LAPACK  3.7.1
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 36 of file lapacke_zgesvdx_work.c.

44 {
45  lapack_int info = 0;
46  if( matrix_layout == LAPACK_COL_MAJOR ) {
47  /* Call LAPACK function and adjust info */
48  LAPACK_zgesvdx( &jobu, &jobvt, &range, &m, &n, a, &lda, &vl, &vu,
49  &il, &iu, ns, s, u, &ldu, vt, &ldvt,
50  work, &lwork, rwork, iwork, &info );
51  if( info < 0 ) {
52  info = info - 1;
53  }
54  } else if( matrix_layout == LAPACK_ROW_MAJOR ) {
55  lapack_int nrows_u = LAPACKE_lsame( jobu, 'v' ) ? m : 0;
56  lapack_int ncols_u = LAPACKE_lsame( jobu, 'v' ) ?
57  ( LAPACKE_lsame( range, 'i' ) ? MAX(iu - il + 1, 0) : MIN(m,n)) : 0;
58  lapack_int nrows_vt = LAPACKE_lsame( jobvt, 'v' ) ?
59  ( LAPACKE_lsame( range, 'i' ) ? MAX(iu - il + 1, 0) : MIN(m,n)) : 0;
60  lapack_int ncols_vt = LAPACKE_lsame( jobvt, 'v' ) ? n : 0;
61 
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 
66  lapack_complex_double* a_t = NULL;
67  lapack_complex_double* u_t = NULL;
68  lapack_complex_double* vt_t = NULL;
69  /* Check leading dimension(s) */
70  if( lda < n ) {
71  info = -8;
72  LAPACKE_xerbla( "LAPACKE_zgesvdx_work", info );
73  return info;
74  }
75  if( ldu < ncols_u ) {
76  info = -16;
77  LAPACKE_xerbla( "LAPACKE_zgesvdx_work", info );
78  return info;
79  }
80  if( ldvt < ncols_vt ) {
81  info = -18;
82  LAPACKE_xerbla( "LAPACKE_zgesvdx_work", info );
83  return info;
84  }
85  /* Query optimal working array(s) size if requested */
86  if( lwork == -1 ) {
87  LAPACK_zgesvdx( &jobu, &jobvt, &range, &m, &n, a, &lda_t, &vl, &vu,
88  &il, &iu, ns, s, u, &ldu_t, vt,
89  &ldvt_t, work, &lwork, rwork, iwork, &info );
90  return (info < 0) ? (info - 1) : info;
91  }
92  /* Allocate memory for temporary array(s) */
93  a_t = (lapack_complex_double*)
94  LAPACKE_malloc( sizeof(lapack_complex_double) * lda_t * MAX(1,n) );
95  if( a_t == NULL ) {
97  goto exit_level_0;
98  }
99  if( LAPACKE_lsame( jobu, 'v' ) ) {
100  u_t = (lapack_complex_double*)
101  LAPACKE_malloc( sizeof(lapack_complex_double) * ldu_t * MAX(1,ncols_u) );
102  if( u_t == NULL ) {
104  goto exit_level_1;
105  }
106  }
107  if( LAPACKE_lsame( jobvt, 'v' ) ) {
108  vt_t = (lapack_complex_double*)
109  LAPACKE_malloc( sizeof(lapack_complex_double) * ldvt_t * MAX(1,n) );
110  if( vt_t == NULL ) {
112  goto exit_level_2;
113  }
114  }
115  /* Transpose input matrices */
116  LAPACKE_zge_trans( matrix_layout, m, n, a, lda, a_t, lda_t );
117  /* Call LAPACK function and adjust info */
118  LAPACK_zgesvdx( &jobu, &jobvt, &range, &m, &n, a_t, &lda_t, &vl, &vu,
119  &il, &iu, ns, s, u_t, &ldu_t, vt_t,
120  &ldvt_t, work, &lwork, rwork, iwork, &info );
121  if( info < 0 ) {
122  info = info - 1;
123  }
124  /* Transpose output matrices */
125  LAPACKE_zge_trans( LAPACK_COL_MAJOR, m, n, a_t, lda_t, a, lda );
126  if( LAPACKE_lsame( jobu, 'v' ) ) {
127  LAPACKE_zge_trans( LAPACK_COL_MAJOR, nrows_u, ncols_u, u_t, ldu_t,
128  u, ldu );
129  }
130  if( LAPACKE_lsame( jobvt, 'v' ) ) {
131  LAPACKE_zge_trans( LAPACK_COL_MAJOR, nrows_vt, n, vt_t, ldvt_t, vt,
132  ldvt );
133  }
134  /* Release memory and exit */
135  if( LAPACKE_lsame( jobvt, 'v' ) ) {
136  LAPACKE_free( vt_t );
137  }
138 exit_level_2:
139  if( LAPACKE_lsame( jobu, 'v' ) ) {
140  LAPACKE_free( u_t );
141  }
142 exit_level_1:
143  LAPACKE_free( a_t );
144 exit_level_0:
145  if( info == LAPACK_TRANSPOSE_MEMORY_ERROR ) {
146  LAPACKE_xerbla( "LAPACKE_zgesvdx_work", info );
147  }
148  } else {
149  info = -1;
150  LAPACKE_xerbla( "LAPACKE_zgesvdx_work", info );
151  }
152  return info;
153 }
#define LAPACK_ROW_MAJOR
Definition: lapacke.h:119
#define LAPACKE_free(p)
Definition: lapacke.h:113
#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)
void LAPACK_zgesvdx(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, lapack_int *info)
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