LAPACK  3.8.0
LAPACK: Linear Algebra PACKage

◆ LAPACKE_dsyevx_2stage_work()

lapack_int LAPACKE_dsyevx_2stage_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,
double *  work,
lapack_int  lwork,
lapack_int iwork,
lapack_int ifail 
)

Definition at line 36 of file lapacke_dsyevx_2stage_work.c.

43 {
44  lapack_int info = 0;
45  if( matrix_layout == LAPACK_COL_MAJOR ) {
46  /* Call LAPACK function and adjust info */
47  LAPACK_dsyevx_2stage( &jobz, &range, &uplo, &n, a, &lda, &vl, &vu, &il, &iu,
48  &abstol, m, w, z, &ldz, work, &lwork, iwork, ifail,
49  &info );
50  if( info < 0 ) {
51  info = info - 1;
52  }
53  } else if( matrix_layout == LAPACK_ROW_MAJOR ) {
54  lapack_int ncols_z = ( LAPACKE_lsame( range, 'a' ) ||
55  LAPACKE_lsame( range, 'v' ) ) ? n :
56  ( LAPACKE_lsame( range, 'i' ) ? (iu-il+1) : 1);
57  lapack_int lda_t = MAX(1,n);
58  lapack_int ldz_t = MAX(1,n);
59  double* a_t = NULL;
60  double* z_t = NULL;
61  /* Check leading dimension(s) */
62  if( lda < n ) {
63  info = -7;
64  LAPACKE_xerbla( "LAPACKE_dsyevx_2stage_work", info );
65  return info;
66  }
67  if( ldz < ncols_z ) {
68  info = -16;
69  LAPACKE_xerbla( "LAPACKE_dsyevx_2stage_work", info );
70  return info;
71  }
72  /* Query optimal working array(s) size if requested */
73  if( lwork == -1 ) {
74  LAPACK_dsyevx_2stage( &jobz, &range, &uplo, &n, a, &lda_t, &vl, &vu, &il,
75  &iu, &abstol, m, w, z, &ldz_t, work, &lwork, iwork,
76  ifail, &info );
77  return (info < 0) ? (info - 1) : info;
78  }
79  /* Allocate memory for temporary array(s) */
80  a_t = (double*)LAPACKE_malloc( sizeof(double) * lda_t * MAX(1,n) );
81  if( a_t == NULL ) {
83  goto exit_level_0;
84  }
85  if( LAPACKE_lsame( jobz, 'v' ) ) {
86  z_t = (double*)
87  LAPACKE_malloc( sizeof(double) * ldz_t * MAX(1,ncols_z) );
88  if( z_t == NULL ) {
90  goto exit_level_1;
91  }
92  }
93  /* Transpose input matrices */
94  LAPACKE_dsy_trans( matrix_layout, uplo, n, a, lda, a_t, lda_t );
95  /* Call LAPACK function and adjust info */
96  LAPACK_dsyevx_2stage( &jobz, &range, &uplo, &n, a_t, &lda_t, &vl, &vu, &il,
97  &iu, &abstol, m, w, z_t, &ldz_t, work, &lwork, iwork,
98  ifail, &info );
99  if( info < 0 ) {
100  info = info - 1;
101  }
102  /* Transpose output matrices */
103  LAPACKE_dsy_trans( LAPACK_COL_MAJOR, uplo, n, a_t, lda_t, a, lda );
104  if( LAPACKE_lsame( jobz, 'v' ) ) {
105  LAPACKE_dge_trans( LAPACK_COL_MAJOR, n, ncols_z, z_t, ldz_t, z,
106  ldz );
107  }
108  /* Release memory and exit */
109  if( LAPACKE_lsame( jobz, 'v' ) ) {
110  LAPACKE_free( z_t );
111  }
112 exit_level_1:
113  LAPACKE_free( a_t );
114 exit_level_0:
115  if( info == LAPACK_TRANSPOSE_MEMORY_ERROR ) {
116  LAPACKE_xerbla( "LAPACKE_dsyevx_2stage_work", info );
117  }
118  } else {
119  info = -1;
120  LAPACKE_xerbla( "LAPACKE_dsyevx_2stage_work", info );
121  }
122  return info;
123 }
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
#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
void LAPACK_dsyevx_2stage(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, double *work, lapack_int *lwork, lapack_int *iwork, lapack_int *ifail, lapack_int *info)
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