LAPACK  3.10.1
LAPACK: Linear Algebra PACKage

◆ LAPACKE_cgesvd_work()

lapack_int LAPACKE_cgesvd_work ( int  matrix_layout,
char  jobu,
char  jobvt,
lapack_int  m,
lapack_int  n,
lapack_complex_float a,
lapack_int  lda,
float *  s,
lapack_complex_float u,
lapack_int  ldu,
lapack_complex_float vt,
lapack_int  ldvt,
lapack_complex_float work,
lapack_int  lwork,
float *  rwork 
)

Definition at line 35 of file lapacke_cgesvd_work.c.

42 {
43  lapack_int info = 0;
44  if( matrix_layout == LAPACK_COL_MAJOR ) {
45  /* Call LAPACK function and adjust info */
46  LAPACK_cgesvd( &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 ncols_vt = ( LAPACKE_lsame( jobvt, 'a' ) ||
59  LAPACKE_lsame( jobvt, 's' ) ) ? n : 1;
60  lapack_int lda_t = MAX(1,m);
61  lapack_int ldu_t = MAX(1,nrows_u);
62  lapack_int ldvt_t = MAX(1,nrows_vt);
63  lapack_complex_float* a_t = NULL;
64  lapack_complex_float* u_t = NULL;
65  lapack_complex_float* vt_t = NULL;
66  /* Check leading dimension(s) */
67  if( lda < n ) {
68  info = -7;
69  LAPACKE_xerbla( "LAPACKE_cgesvd_work", info );
70  return info;
71  }
72  if( ldu < ncols_u ) {
73  info = -10;
74  LAPACKE_xerbla( "LAPACKE_cgesvd_work", info );
75  return info;
76  }
77  if( ldvt < ncols_vt ) {
78  info = -12;
79  LAPACKE_xerbla( "LAPACKE_cgesvd_work", info );
80  return info;
81  }
82  /* Query optimal working array(s) size if requested */
83  if( lwork == -1 ) {
84  LAPACK_cgesvd( &jobu, &jobvt, &m, &n, a, &lda_t, s, u, &ldu_t, vt,
85  &ldvt_t, work, &lwork, rwork, &info );
86  return (info < 0) ? (info - 1) : info;
87  }
88  /* Allocate memory for temporary array(s) */
89  a_t = (lapack_complex_float*)
90  LAPACKE_malloc( sizeof(lapack_complex_float) * lda_t * MAX(1,n) );
91  if( a_t == NULL ) {
93  goto exit_level_0;
94  }
95  if( LAPACKE_lsame( jobu, 'a' ) || LAPACKE_lsame( jobu, 's' ) ) {
96  u_t = (lapack_complex_float*)
98  ldu_t * MAX(1,ncols_u) );
99  if( u_t == NULL ) {
101  goto exit_level_1;
102  }
103  }
104  if( LAPACKE_lsame( jobvt, 'a' ) || LAPACKE_lsame( jobvt, 's' ) ) {
105  vt_t = (lapack_complex_float*)
107  ldvt_t * MAX(1,n) );
108  if( vt_t == NULL ) {
110  goto exit_level_2;
111  }
112  }
113  /* Transpose input matrices */
114  LAPACKE_cge_trans( matrix_layout, m, n, a, lda, a_t, lda_t );
115  /* Call LAPACK function and adjust info */
116  LAPACK_cgesvd( &jobu, &jobvt, &m, &n, a_t, &lda_t, s, u_t, &ldu_t, vt_t,
117  &ldvt_t, work, &lwork, rwork, &info );
118  if( info < 0 ) {
119  info = info - 1;
120  }
121  /* Transpose output matrices */
122  LAPACKE_cge_trans( LAPACK_COL_MAJOR, m, n, a_t, lda_t, a, lda );
123  if( LAPACKE_lsame( jobu, 'a' ) || LAPACKE_lsame( jobu, 's' ) ) {
124  LAPACKE_cge_trans( LAPACK_COL_MAJOR, nrows_u, ncols_u, u_t, ldu_t,
125  u, ldu );
126  }
127  if( LAPACKE_lsame( jobvt, 'a' ) || LAPACKE_lsame( jobvt, 's' ) ) {
128  LAPACKE_cge_trans( LAPACK_COL_MAJOR, nrows_vt, n, vt_t, ldvt_t, vt,
129  ldvt );
130  }
131  /* Release memory and exit */
132  if( LAPACKE_lsame( jobvt, 'a' ) || LAPACKE_lsame( jobvt, 's' ) ) {
133  LAPACKE_free( vt_t );
134  }
135 exit_level_2:
136  if( LAPACKE_lsame( jobu, 'a' ) || LAPACKE_lsame( jobu, 's' ) ) {
137  LAPACKE_free( u_t );
138  }
139 exit_level_1:
140  LAPACKE_free( a_t );
141 exit_level_0:
142  if( info == LAPACK_TRANSPOSE_MEMORY_ERROR ) {
143  LAPACKE_xerbla( "LAPACKE_cgesvd_work", info );
144  }
145  } else {
146  info = -1;
147  LAPACKE_xerbla( "LAPACKE_cgesvd_work", info );
148  }
149  return info;
150 }
#define LAPACK_cgesvd(...)
Definition: lapack.h:3371
#define lapack_int
Definition: lapack.h:83
#define lapack_complex_float
Definition: lapack.h:45
#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_cge_trans(int matrix_layout, lapack_int m, lapack_int n, const lapack_complex_float *in, lapack_int ldin, lapack_complex_float *out, lapack_int ldout)
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