LAPACK  3.7.1
LAPACK: Linear Algebra PACKage

◆ LAPACKE_zgesdd_work()

lapack_int LAPACKE_zgesdd_work ( int  matrix_layout,
char  jobz,
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,
lapack_int iwork 
)

Definition at line 36 of file lapacke_zgesdd_work.c.

43 {
44  lapack_int info = 0;
45  if( matrix_layout == LAPACK_COL_MAJOR ) {
46  /* Call LAPACK function and adjust info */
47  LAPACK_zgesdd( &jobz, &m, &n, a, &lda, s, u, &ldu, vt, &ldvt, work,
48  &lwork, rwork, iwork, &info );
49  if( info < 0 ) {
50  info = info - 1;
51  }
52  } else if( matrix_layout == LAPACK_ROW_MAJOR ) {
53  lapack_int nrows_u = ( LAPACKE_lsame( jobz, 'a' ) ||
54  LAPACKE_lsame( jobz, 's' ) ||
55  ( LAPACKE_lsame( jobz, 'o' ) && m<n) ) ? m : 1;
56  lapack_int ncols_u = ( LAPACKE_lsame( jobz, 'a' ) ||
57  ( LAPACKE_lsame( jobz, 'o' ) && m<n) ) ? m :
58  ( LAPACKE_lsame( jobz, 's' ) ? MIN(m,n) : 1);
59  lapack_int nrows_vt = ( LAPACKE_lsame( jobz, 'a' ) ||
60  ( LAPACKE_lsame( jobz, 'o' ) && m>=n) ) ? n :
61  ( LAPACKE_lsame( jobz, 's' ) ? MIN(m,n) : 1);
62  lapack_int lda_t = MAX(1,m);
63  lapack_int ldu_t = MAX(1,nrows_u);
64  lapack_int ldvt_t = MAX(1,nrows_vt);
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 = -6;
71  LAPACKE_xerbla( "LAPACKE_zgesdd_work", info );
72  return info;
73  }
74  if( ldu < ncols_u ) {
75  info = -9;
76  LAPACKE_xerbla( "LAPACKE_zgesdd_work", info );
77  return info;
78  }
79  if( ldvt < n ) {
80  info = -11;
81  LAPACKE_xerbla( "LAPACKE_zgesdd_work", info );
82  return info;
83  }
84  /* Query optimal working array(s) size if requested */
85  if( lwork == -1 ) {
86  LAPACK_zgesdd( &jobz, &m, &n, a, &lda_t, s, u, &ldu_t, vt, &ldvt_t,
87  work, &lwork, rwork, iwork, &info );
88  return (info < 0) ? (info - 1) : info;
89  }
90  /* Allocate memory for temporary array(s) */
91  a_t = (lapack_complex_double*)
92  LAPACKE_malloc( sizeof(lapack_complex_double) * lda_t * MAX(1,n) );
93  if( a_t == NULL ) {
95  goto exit_level_0;
96  }
97  if( LAPACKE_lsame( jobz, 'a' ) || LAPACKE_lsame( jobz, 's' ) ||
98  ( LAPACKE_lsame( jobz, 'o' ) && (m<n) ) ) {
99  u_t = (lapack_complex_double*)
101  ldu_t * MAX(1,ncols_u) );
102  if( u_t == NULL ) {
104  goto exit_level_1;
105  }
106  }
107  if( LAPACKE_lsame( jobz, 'a' ) || LAPACKE_lsame( jobz, 's' ) ||
108  ( LAPACKE_lsame( jobz, 'o' ) && (m>=n) ) ) {
109  vt_t = (lapack_complex_double*)
111  ldvt_t * MAX(1,n) );
112  if( vt_t == NULL ) {
114  goto exit_level_2;
115  }
116  }
117  /* Transpose input matrices */
118  LAPACKE_zge_trans( matrix_layout, m, n, a, lda, a_t, lda_t );
119  /* Call LAPACK function and adjust info */
120  LAPACK_zgesdd( &jobz, &m, &n, a_t, &lda_t, s, u_t, &ldu_t, vt_t,
121  &ldvt_t, work, &lwork, rwork, iwork, &info );
122  if( info < 0 ) {
123  info = info - 1;
124  }
125  /* Transpose output matrices */
126  LAPACKE_zge_trans( LAPACK_COL_MAJOR, m, n, a_t, lda_t, a, lda );
127  if( LAPACKE_lsame( jobz, 'a' ) || LAPACKE_lsame( jobz, 's' ) ||
128  ( LAPACKE_lsame( jobz, 'o' ) && (m<n) ) ) {
129  LAPACKE_zge_trans( LAPACK_COL_MAJOR, nrows_u, ncols_u, u_t, ldu_t,
130  u, ldu );
131  }
132  if( LAPACKE_lsame( jobz, 'a' ) || LAPACKE_lsame( jobz, 's' ) ||
133  ( LAPACKE_lsame( jobz, 'o' ) && (m>=n) ) ) {
134  LAPACKE_zge_trans( LAPACK_COL_MAJOR, nrows_vt, n, vt_t, ldvt_t, vt,
135  ldvt );
136  }
137  /* Release memory and exit */
138  if( LAPACKE_lsame( jobz, 'a' ) || LAPACKE_lsame( jobz, 's' ) ||
139  ( LAPACKE_lsame( jobz, 'o' ) && (m>=n) ) ) {
140  LAPACKE_free( vt_t );
141  }
142 exit_level_2:
143  if( LAPACKE_lsame( jobz, 'a' ) || LAPACKE_lsame( jobz, 's' ) ||
144  ( LAPACKE_lsame( jobz, 'o' ) && (m<n) ) ) {
145  LAPACKE_free( u_t );
146  }
147 exit_level_1:
148  LAPACKE_free( a_t );
149 exit_level_0:
150  if( info == LAPACK_TRANSPOSE_MEMORY_ERROR ) {
151  LAPACKE_xerbla( "LAPACKE_zgesdd_work", info );
152  }
153  } else {
154  info = -1;
155  LAPACKE_xerbla( "LAPACKE_zgesdd_work", info );
156  }
157  return info;
158 }
#define LAPACK_ROW_MAJOR
Definition: lapacke.h:119
#define LAPACKE_free(p)
Definition: lapacke.h:113
void LAPACK_zgesdd(char *jobz, 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, lapack_int *iwork, lapack_int *info)
#define lapack_complex_double
Definition: lapacke.h:90
#define MIN(x, y)
Definition: lapacke_utils.h:50
#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
#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 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)
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