LAPACK  3.8.0
LAPACK: Linear Algebra PACKage

◆ LAPACKE_zgesvdx()

lapack_int LAPACKE_zgesvdx ( 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_int superb 
)

Definition at line 36 of file lapacke_zgesvdx.c.

43 {
44  lapack_int info = 0;
45  lapack_int lwork = -1;
46  lapack_complex_double* work = NULL;
47  lapack_complex_double work_query;
48  double* rwork = NULL;
49  lapack_int lrwork = MAX(1,MIN(m,n)*(MIN(m,n)*2+15*MIN(m,n)));
50  lapack_int* iwork = NULL;
51  lapack_int i;
52  if( matrix_layout != LAPACK_COL_MAJOR && matrix_layout != LAPACK_ROW_MAJOR ) {
53  LAPACKE_xerbla( "LAPACKE_zgesvdx", -1 );
54  return -1;
55  }
56 #ifndef LAPACK_DISABLE_NAN_CHECK
57  if( LAPACKE_get_nancheck() ) {
58  /* Optionally check input matrices for NaNs */
59  if( LAPACKE_zge_nancheck( matrix_layout, m, n, a, lda ) ) {
60  return -6;
61  }
62  }
63 #endif
64  /* Query optimal working array(s) size */
65  info = LAPACKE_zgesvdx_work( matrix_layout, jobu, jobvt, range,
66  m, n, a, lda, vl, vu, il, iu, ns, s, u,
67  ldu, vt, ldvt, &work_query, lwork, rwork, iwork );
68  if( info != 0 ) {
69  goto exit_level_0;
70  }
71  lwork = LAPACK_Z2INT (work_query);
72  /* Allocate memory for work arrays */
73  work = (lapack_complex_double*)
74  LAPACKE_malloc( sizeof(lapack_complex_double) * lwork );
75  if( work == NULL ) {
77  goto exit_level_1;
78  }
79  rwork = (double*)LAPACKE_malloc( sizeof(double) * lrwork );
80  if( rwork == NULL ) {
82  goto exit_level_0;
83  }
84  iwork = (lapack_int*)LAPACKE_malloc( sizeof(lapack_int) * MAX(1,(12*MIN(m,n))) );
85  if( iwork == NULL ) {
87  goto exit_level_2;
88  }
89  /* Call middle-level interface */
90  info = LAPACKE_zgesvdx_work( matrix_layout, jobu, jobvt, range,
91  m, n, a, lda, vl, vu, il, iu, ns, s, u,
92  ldu, vt, ldvt, work, lwork, rwork, iwork );
93  /* Backup significant data from working array(s) */
94  for( i=0; i<12*MIN(m,n)-1; i++ ) {
95  superb[i] = iwork[i+1];
96  }
97  /* Release memory and exit */
98  LAPACKE_free( iwork );
99 exit_level_2:
100  LAPACKE_free( work );
101 exit_level_1:
102  LAPACKE_free( rwork );
103 exit_level_0:
104  if( info == LAPACK_WORK_MEMORY_ERROR ) {
105  LAPACKE_xerbla( "LAPACKE_zgesvdx", info );
106  }
107  return info;
108 }
#define LAPACK_Z2INT(x)
Definition: lapacke.h:117
#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
#define lapack_complex_double
Definition: lapacke.h:90
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)
#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
lapack_logical LAPACKE_zge_nancheck(int matrix_layout, lapack_int m, lapack_int n, const lapack_complex_double *a, lapack_int lda)
int LAPACKE_get_nancheck()
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