LAPACK  3.7.1
LAPACK: Linear Algebra PACKage

◆ LAPACKE_sgesvdx()

lapack_int LAPACKE_sgesvdx ( 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,
lapack_int superb 
)

Definition at line 36 of file lapacke_sgesvdx.c.

43 {
44  lapack_int info = 0;
45  lapack_int lwork = -1;
46  float* work = NULL;
47  float work_query;
48  lapack_int* iwork = NULL;
49  lapack_int i;
50  if( matrix_layout != LAPACK_COL_MAJOR && matrix_layout != LAPACK_ROW_MAJOR ) {
51  LAPACKE_xerbla( "LAPACKE_sgesvdx", -1 );
52  return -1;
53  }
54 #ifndef LAPACK_DISABLE_NAN_CHECK
55  /* Optionally check input matrices for NaNs */
56  if( LAPACKE_sge_nancheck( matrix_layout, m, n, a, lda ) ) {
57  return -6;
58  }
59 #endif
60  /* Query optimal working array(s) size */
61  info = LAPACKE_sgesvdx_work( matrix_layout, jobu, jobvt, range,
62  m, n, a, lda, vl, vu, il, iu, ns, s, u,
63  ldu, vt, ldvt, &work_query, lwork, iwork );
64  if( info != 0 ) {
65  goto exit_level_0;
66  }
67  lwork = (lapack_int)work_query;
68  /* Allocate memory for work arrays */
69  work = (float*)LAPACKE_malloc( sizeof(float) * lwork );
70  if( work == NULL ) {
72  goto exit_level_0;
73  }
74  iwork = (lapack_int*)LAPACKE_malloc( sizeof(lapack_int) * MAX(1,(12*MIN(m,n))) );
75  if( iwork == NULL ) {
77  goto exit_level_1;
78  }
79  /* Call middle-level interface */
80  info = LAPACKE_sgesvdx_work( matrix_layout, jobu, jobvt, range,
81  m, n, a, lda, vl, vu, il, iu, ns, s, u,
82  ldu, vt, ldvt, work, lwork, iwork );
83  /* Backup significant data from working array(s) */
84  for( i=0; i<12*MIN(m,n)-1; i++ ) {
85  superb[i] = iwork[i+1];
86  }
87  /* Release memory and exit */
88  LAPACKE_free( iwork );
89 exit_level_1:
90  LAPACKE_free( work );
91 exit_level_0:
92  if( info == LAPACK_WORK_MEMORY_ERROR ) {
93  LAPACKE_xerbla( "LAPACKE_sgesvdx", info );
94  }
95  return info;
96 }
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)
#define LAPACK_ROW_MAJOR
Definition: lapacke.h:119
#define LAPACK_WORK_MEMORY_ERROR
Definition: lapacke.h:122
#define LAPACKE_free(p)
Definition: lapacke.h:113
lapack_logical LAPACKE_sge_nancheck(int matrix_layout, lapack_int m, lapack_int n, const float *a, lapack_int lda)
#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
#define LAPACK_COL_MAJOR
Definition: lapacke.h:120
void LAPACKE_xerbla(const char *name, lapack_int info)
#define lapack_int
Definition: lapacke.h:47
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