LAPACK  3.9.1
LAPACK: Linear Algebra PACKage

◆ LAPACKE_zgesvd_work()

lapack_int LAPACKE_zgesvd_work ( int  matrix_layout,
char  jobu,
char  jobvt,
lapack_int  m,
lapack_int  n,
lapack_complex_double *  a,
lapack_int  lda,
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 
)

Definition at line 35 of file lapacke_zgesvd_work.c.

42 {
43  lapack_int info = 0;
44  if( matrix_layout == LAPACK_COL_MAJOR ) {
45  /* Call LAPACK function and adjust info */
46  LAPACK_zgesvd( &jobu, &jobvt, &m, &n, a, &lda, s, u, &ldu, vt, &ldvt,
47  work, &lwork, rwork, &info );
48  if( info < 0 ) {
49  info = info - 1;
50  }
51  } else if( matrix_layout == LAPACK_ROW_MAJOR ) {
52  lapack_int nrows_u = ( LAPACKE_lsame( jobu, 'a' ) ||
53  LAPACKE_lsame( jobu, 's' ) ) ? m : 1;
54  lapack_int ncols_u = LAPACKE_lsame( jobu, 'a' ) ? m :
55  ( LAPACKE_lsame( jobu, 's' ) ? MIN(m,n) : 1);
56  lapack_int nrows_vt = LAPACKE_lsame( jobvt, 'a' ) ? n :
57  ( LAPACKE_lsame( jobvt, 's' ) ? MIN(m,n) : 1);
58  lapack_int lda_t = MAX(1,m);
59  lapack_int ldu_t = MAX(1,nrows_u);
60  lapack_int ldvt_t = MAX(1,nrows_vt);
61  lapack_complex_double* a_t = NULL;
62  lapack_complex_double* u_t = NULL;
63  lapack_complex_double* vt_t = NULL;
64  /* Check leading dimension(s) */
65  if( lda < n ) {
66  info = -7;
67  LAPACKE_xerbla( "LAPACKE_zgesvd_work", info );
68  return info;
69  }
70  if( ldu < ncols_u ) {
71  info = -10;
72  LAPACKE_xerbla( "LAPACKE_zgesvd_work", info );
73  return info;
74  }
75  if( ldvt < n ) {
76  info = -12;
77  LAPACKE_xerbla( "LAPACKE_zgesvd_work", info );
78  return info;
79  }
80  /* Query optimal working array(s) size if requested */
81  if( lwork == -1 ) {
82  LAPACK_zgesvd( &jobu, &jobvt, &m, &n, a, &lda_t, s, u, &ldu_t, vt,
83  &ldvt_t, work, &lwork, rwork, &info );
84  return (info < 0) ? (info - 1) : info;
85  }
86  /* Allocate memory for temporary array(s) */
87  a_t = (lapack_complex_double*)
88  LAPACKE_malloc( sizeof(lapack_complex_double) * lda_t * MAX(1,n) );
89  if( a_t == NULL ) {
90  info = LAPACK_TRANSPOSE_MEMORY_ERROR;
91  goto exit_level_0;
92  }
93  if( LAPACKE_lsame( jobu, 'a' ) || LAPACKE_lsame( jobu, 's' ) ) {
94  u_t = (lapack_complex_double*)
95  LAPACKE_malloc( sizeof(lapack_complex_double) *
96  ldu_t * MAX(1,ncols_u) );
97  if( u_t == NULL ) {
98  info = LAPACK_TRANSPOSE_MEMORY_ERROR;
99  goto exit_level_1;
100  }
101  }
102  if( LAPACKE_lsame( jobvt, 'a' ) || LAPACKE_lsame( jobvt, 's' ) ) {
103  vt_t = (lapack_complex_double*)
104  LAPACKE_malloc( sizeof(lapack_complex_double) *
105  ldvt_t * MAX(1,n) );
106  if( vt_t == NULL ) {
107  info = LAPACK_TRANSPOSE_MEMORY_ERROR;
