LAPACK  3.8.0
LAPACK: Linear Algebra PACKage

◆ LAPACKE_shseqr_work()

lapack_int LAPACKE_shseqr_work ( int  matrix_layout,
char  job,
char  compz,
lapack_int  n,
lapack_int  ilo,
lapack_int  ihi,
float *  h,
lapack_int  ldh,
float *  wr,
float *  wi,
float *  z,
lapack_int  ldz,
float *  work,
lapack_int  lwork 
)

Definition at line 36 of file lapacke_shseqr_work.c.

41 {
42  lapack_int info = 0;
43  if( matrix_layout == LAPACK_COL_MAJOR ) {
44  /* Call LAPACK function and adjust info */
45  LAPACK_shseqr( &job, &compz, &n, &ilo, &ihi, h, &ldh, wr, wi, z, &ldz,
46  work, &lwork, &info );
47  if( info < 0 ) {
48  info = info - 1;
49  }
50  } else if( matrix_layout == LAPACK_ROW_MAJOR ) {
51  lapack_int ldh_t = MAX(1,n);
52  lapack_int ldz_t = MAX(1,n);
53  float* h_t = NULL;
54  float* z_t = NULL;
55  /* Check leading dimension(s) */
56  if( ldh < n ) {
57  info = -8;
58  LAPACKE_xerbla( "LAPACKE_shseqr_work", info );
59  return info;
60  }
61  if( ldz < n ) {
62  info = -12;
63  LAPACKE_xerbla( "LAPACKE_shseqr_work", info );
64  return info;
65  }
66  /* Query optimal working array(s) size if requested */
67  if( lwork == -1 ) {
68  LAPACK_shseqr( &job, &compz, &n, &ilo, &ihi, h, &ldh_t, wr, wi, z,
69  &ldz_t, work, &lwork, &info );
70  return (info < 0) ? (info - 1) : info;
71  }
72  /* Allocate memory for temporary array(s) */
73  h_t = (float*)LAPACKE_malloc( sizeof(float) * ldh_t * MAX(1,n) );
74  if( h_t == NULL ) {
76  goto exit_level_0;
77  }
78  if( LAPACKE_lsame( compz, 'i' ) || LAPACKE_lsame( compz, 'v' ) ) {
79  z_t = (float*)LAPACKE_malloc( sizeof(float) * ldz_t * MAX(1,n) );
80  if( z_t == NULL ) {
82  goto exit_level_1;
83  }
84  }
85  /* Transpose input matrices */
86  LAPACKE_sge_trans( matrix_layout, n, n, h, ldh, h_t, ldh_t );
87  if( LAPACKE_lsame( compz, 'v' ) ) {
88  LAPACKE_sge_trans( matrix_layout, n, n, z, ldz, z_t, ldz_t );
89  }
90  /* Call LAPACK function and adjust info */
91  LAPACK_shseqr( &job, &compz, &n, &ilo, &ihi, h_t, &ldh_t, wr, wi, z_t,
92  &ldz_t, work, &lwork, &info );
93  if( info < 0 ) {
94  info = info - 1;
95  }
96  /* Transpose output matrices */
97  LAPACKE_sge_trans( LAPACK_COL_MAJOR, n, n, h_t, ldh_t, h, ldh );
98  if( LAPACKE_lsame( compz, 'i' ) || LAPACKE_lsame( compz, 'v' ) ) {
99  LAPACKE_sge_trans( LAPACK_COL_MAJOR, n, n, z_t, ldz_t, z, ldz );
100  }
101  /* Release memory and exit */
102  if( LAPACKE_lsame( compz, 'i' ) || LAPACKE_lsame( compz, 'v' ) ) {
103  LAPACKE_free( z_t );
104  }
105 exit_level_1:
106  LAPACKE_free( h_t );
107 exit_level_0:
108  if( info == LAPACK_TRANSPOSE_MEMORY_ERROR ) {
109  LAPACKE_xerbla( "LAPACKE_shseqr_work", info );
110  }
111  } else {
112  info = -1;
113  LAPACKE_xerbla( "LAPACKE_shseqr_work", info );
114  }
115  return info;
116 }
#define LAPACK_ROW_MAJOR
Definition: lapacke.h:119
#define LAPACKE_free(p)
Definition: lapacke.h:113
void LAPACKE_sge_trans(int matrix_layout, lapack_int m, lapack_int n, const float *in, lapack_int ldin, float *out, lapack_int ldout)
#define MAX(x, y)
Definition: lapacke_utils.h:47
void LAPACK_shseqr(char *job, char *compz, lapack_int *n, lapack_int *ilo, lapack_int *ihi, float *h, lapack_int *ldh, float *wr, float *wi, float *z, lapack_int *ldz, float *work, lapack_int *lwork, lapack_int *info)
#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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