LAPACK  3.8.0
LAPACK: Linear Algebra PACKage

◆ LAPACKE_dtgexc()

lapack_int LAPACKE_dtgexc ( int  matrix_layout,
lapack_logical  wantq,
lapack_logical  wantz,
lapack_int  n,
double *  a,
lapack_int  lda,
double *  b,
lapack_int  ldb,
double *  q,
lapack_int  ldq,
double *  z,
lapack_int  ldz,
lapack_int ifst,
lapack_int ilst 
)

Definition at line 36 of file lapacke_dtgexc.c.

41 {
42  lapack_int info = 0;
43  lapack_int lwork = -1;
44  double* work = NULL;
45  double work_query;
46  if( matrix_layout != LAPACK_COL_MAJOR && matrix_layout != LAPACK_ROW_MAJOR ) {
47  LAPACKE_xerbla( "LAPACKE_dtgexc", -1 );
48  return -1;
49  }
50 #ifndef LAPACK_DISABLE_NAN_CHECK
51  if( LAPACKE_get_nancheck() ) {
52  /* Optionally check input matrices for NaNs */
53  if( LAPACKE_dge_nancheck( matrix_layout, n, n, a, lda ) ) {
54  return -5;
55  }
56  if( LAPACKE_dge_nancheck( matrix_layout, n, n, b, ldb ) ) {
57  return -7;
58  }
59  if( wantq ) {
60  if( LAPACKE_dge_nancheck( matrix_layout, n, n, q, ldq ) ) {
61  return -9;
62  }
63  }
64  if( wantz ) {
65  if( LAPACKE_dge_nancheck( matrix_layout, n, n, z, ldz ) ) {
66  return -11;
67  }
68  }
69  }
70 #endif
71  /* Query optimal working array(s) size */
72  info = LAPACKE_dtgexc_work( matrix_layout, wantq, wantz, n, a, lda, b, ldb,
73  q, ldq, z, ldz, ifst, ilst, &work_query,
74  lwork );
75  if( info != 0 ) {
76  goto exit_level_0;
77  }
78  lwork = (lapack_int)work_query;
79  /* Allocate memory for work arrays */
80  work = (double*)LAPACKE_malloc( sizeof(double) * lwork );
81  if( work == NULL ) {
83  goto exit_level_0;
84  }
85  /* Call middle-level interface */
86  info = LAPACKE_dtgexc_work( matrix_layout, wantq, wantz, n, a, lda, b, ldb,
87  q, ldq, z, ldz, ifst, ilst, work, lwork );
88  /* Release memory and exit */
89  LAPACKE_free( work );
90 exit_level_0:
91  if( info == LAPACK_WORK_MEMORY_ERROR ) {
92  LAPACKE_xerbla( "LAPACKE_dtgexc", info );
93  }
94  return info;
95 }
lapack_int LAPACKE_dtgexc_work(int matrix_layout, lapack_logical wantq, lapack_logical wantz, lapack_int n, double *a, lapack_int lda, double *b, lapack_int ldb, double *q, lapack_int ldq, double *z, lapack_int ldz, lapack_int *ifst, lapack_int *ilst, double *work, lapack_int lwork)
#define LAPACK_ROW_MAJOR
Definition: lapacke.h:119
#define LAPACK_WORK_MEMORY_ERROR
Definition: lapacke.h:122
#define LAPACKE_free(p)
Definition: lapacke.h:113
lapack_logical LAPACKE_dge_nancheck(int matrix_layout, lapack_int m, lapack_int n, const double *a, lapack_int lda)
#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
int LAPACKE_get_nancheck()
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