LAPACK  3.7.1
LAPACK: Linear Algebra PACKage

◆ LAPACKE_dsyevr_work()

lapack_int LAPACKE_dsyevr_work ( int  matrix_layout,
char  jobz,
char  range,
char  uplo,
lapack_int  n,
double *  a,
lapack_int  lda,
double  vl,
double  vu,
lapack_int  il,
lapack_int  iu,
double  abstol,
lapack_int m,
double *  w,
double *  z,
lapack_int  ldz,
lapack_int isuppz,
double *  work,
lapack_int  lwork,
lapack_int iwork,
lapack_int  liwork 
)

Definition at line 36 of file lapacke_dsyevr_work.c.

44 {
45  lapack_int info = 0;
46  if( matrix_layout == LAPACK_COL_MAJOR ) {
47  /* Call LAPACK function and adjust info */
48  LAPACK_dsyevr( &jobz, &range, &uplo, &n, a, &lda, &vl, &vu, &il, &iu,
49  &abstol, m, w, z, &ldz, isuppz, work, &lwork, iwork,
50  &liwork, &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( jobz, 'v' ) ) ? 1 :
56  ( LAPACKE_lsame( range, 'a' ) ||
57  LAPACKE_lsame( range, 'v' ) ) ? n :
58  ( LAPACKE_lsame( range, 'i' ) ? (iu-il+1) : 1);
59  lapack_int lda_t = MAX(1,n);
60  lapack_int ldz_t = MAX(1,n);
61  double* a_t = NULL;
62  double* z_t = NULL;
63  /* Check leading dimension(s) */
64  if( lda < n ) {
65  info = -7;
66  LAPACKE_xerbla( "LAPACKE_dsyevr_work", info );
67  return info;
68  }
69  if( ldz < ncols_z ) {
70  info = -16;
71  LAPACKE_xerbla( "LAPACKE_dsyevr_work", info );
72  return info;
73  }
74  /* Query optimal working array(s) size if requested */
75  if( liwork == -1 || lwork == -1 ) {
76  LAPACK_dsyevr( &jobz, &range, &uplo, &n, a, &lda_t, &vl, &vu, &il,
77  &iu, &abstol, m, w, z, &ldz_t, isuppz, work, &lwork,
78  iwork, &liwork, &info );
79  return (info < 0) ? (info - 1) : info;
80  }
81  /* Allocate memory for temporary array(s) */
82  a_t = (double*)LAPACKE_malloc( sizeof(double) * lda_t * MAX(1,n) );
83  if( a_t == NULL ) {
85  goto exit_level_0;
86  }
87  if( LAPACKE_lsame( jobz, 'v' ) ) {
88  z_t = (double*)
89  LAPACKE_malloc( sizeof(double) * ldz_t * MAX(1,ncols_z) );
90  if( z_t == NULL ) {
92  goto exit_level_1;
93  }
94  }
95  /* Transpose input matrices */
96  LAPACKE_dsy_trans( matrix_layout, uplo, n, a, lda, a_t, lda_t );
97  /* Call LAPACK function and adjust info */
98  LAPACK_dsyevr( &jobz, &range, &uplo, &n, a_t, &lda_t, &vl, &vu, &il,
99  &iu, &abstol, m, w, z_t, &ldz_t, isuppz, work, &lwork,
100  iwork, &liwork, &info );
101  if( info < 0 ) {
102  info = info - 1;
103  }
104  /* Transpose output matrices */
105  LAPACKE_dsy_trans( LAPACK_COL_MAJOR, uplo, n, a_t, lda_t, a, lda );
106  if( LAPACKE_lsame( jobz, 'v' ) ) {
107  LAPACKE_dge_trans( LAPACK_COL_MAJOR, n, ncols_z, z_t, ldz_t, z,
108  ldz );
109  }
110  /* Release memory and exit */
111  if( LAPACKE_lsame( jobz, 'v' ) ) {
112  LAPACKE_free( z_t );
113  }
114 exit_level_1:
115  LAPACKE_free( a_t );
116 exit_level_0:
117  if( info == LAPACK_TRANSPOSE_MEMORY_ERROR ) {
118  LAPACKE_xerbla( "LAPACKE_dsyevr_work", info );
119  }
120  } else {
121  info = -1;
122  LAPACKE_xerbla( "LAPACKE_dsyevr_work", info );
123  }
124  return info;
125 }
void LAPACKE_dge_trans(int matrix_layout, lapack_int m, lapack_int n, const double *in, lapack_int ldin, double *out, lapack_int ldout)
void LAPACK_dsyevr(char *jobz, char *range, char *uplo, lapack_int *n, double *a, lapack_int *lda, double *vl, double *vu, lapack_int *il, lapack_int *iu, double *abstol, lapack_int *m, double *w, double *z, lapack_int *ldz, lapack_int *isuppz, double *work, lapack_int *lwork, lapack_int *iwork, lapack_int *liwork, lapack_int *info)
#define LAPACK_ROW_MAJOR
Definition: lapacke.h:119
#define LAPACKE_free(p)
Definition: lapacke.h:113
#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
void LAPACKE_dsy_trans(int matrix_layout, char uplo, lapack_int n, const double *in, lapack_int ldin, double *out, lapack_int ldout)
#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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