108  goto exit_level_2;
109  }
110  }
111  /* Transpose input matrices */
112  LAPACKE_zge_trans( matrix_layout, m, n, a, lda, a_t, lda_t );
113  /* Call LAPACK function and adjust info */
114  LAPACK_zgesvd( &jobu, &jobvt, &m, &n, a_t, &lda_t, s, u_t, &ldu_t, vt_t,
115  &ldvt_t, work, &lwork, rwork, &info );
116  if( info < 0 ) {
117  info = info - 1;
118  }
119  /* Transpose output matrices */
120  LAPACKE_zge_trans( LAPACK_COL_MAJOR, m, n, a_t, lda_t, a, lda );
121  if( LAPACKE_lsame( jobu, 'a' ) || LAPACKE_lsame( jobu, 's' ) ) {
122  LAPACKE_zge_trans( LAPACK_COL_MAJOR, nrows_u, ncols_u, u_t, ldu_t,
123  u, ldu );
124  }
125  if( LAPACKE_lsame( jobvt, 'a' ) || LAPACKE_lsame( jobvt, 's' ) ) {
126  LAPACKE_zge_trans( LAPACK_COL_MAJOR, nrows_vt, n, vt_t, ldvt_t, vt,
127  ldvt );
128  }
129  /* Release memory and exit */
130  if( LAPACKE_lsame( jobvt, 'a' ) || LAPACKE_lsame( jobvt, 's' ) ) {
131  LAPACKE_free( vt_t );
132  }
133 exit_level_2:
134  if( LAPACKE_lsame( jobu, 'a' ) || LAPACKE_lsame( jobu, 's' ) ) {
135  LAPACKE_free( u_t );
136  }
137 exit_level_1:
138  LAPACKE_free( a_t );
139 exit_level_0:
140  if( info == LAPACK_TRANSPOSE_MEMORY_ERROR ) {
141  LAPACKE_xerbla( "LAPACKE_zgesvd_work", info );
142  }
143  } else {
144  info = -1;
145  LAPACKE_xerbla( "LAPACKE_zgesvd_work", info );
146  }
147  return info;
148 }
lapack_int
#define lapack_int
Definition: lapack.h:83
LAPACK_zgesvd
void LAPACK_zgesvd(char const *jobu, char const *jobvt, lapack_int const *m, lapack_int const *n, lapack_complex_double *A, lapack_int const *lda, double *S, lapack_complex_double *U, lapack_int const *ldu, lapack_complex_double *VT, lapack_int const *ldvt, lapack_complex_double *work, lapack_int const *lwork, double *rwork, lapack_int *info)
lapack_complex_double
#define lapack_complex_double
Definition: lapack.h:63
LAPACK_COL_MAJOR
#define LAPACK_COL_MAJOR
Definition: lapacke.h:53
LAPACKE_free
#define LAPACKE_free(p)
Definition: lapacke.h:46
LAPACK_ROW_MAJOR
#define LAPACK_ROW_MAJOR
Definition: lapacke.h:52
LAPACKE_malloc
#define LAPACKE_malloc(size)
Definition: lapacke.h:43
LAPACK_TRANSPOSE_MEMORY_ERROR
#define LAPACK_TRANSPOSE_MEMORY_ERROR
Definition: lapacke.h:56
LAPACKE_lsame
lapack_logical LAPACKE_lsame(char ca, char cb)
Definition: lapacke_lsame.c:35
LAPACKE_xerbla
void LAPACKE_xerbla(const char *name, lapack_int info)
Definition: lapacke_xerbla.c:36
LAPACKE_zge_trans
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)
Definition: lapacke_zge_trans.c:39
MIN
#define MIN(x, y)
Definition: lapacke_utils.h:49
MAX
#define MAX(x, y)
Definition: lapacke_utils.h:46
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