LAPACK  3.10.0
LAPACK: Linear Algebra PACKage

◆ LAPACKE_zgesvdx_work()

lapack_int LAPACKE_zgesvdx_work ( int  matrix_layout,
char  jobu,
char  jobvt,
char  range,
lapack_int  m,
lapack_int  n,
lapack_complex_double a,
lapack_int  lda,
double  vl,
double  vu,
lapack_int  il,
lapack_int  iu,
lapack_int ns,
double *  s,
lapack_complex_double u,
lapack_int  ldu,
lapack_complex_double vt,
lapack_int  ldvt,
lapack_complex_double work,
lapack_int  lwork,
double *  rwork,
lapack_int iwork 
)

Definition at line 35 of file lapacke_zgesvdx_work.c.

43 {
44  lapack_int info = 0;
45  if( matrix_layout == LAPACK_COL_MAJOR ) {
46  /* Call LAPACK function and adjust info */
47  LAPACK_zgesvdx( &jobu, &jobvt, &range, &m, &n, a, &lda, &vl, &vu,
48  &il, &iu, ns, s, u, &ldu, vt, &ldvt,
49  work, &lwork, rwork, iwork, &info );
50  if( info < 0 ) {
51  info = info - 1;
52  }
53  } else if( matrix_layout == LAPACK_ROW_MAJOR ) {
54  lapack_int nrows_u = LAPACKE_lsame( jobu, 'v' ) ? m : 0;
55  lapack_int ncols_u = LAPACKE_lsame( jobu, 'v' ) ?
56  ( LAPACKE_lsame( range, 'i' ) ? MAX(iu - il + 1, 0) : MIN(m,n)) : 0;
57  lapack_int nrows_vt = LAPACKE_lsame( jobvt, 'v' ) ?
58  ( LAPACKE_lsame( range, 'i' ) ? MAX(iu - il + 1, 0) : MIN(m,n)) : 0;
59  lapack_int ncols_vt = LAPACKE_lsame( jobvt, 'v' ) ? n : 0;
60 
61  lapack_int lda_t = MAX(1,m);
62  lapack_int ldu_t = MAX(1,nrows_u);
63  lapack_int ldvt_t = MAX(1,nrows_vt);
64 
65  lapack_complex_double* a_t = NULL;
66  lapack_complex_double* u_t = NULL;
67  lapack_complex_double* vt_t = NULL;
68  /* Check leading dimension(s) */
69  if( lda < n ) {
70  info = -8;
71  LAPACKE_xerbla( "LAPACKE_zgesvdx_work", info );
72  return info;
73  }
74  if( ldu < ncols_u ) {
75  info = -16;
76  LAPACKE_xerbla( "LAPACKE_zgesvdx_work", info );
77  return info;
78  }
79  if( ldvt < ncols_vt ) {
80  info = -18;
81  LAPACKE_xerbla( "LAPACKE_zgesvdx_work", info );
82  return info;
83  }
84  /* Query optimal working array(s) size if requested */
85  if( lwork == -1 ) {
86  LAPACK_zgesvdx( &jobu, &jobvt, &range, &m, &n, a, &lda_t, &vl, &vu,
87  &il, &iu, ns, s, u, &ldu_t, vt,
88  &ldvt_t, work, &lwork, rwork, iwork, &info );
89  return (info < 0) ? (info - 1) : info;
90  }
91  /* Allocate memory for temporary array(s) */
92  a_t = (lapack_complex_double*)
93  LAPACKE_malloc( sizeof(lapack_complex_double) * lda_t * MAX(1,n) );
94  if( a_t == NULL ) {
96  goto exit_level_0;
97  }
98  if( LAPACKE_lsame( jobu, 'v' ) ) {
99  u_t = (lapack_complex_double*)
100  LAPACKE_malloc( sizeof(lapack_complex_double) * ldu_t * MAX(1,ncols_u) );
101  if( u_t == NULL ) {
103  goto exit_level_1;
104  }
105  }
106  if( LAPACKE_lsame( jobvt, 'v' ) ) {
107  vt_t = (lapack_complex_double*)
108  LAPACKE_malloc( sizeof(lapack_complex_double) * ldvt_t * MAX(1,n) );
109  if( vt_t == NULL ) {
111  goto exit_level_2;
112  }
113  }
114  /* Transpose input matrices */
115  LAPACKE_zge_trans( matrix_layout, m, n, a, lda, a_t, lda_t );
116  /* Call LAPACK function and adjust info */
117  LAPACK_zgesvdx( &jobu, &jobvt, &range, &m, &n, a_t, &lda_t, &vl, &vu,
118  &il, &iu, ns, s, u_t, &ldu_t, vt_t,
119  &ldvt_t, work, &lwork, rwork, iwork, &info );
120  if( info < 0 ) {
121  info = info - 1;
122  }
123  /* Transpose output matrices */
124  LAPACKE_zge_trans( LAPACK_COL_MAJOR, m, n, a_t, lda_t, a, lda );
125  if( LAPACKE_lsame( jobu, 'v' ) ) {
126  LAPACKE_zge_trans( LAPACK_COL_MAJOR, nrows_u, ncols_u, u_t, ldu_t,
127  u, ldu );
128  }
129  if( LAPACKE_lsame( jobvt, 'v' ) ) {
130  LAPACKE_zge_trans( LAPACK_COL_MAJOR, nrows_vt, n, vt_t, ldvt_t, vt,
131  ldvt );
132  }
133  /* Release memory and exit */
134  if( LAPACKE_lsame( jobvt, 'v' ) ) {
135  LAPACKE_free( vt_t );
136  }
137 exit_level_2:
138  if( LAPACKE_lsame( jobu, 'v' ) ) {
139  LAPACKE_free( u_t );
140  }
141 exit_level_1:
142  LAPACKE_free( a_t );
143 exit_level_0:
144  if( info == LAPACK_TRANSPOSE_MEMORY_ERROR ) {
145  LAPACKE_xerbla( "LAPACKE_zgesvdx_work", info );
146  }
147  } else {
148  info = -1;
149  LAPACKE_xerbla( "LAPACKE_zgesvdx_work", info );
150  }
151  return info;
152 }
#define LAPACK_zgesvdx(...)
Definition: lapack.h:3615
#define lapack_int
Definition: lapack.h:83
#define lapack_complex_double
Definition: lapack.h:63
#define LAPACK_COL_MAJOR
Definition: lapacke.h:53
#define LAPACKE_free(p)
Definition: lapacke.h:46
#define LAPACK_ROW_MAJOR
Definition: lapacke.h:52
#define LAPACKE_malloc(size)
Definition: lapacke.h:43
#define LAPACK_TRANSPOSE_MEMORY_ERROR
Definition: lapacke.h:56
lapack_logical LAPACKE_lsame(char ca, char cb)
Definition: lapacke_lsame.c:35
void LAPACKE_xerbla(const char *name, lapack_int info)
void LAPACKE_zge_trans(int matrix_layout, lapack_int m, lapack_int n, const lapack_complex_double *in, lapack_int ldin, lapack_complex_double *out, lapack_int ldout)
#define MIN(x, y)
Definition: lapacke_utils.h:49
#define MAX(x, y)
Definition: lapacke_utils.h:46
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