definition: lapacke.h:123
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