LAPACK  3.7.1
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 36 of file lapacke_sgesvdx_work.c.

43 {
44  lapack_int info = 0;
45  if( matrix_layout == LAPACK_COL_MAJOR ) {
46  /* Call LAPACK function and adjust info */
47  LAPACK_sgesvdx( &jobu, &jobvt, &range, &m, &n, a, &lda, &vl, &vu,
48  &il, &iu, ns, s, u, &ldu, vt, &ldvt,
49  work, &lwork, iwork, &info );
50  if( info < 0 ) {
51  info = info - 1;
52  }
53  } else if( matrix_layout == LAPACK_ROW_MAJOR ) {
54  lapack_int nrows_u = LAPACKE_lsame( jobu, 'v' ) ? m : 0;
55  lapack_int ncols_u = LAPACKE_lsame( jobu, 'v' ) ?
56  ( LAPACKE_lsame( range, 'i' ) ? MAX(iu - il + 1, 0) : MIN(m,n)) : 0;
57  lapack_int nrows_vt = LAPACKE_lsame( jobvt, 'v' ) ?
58  ( LAPACKE_lsame( range, 'i' ) ? MAX(iu - il + 1, 0) : MIN(m,n)) : 0;
59  lapack_int ncols_vt = LAPACKE_lsame( jobvt, 'v' ) ? n : 0;
60 
61  lapack_int lda_t = MAX(1,m);
62  lapack_int ldu_t = MAX(1,nrows_u);
63  lapack_int ldvt_t = MAX(1,nrows_vt);
64 
65  float* a_t = NULL;
66  float* u_t = NULL;
67  float* vt_t = NULL;
68  /* Check leading dimension(s) */
69  if( lda < n ) {
70  info = -8;
71  LAPACKE_xerbla( "LAPACKE_sgesvdx_work", info );
72  return info;
73  }
74  if( ldu < ncols_u ) {
75  info = -16;
76  LAPACKE_xerbla( "LAPACKE_sgesvdx_work", info );
77  return info;
78  }
79  if( ldvt < ncols_vt ) {
80  info = -18;
81  LAPACKE_xerbla( "LAPACKE_sgesvdx_work", info );
82  return info;
83  }
84  /* Query optimal working array(s) size if requested */
85  if( lwork == -1 ) {
86  LAPACK_sgesvdx( &jobu, &jobvt, &range, &m, &n, a, &lda_t, &vl, &vu,
87  &il, &iu, ns, s, u, &ldu_t, vt,
88  &ldvt_t, work, &lwork, iwork, &info );
89  return (info < 0) ? (info - 1) : info;
90  }
91  /* Allocate memory for temporary array(s) */
92  a_t = (float*)LAPACKE_malloc( sizeof(float) * lda_t * MAX(1,n) );
93  if( a_t == NULL ) {
95  goto exit_level_0;
96  }
97  if( LAPACKE_lsame( jobu, 'v' ) ) {
98  u_t = (float*)
99  LAPACKE_malloc( sizeof(float) * ldu_t * MAX(1,ncols_u) );
100  if( u_t == NULL ) {
102  goto exit_level_1;
103  }
104  }
105  if( LAPACKE_lsame( jobvt, 'v' ) ) {
106  vt_t = (float*)
107  LAPACKE_malloc( sizeof(float) * ldvt_t * MAX(1,n) );
108  if( vt_t == NULL ) {
110  goto exit_level_2;
111  }
112  }
113  /* Transpose input matrices */
114  LAPACKE_sge_trans( matrix_layout, m, n, a, lda, a_t, lda_t );
115  /* Call LAPACK function and adjust info */
116  LAPACK_sgesvdx( &jobu, &jobvt, &range, &m, &n, a_t, &lda_t, &vl, &vu,
117  &il, &iu, ns, s, u_t, &ldu_t, vt_t,
118  &ldvt_t, work, &lwork, iwork, &info );
119  if( info < 0 ) {
120  info = info - 1;
121  }
122  /* Transpose output matrices */
123  LAPACKE_sge_trans( LAPACK_COL_MAJOR, m, n, a_t, lda_t, a, lda );
124  if( LAPACKE_lsame( jobu, 'v' ) ) {
125  LAPACKE_sge_trans( LAPACK_COL_MAJOR, nrows_u, ncols_u, u_t, ldu_t,
126  u, ldu );
127  }
128  if( LAPACKE_lsame( jobvt, 'v' ) ) {
129  LAPACKE_sge_trans( LAPACK_COL_MAJOR, nrows_vt, n, vt_t, ldvt_t, vt,
130  ldvt );
131  }
132  /* Release memory and exit */
133  if( LAPACKE_lsame( jobvt, 'v' ) ) {
134  LAPACKE_free( vt_t );
135  }
136 exit_level_2:
137  if( LAPACKE_lsame( jobu, 'v' ) ) {
138  LAPACKE_free( u_t );
139  }
140 exit_level_1:
141  LAPACKE_free( a_t );
142 exit_level_0:
143  if( info == LAPACK_TRANSPOSE_MEMORY_ERROR ) {
144  LAPACKE_xerbla( "LAPACKE_sgesvdx_work", info );
145  }
146  } else {
147  info = -1;
148  LAPACKE_xerbla( "LAPACKE_sgesvdx_work", info );
149  }
150  return info;
151 }
void LAPACK_sgesvdx(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, lapack_int *info)
#define LAPACK_ROW_MAJOR
Definition: lapacke.h:119
#define LAPACKE_free(p)
Definition: lapacke.h:113
#define MIN(x, y)
Definition: lapacke_utils.h:50
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: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
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