LAPACK  3.7.1
LAPACK: Linear Algebra PACKage

◆ LAPACKE_dsteqr_work()

lapack_int LAPACKE_dsteqr_work ( int  matrix_layout,
char  compz,
lapack_int  n,
double *  d,
double *  e,
double *  z,
lapack_int  ldz,
double *  work 
)

Definition at line 36 of file lapacke_dsteqr_work.c.

39 {
40  lapack_int info = 0;
41  if( matrix_layout == LAPACK_COL_MAJOR ) {
42  /* Call LAPACK function and adjust info */
43  LAPACK_dsteqr( &compz, &n, d, e, z, &ldz, work, &info );
44  if( info < 0 ) {
45  info = info - 1;
46  }
47  } else if( matrix_layout == LAPACK_ROW_MAJOR ) {
48  lapack_int ldz_t = MAX(1,n);
49  double* z_t = NULL;
50  /* Check leading dimension(s) */
51  if( ldz < n ) {
52  info = -7;
53  LAPACKE_xerbla( "LAPACKE_dsteqr_work", info );
54  return info;
55  }
56  /* Allocate memory for temporary array(s) */
57  if( LAPACKE_lsame( compz, 'i' ) || LAPACKE_lsame( compz, 'v' ) ) {
58  z_t = (double*)LAPACKE_malloc( sizeof(double) * ldz_t * MAX(1,n) );
59  if( z_t == NULL ) {
61  goto exit_level_0;
62  }
63  }
64  /* Transpose input matrices */
65  if( LAPACKE_lsame( compz, 'v' ) ) {
66  LAPACKE_dge_trans( matrix_layout, n, n, z, ldz, z_t, ldz_t );
67  }
68  /* Call LAPACK function and adjust info */
69  LAPACK_dsteqr( &compz, &n, d, e, z_t, &ldz_t, work, &info );
70  if( info < 0 ) {
71  info = info - 1;
72  }
73  /* Transpose output matrices */
74  if( LAPACKE_lsame( compz, 'i' ) || LAPACKE_lsame( compz, 'v' ) ) {
75  LAPACKE_dge_trans( LAPACK_COL_MAJOR, n, n, z_t, ldz_t, z, ldz );
76  }
77  /* Release memory and exit */
78  if( LAPACKE_lsame( compz, 'i' ) || LAPACKE_lsame( compz, 'v' ) ) {
79  LAPACKE_free( z_t );
80  }
81 exit_level_0:
82  if( info == LAPACK_TRANSPOSE_MEMORY_ERROR ) {
83  LAPACKE_xerbla( "LAPACKE_dsteqr_work", info );
84  }
85  } else {
86  info = -1;
87  LAPACKE_xerbla( "LAPACKE_dsteqr_work", info );
88  }
89  return info;
90 }
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
void LAPACK_dsteqr(char *compz, lapack_int *n, double *d, double *e, double *z, lapack_int *ldz, double *work, lapack_int *info)
#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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