LAPACK  3.10.1
LAPACK: Linear Algebra PACKage

◆ LAPACKE_dgesvd_work()

lapack_int LAPACKE_dgesvd_work ( int  matrix_layout,
char  jobu,
char  jobvt,
lapack_int  m,
lapack_int  n,
double *  a,
lapack_int  lda,
double *  s,
double *  u,
lapack_int  ldu,
double *  vt,
lapack_int  ldvt,
double *  work,
lapack_int  lwork 
)

Definition at line 35 of file lapacke_dgesvd_work.c.

40 {
41  lapack_int info = 0;
42  if( matrix_layout == LAPACK_COL_MAJOR ) {
43  /* Call LAPACK function and adjust info */
44  LAPACK_dgesvd( &jobu, &jobvt, &m, &n, a, &lda, s, u, &ldu, vt, &ldvt,
45  work, &lwork, &info );
46  if( info < 0 ) {
47  info = info - 1;
48  }
49  } else if( matrix_layout == LAPACK_ROW_MAJOR ) {
50  lapack_int nrows_u = ( LAPACKE_lsame( jobu, 'a' ) ||
51  LAPACKE_lsame( jobu, 's' ) ) ? m : 1;
52  lapack_int ncols_u = LAPACKE_lsame( jobu, 'a' ) ? m :
53  ( LAPACKE_lsame( jobu, 's' ) ? MIN(m,n) : 1);
54  lapack_int nrows_vt = LAPACKE_lsame( jobvt, 'a' ) ? n :
55  ( LAPACKE_lsame( jobvt, 's' ) ? MIN(m,n) : 1);
56  lapack_int ncols_vt = ( LAPACKE_lsame( jobvt, 'a' ) ||
57  LAPACKE_lsame( jobvt, 's' ) ) ? 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  double* a_t = NULL;
62  double* u_t = NULL;
63  double* vt_t = NULL;
64  /* Check leading dimension(s) */
65  if( lda < n ) {
66  info = -7;
67  LAPACKE_xerbla( "LAPACKE_dgesvd_work", info );
68  return info;
69  }
70  if( ldu < ncols_u ) {
71  info = -10;
72  LAPACKE_xerbla( "LAPACKE_dgesvd_work", info );
73  return info;
74  }
75  if( ldvt < ncols_vt ) {
76  info = -12;
77  LAPACKE_xerbla( "LAPACKE_dgesvd_work", info );
78  return info;
79  }
80  /* Query optimal working array(s) size if requested */
81  if( lwork == -1 ) {
82  LAPACK_dgesvd( &jobu, &jobvt, &m, &n, a, &lda_t, s, u, &ldu_t, vt,
83  &ldvt_t, work, &lwork, &info );
84  return (info < 0) ? (info - 1) : info;
85  }
86  /* Allocate memory for temporary array(s) */
87  a_t = (double*)LAPACKE_malloc( sizeof(double) * lda_t * MAX(1,n) );
88  if( a_t == NULL ) {
90  goto exit_level_0;
91  }
92  if( LAPACKE_lsame( jobu, 'a' ) || LAPACKE_lsame( jobu, 's' ) ) {
93  u_t = (double*)
94  LAPACKE_malloc( sizeof(double) * ldu_t * MAX(1,ncols_u) );
95  if( u_t == NULL ) {
97  goto exit_level_1;
98  }
99  }
100  if( LAPACKE_lsame( jobvt, 'a' ) || LAPACKE_lsame( jobvt, 's' ) ) {
101  vt_t = (double*)
102  LAPACKE_malloc( sizeof(double) * ldvt_t * MAX(1,n) );
103  if( vt_t == NULL ) {
105  goto exit_level_2;
106  }
107  }
108  /* Transpose input matrices */
109  LAPACKE_dge_trans( matrix_layout, m, n, a, lda, a_t, lda_t );
110  /* Call LAPACK function and adjust info */
111  LAPACK_dgesvd( &jobu, &jobvt, &m, &n, a_t, &lda_t, s, u_t, &ldu_t, vt_t,
112  &ldvt_t, work, &lwork, &info );
113  if( info < 0 ) {
114  info = info - 1;
115  }
116  /* Transpose output matrices */
117  LAPACKE_dge_trans( LAPACK_COL_MAJOR, m, n, a_t, lda_t, a, lda );
118  if( LAPACKE_lsame( jobu, 'a' ) || LAPACKE_lsame( jobu, 's' ) ) {
119  LAPACKE_dge_trans( LAPACK_COL_MAJOR, nrows_u, ncols_u, u_t, ldu_t,
120  u, ldu );
121  }
122  if( LAPACKE_lsame( jobvt, 'a' ) || LAPACKE_lsame( jobvt, 's' ) ) {
123  LAPACKE_dge_trans( LAPACK_COL_MAJOR, nrows_vt, n, vt_t, ldvt_t, vt,
124  ldvt );
125  }
126  /* Release memory and exit */
127  if( LAPACKE_lsame( jobvt, 'a' ) || LAPACKE_lsame( jobvt, 's' ) ) {
128  LAPACKE_free( vt_t );
129  }
130 exit_level_2:
131  if( LAPACKE_lsame( jobu, 'a' ) || LAPACKE_lsame( jobu, 's' ) ) {
132  LAPACKE_free( u_t );
133  }
134 exit_level_1:
135  LAPACKE_free( a_t );
136 exit_level_0:
137  if( info == LAPACK_TRANSPOSE_MEMORY_ERROR ) {
138  LAPACKE_xerbla( "LAPACKE_dgesvd_work", info );
139  }
140  } else {
141  info = -1;
142  LAPACKE_xerbla( "LAPACKE_dgesvd_work", info );
143  }
144  return info;
145 }
#define LAPACK_dgesvd(...)
Definition: lapack.h:3391
#define lapack_int
Definition: lapack.h:83
#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)
#define MIN(x, y)
Definition: lapacke_utils.h:49
#define MAX(x, y)
Definition: lapacke_utils.h:46
void LAPACKE_dge_trans(int matrix_layout, lapack_int m, lapack_int n, const double *in, lapack_int ldin, double *out, lapack_int ldout)
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