LAPACK 3.11.0
LAPACK: Linear Algebra PACKage
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◆ 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 35 of file lapacke_sgesvdx.c.

42{
43 lapack_int info = 0;
44 lapack_int lwork = -1;
45 float* work = NULL;
46 float work_query;
47 lapack_int* iwork = NULL;
48 lapack_int i;
49 if( matrix_layout != LAPACK_COL_MAJOR && matrix_layout != LAPACK_ROW_MAJOR ) {
50 LAPACKE_xerbla( "LAPACKE_sgesvdx", -1 );
51 return -1;
52 }
53#ifndef LAPACK_DISABLE_NAN_CHECK
54 if( LAPACKE_get_nancheck() ) {
55 /* Optionally check input matrices for NaNs */
56 if( LAPACKE_sge_nancheck( matrix_layout, m, n, a, lda ) ) {
57 return -6;
58 }
59 }
60#endif
61 /* Query optimal working array(s) size */
62 info = LAPACKE_sgesvdx_work( matrix_layout, jobu, jobvt, range,
63 m, n, a, lda, vl, vu, il, iu, ns, s, u,
64 ldu, vt, ldvt, &work_query, lwork, iwork );
65 if( info != 0 ) {
66 goto exit_level_0;
67 }
68 lwork = (lapack_int)work_query;
69 /* Allocate memory for work arrays */
70 work = (float*)LAPACKE_malloc( sizeof(float) * lwork );
71 if( work == NULL ) {
73 goto exit_level_0;
74 }
75 iwork = (lapack_int*)LAPACKE_malloc( sizeof(lapack_int) * MAX(1,(12*MIN(m,n))) );
76 if( iwork == NULL ) {
78 goto exit_level_1;
79 }
80 /* Call middle-level interface */
81 info = LAPACKE_sgesvdx_work( matrix_layout, jobu, jobvt, range,
82 m, n, a, lda, vl, vu, il, iu, ns, s, u,
83 ldu, vt, ldvt, work, lwork, iwork );
84 /* Backup significant data from working array(s) */
85 for( i=0; i<12*MIN(m,n)-1; i++ ) {
86 superb[i] = iwork[i+1];
87 }
88 /* Release memory and exit */
89 LAPACKE_free( iwork );
90exit_level_1:
91 LAPACKE_free( work );
92exit_level_0:
93 if( info == LAPACK_WORK_MEMORY_ERROR ) {
94 LAPACKE_xerbla( "LAPACKE_sgesvdx", info );
95 }
96 return info;
97}
#define lapack_int
Definition: lapack.h:87
#define LAPACK_WORK_MEMORY_ERROR
Definition: lapacke.h:55
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_COL_MAJOR
Definition: lapacke.h:53
#define LAPACKE_free(p)
Definition: lapacke.h:46
#define LAPACK_ROW_MAJOR
Definition: lapacke.h:52
int LAPACKE_get_nancheck(void)
#define LAPACKE_malloc(size)
Definition: lapacke.h:43
void LAPACKE_xerbla(const char *name, lapack_int info)
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:49
#define MAX(x, y)
Definition: lapacke_utils.h:46
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