LAPACK  3.8.0
LAPACK: Linear Algebra PACKage

◆ LAPACKE_dsbevx_work()

lapack_int LAPACKE_dsbevx_work ( int  matrix_layout,
char  jobz,
char  range,
char  uplo,
lapack_int  n,
lapack_int  kd,
double *  ab,
lapack_int  ldab,
double *  q,
lapack_int  ldq,
double  vl,
double  vu,
lapack_int  il,
lapack_int  iu,
double  abstol,
lapack_int m,
double *  w,
double *  z,
lapack_int  ldz,
double *  work,
lapack_int iwork,
lapack_int ifail 
)

Definition at line 36 of file lapacke_dsbevx_work.c.

44 {
45  lapack_int info = 0;
46  if( matrix_layout == LAPACK_COL_MAJOR ) {
47  /* Call LAPACK function and adjust info */
48  LAPACK_dsbevx( &jobz, &range, &uplo, &n, &kd, ab, &ldab, q, &ldq, &vl,
49  &vu, &il, &iu, &abstol, m, w, z, &ldz, work, iwork,
50  ifail, &info );
51  if( info < 0 ) {
52  info = info - 1;
53  }
54  } else if( matrix_layout == LAPACK_ROW_MAJOR ) {
55  lapack_int ncols_z = ( LAPACKE_lsame( range, 'a' ) ||
56  LAPACKE_lsame( range, 'v' ) ) ? n :
57  ( LAPACKE_lsame( range, 'i' ) ? (iu-il+1) : 1);
58  lapack_int ldab_t = MAX(1,kd+1);
59  lapack_int ldq_t = MAX(1,n);
60  lapack_int ldz_t = MAX(1,n);
61  double* ab_t = NULL;
62  double* q_t = NULL;
63  double* z_t = NULL;
64  /* Check leading dimension(s) */
65  if( ldab < n ) {
66  info = -8;
67  LAPACKE_xerbla( "LAPACKE_dsbevx_work", info );
68  return info;
69  }
70  if( ldq < n ) {
71  info = -10;
72  LAPACKE_xerbla( "LAPACKE_dsbevx_work", info );
73  return info;
74  }
75  if( ldz < ncols_z ) {
76  info = -19;
77  LAPACKE_xerbla( "LAPACKE_dsbevx_work", info );
78  return info;
79  }
80  /* Allocate memory for temporary array(s) */
81  ab_t = (double*)LAPACKE_malloc( sizeof(double) * ldab_t * MAX(1,n) );
82  if( ab_t == NULL ) {
84  goto exit_level_0;
85  }
86  if( LAPACKE_lsame( jobz, 'v' ) ) {
87  q_t = (double*)LAPACKE_malloc( sizeof(double) * ldq_t * MAX(1,n) );
88  if( q_t == NULL ) {
90  goto exit_level_1;
91  }
92  }
93  if( LAPACKE_lsame( jobz, 'v' ) ) {
94  z_t = (double*)
95  LAPACKE_malloc( sizeof(double) * ldz_t * MAX(1,ncols_z) );
96  if( z_t == NULL ) {
98  goto exit_level_2;
99  }
100  }
101  /* Transpose input matrices */
102  LAPACKE_dsb_trans( matrix_layout, uplo, n, kd, ab, ldab, ab_t, ldab_t );
103  /* Call LAPACK function and adjust info */
104  LAPACK_dsbevx( &jobz, &range, &uplo, &n, &kd, ab_t, &ldab_t, q_t,
105  &ldq_t, &vl, &vu, &il, &iu, &abstol, m, w, z_t, &ldz_t,
106  work, iwork, ifail, &info );
107  if( info < 0 ) {
108  info = info - 1;
109  }
110  /* Transpose output matrices */
111  LAPACKE_dsb_trans( LAPACK_COL_MAJOR, uplo, n, kd, ab_t, ldab_t, ab,
112  ldab );
113  if( LAPACKE_lsame( jobz, 'v' ) ) {
114  LAPACKE_dge_trans( LAPACK_COL_MAJOR, n, n, q_t, ldq_t, q, ldq );
115  }
116  if( LAPACKE_lsame( jobz, 'v' ) ) {
117  LAPACKE_dge_trans( LAPACK_COL_MAJOR, n, ncols_z, z_t, ldz_t, z,
118  ldz );
119  }
120  /* Release memory and exit */
121  if( LAPACKE_lsame( jobz, 'v' ) ) {
122  LAPACKE_free( z_t );
123  }
124 exit_level_2:
125  if( LAPACKE_lsame( jobz, 'v' ) ) {
126  LAPACKE_free( q_t );
127  }
128 exit_level_1:
129  LAPACKE_free( ab_t );
130 exit_level_0:
131  if( info == LAPACK_TRANSPOSE_MEMORY_ERROR ) {
132  LAPACKE_xerbla( "LAPACKE_dsbevx_work", info );
133  }
134  } else {
135  info = -1;
136  LAPACKE_xerbla( "LAPACKE_dsbevx_work", info );
137  }
138  return info;
139 }
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 LAPACKE_dsb_trans(int matrix_layout, char uplo, lapack_int n, lapack_int kd, const double *in, lapack_int ldin, double *out, lapack_int ldout)
#define MAX(x, y)
Definition: lapacke_utils.h:47
void LAPACK_dsbevx(char *jobz, char *range, char *uplo, lapack_int *n, lapack_int *kd, double *ab, lapack_int *ldab, double *q, lapack_int *ldq, double *vl, double *vu, lapack_int *il, lapack_int *iu, double *abstol, lapack_int *m, double *w, double *z, lapack_int *ldz, double *work, lapack_int *iwork, lapack_int *ifail, 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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