LAPACK  3.7.1
LAPACK: Linear Algebra PACKage

◆ LAPACKE_shgeqz()

lapack_int LAPACKE_shgeqz ( int  matrix_layout,
char  job,
char  compq,
char  compz,
lapack_int  n,
lapack_int  ilo,
lapack_int  ihi,
float *  h,
lapack_int  ldh,
float *  t,
lapack_int  ldt,
float *  alphar,
float *  alphai,
float *  beta,
float *  q,
lapack_int  ldq,
float *  z,
lapack_int  ldz 
)

Definition at line 36 of file lapacke_shgeqz.c.

41 {
42  lapack_int info = 0;
43  lapack_int lwork = -1;
44  float* work = NULL;
45  float work_query;
46  if( matrix_layout != LAPACK_COL_MAJOR && matrix_layout != LAPACK_ROW_MAJOR ) {
47  LAPACKE_xerbla( "LAPACKE_shgeqz", -1 );
48  return -1;
49  }
50 #ifndef LAPACK_DISABLE_NAN_CHECK
51  /* Optionally check input matrices for NaNs */
52  if( LAPACKE_sge_nancheck( matrix_layout, n, n, h, ldh ) ) {
53  return -8;
54  }
55  if( LAPACKE_lsame( compq, 'i' ) || LAPACKE_lsame( compq, 'v' ) ) {
56  if( LAPACKE_sge_nancheck( matrix_layout, n, n, q, ldq ) ) {
57  return -15;
58  }
59  }
60  if( LAPACKE_sge_nancheck( matrix_layout, n, n, t, ldt ) ) {
61  return -10;
62  }
63  if( LAPACKE_lsame( compz, 'i' ) || LAPACKE_lsame( compz, 'v' ) ) {
64  if( LAPACKE_sge_nancheck( matrix_layout, n, n, z, ldz ) ) {
65  return -17;
66  }
67  }
68 #endif
69  /* Query optimal working array(s) size */
70  info = LAPACKE_shgeqz_work( matrix_layout, job, compq, compz, n, ilo, ihi, h,
71  ldh, t, ldt, alphar, alphai, beta, q, ldq, z,
72  ldz, &work_query, lwork );
73  if( info != 0 ) {
74  goto exit_level_0;
75  }
76  lwork = (lapack_int)work_query;
77  /* Allocate memory for work arrays */
78  work = (float*)LAPACKE_malloc( sizeof(float) * lwork );
79  if( work == NULL ) {
81  goto exit_level_0;
82  }
83  /* Call middle-level interface */
84  info = LAPACKE_shgeqz_work( matrix_layout, job, compq, compz, n, ilo, ihi, h,
85  ldh, t, ldt, alphar, alphai, beta, q, ldq, z,
86  ldz, work, lwork );
87  /* Release memory and exit */
88  LAPACKE_free( work );
89 exit_level_0:
90  if( info == LAPACK_WORK_MEMORY_ERROR ) {
91  LAPACKE_xerbla( "LAPACKE_shgeqz", info );
92  }
93  return info;
94 }
#define LAPACK_ROW_MAJOR
Definition: lapacke.h:119
#define LAPACK_WORK_MEMORY_ERROR
Definition: lapacke.h:122
lapack_int LAPACKE_shgeqz_work(int matrix_layout, char job, char compq, char compz, lapack_int n, lapack_int ilo, lapack_int ihi, float *h, lapack_int ldh, float *t, lapack_int ldt, float *alphar, float *alphai, float *beta, float *q, lapack_int ldq, float *z, lapack_int ldz, float *work, lapack_int lwork)
#define LAPACKE_free(p)
Definition: lapacke.h:113
lapack_logical LAPACKE_sge_nancheck(int matrix_layout, lapack_int m, lapack_int n, const float *a, lapack_int lda)
#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
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