LAPACK  3.10.0
LAPACK: Linear Algebra PACKage

◆ LAPACKE_sgesvdx_work()

lapack_int LAPACKE_sgesvdx_work ( int  matrix_layout,
char  jobu,
char  jobvt,
char  range,
lapack_int  m,
lapack_int  n,
float *  a,
lapack_int  lda,
float  vl,
float  vu,
lapack_int  il,
lapack_int  iu,
lapack_int ns,
float *  s,
float *  u,
lapack_int  ldu,
float *  vt,
lapack_int  ldvt,
float *  work,
lapack_int  lwork,
lapack_int iwork 
)

Definition at line 35 of file lapacke_sgesvdx_work.c.

42 {
43  lapack_int info = 0;
44  if( matrix_layout == LAPACK_COL_MAJOR ) {
45  /* Call LAPACK function and adjust info */
46  LAPACK_sgesvdx( &jobu, &jobvt, &range, &m, &n, a, &lda, &vl, &vu,
47  &il, &iu, ns, s, u, &ldu, vt, &ldvt,
48  work, &lwork, 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( jobu, 'v' ) ? m : 0;
54  lapack_int ncols_u = LAPACKE_lsame( jobu, 'v' ) ?
55  ( LAPACKE_lsame( range, 'i' ) ? MAX(iu - il + 1, 0) : MIN(m,n)) : 0;
56  lapack_int nrows_vt = LAPACKE_lsame( jobvt, 'v' ) ?
57  ( LAPACKE_lsame( range, 'i' ) ? MAX(iu - il + 1, 0) : MIN(m,n)) : 0;
58  lapack_int ncols_vt = LAPACKE_lsame( jobvt, 'v' ) ? n : 0;
59 
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 
64  float* a_t = NULL;
65  float* u_t = NULL;
66  float* vt_t = NULL;
67  /* Check leading dimension(s) */
68  if( lda < n ) {
69  info = -8;
70  LAPACKE_xerbla( "LAPACKE_sgesvdx_work", info );
71  return info;
72  }
73  if( ldu < ncols_u ) {
74  info = -16;
75  LAPACKE_xerbla( "LAPACKE_sgesvdx_work", info );
76  return info;
77  }
78  if( ldvt < ncols_vt ) {
79  info = -18;
80  LAPACKE_xerbla( "LAPACKE_sgesvdx_work", info );
81  return info;
82  }
83  /* Query optimal working array(s) size if requested */
84  if( lwork == -1 ) {
85  LAPACK_sgesvdx( &jobu, &jobvt, &range, &m, &n, a, &lda_t, &vl, &vu,
86  &il, &iu, ns, s, u, &ldu_t, vt,
87  &ldvt_t, work, &lwork, iwork, &info );
88  return (info < 0) ? (info - 1) : info;
89  }
90  /* Allocate memory for temporary array(s) */
91  a_t = (float*)LAPACKE_malloc( sizeof(float) * lda_t * MAX(1,n) );
92  if( a_t == NULL ) {
94  goto exit_level_0;
95  }
96  if( LAPACKE_lsame( jobu, 'v' ) ) {
97  u_t = (float*)
98  LAPACKE_malloc( sizeof(float) * ldu_t * MAX(1,ncols_u) );
99  if( u_t == NULL ) {
101  goto exit_level_1;
102  }
103  }
104  if( LAPACKE_lsame( jobvt, 'v' ) ) {
105  vt_t = (float*)
106  LAPACKE_malloc( sizeof(float) * ldvt_t * MAX(1,n) );
107  if( vt_t == NULL ) {
109  goto exit_level_2;
110  }
111  }
112  /* Transpose input matrices */
113  LAPACKE_sge_trans( matrix_layout, m, n, a, lda, a_t, lda_t );
114  /* Call LAPACK function and adjust info */
115  LAPACK_sgesvdx( &jobu, &jobvt, &range, &m, &n, a_t, &lda_t, &vl, &vu,
116  &il, &iu, ns, s, u_t, &ldu_t, vt_t,
117  &ldvt_t, work, &lwork, iwork, &info );
118  if( info < 0 ) {
119  info = info - 1;
120  }
121  /* Transpose output matrices */
122  LAPACKE_sge_trans( LAPACK_COL_MAJOR, m, n, a_t, lda_t, a, lda );
123  if( LAPACKE_lsame( jobu, 'v' ) ) {
124  LAPACKE_sge_trans( LAPACK_COL_MAJOR, nrows_u, ncols_u, u_t, ldu_t,
125  u, ldu );
126  }
127  if( LAPACKE_lsame( jobvt, 'v' ) ) {
128  LAPACKE_sge_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, 'v' ) ) {
133  LAPACKE_free( vt_t );
134  }
135 exit_level_2:
136  if( LAPACKE_lsame( jobu, 'v' ) ) {
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_sgesvdx_work", info );
144  }
145  } else {
146  info = -1;
147  LAPACKE_xerbla( "LAPACKE_sgesvdx_work", info );
148  }
149  return info;
150 }
#define lapack_int
Definition: lapack.h:83
#define LAPACK_sgesvdx(...)
Definition: lapack.h:3591
#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
void LAPACKE_sge_trans(int matrix_layout, lapack_int m, lapack_int n, const float *in, lapack_int ldin, float *out, lapack_int ldout)
#define MAX(x, y)
Definition: lapacke_utils.h:46
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