LAPACK  3.7.1
LAPACK: Linear Algebra PACKage

◆ LAPACKE_sgelsy_work()

lapack_int LAPACKE_sgelsy_work ( int  matrix_layout,
lapack_int  m,
lapack_int  n,
lapack_int  nrhs,
float *  a,
lapack_int  lda,
float *  b,
lapack_int  ldb,
lapack_int jpvt,
float  rcond,
lapack_int rank,
float *  work,
lapack_int  lwork 
)

Definition at line 36 of file lapacke_sgelsy_work.c.

41 {
42  lapack_int info = 0;
43  if( matrix_layout == LAPACK_COL_MAJOR ) {
44  /* Call LAPACK function and adjust info */
45  LAPACK_sgelsy( &m, &n, &nrhs, a, &lda, b, &ldb, jpvt, &rcond, rank,
46  work, &lwork, &info );
47  if( info < 0 ) {
48  info = info - 1;
49  }
50  } else if( matrix_layout == LAPACK_ROW_MAJOR ) {
51  lapack_int lda_t = MAX(1,m);
52  lapack_int ldb_t = MAX(1,MAX(m,n));
53  float* a_t = NULL;
54  float* b_t = NULL;
55  /* Check leading dimension(s) */
56  if( lda < n ) {
57  info = -6;
58  LAPACKE_xerbla( "LAPACKE_sgelsy_work", info );
59  return info;
60  }
61  if( ldb < nrhs ) {
62  info = -8;
63  LAPACKE_xerbla( "LAPACKE_sgelsy_work", info );
64  return info;
65  }
66  /* Query optimal working array(s) size if requested */
67  if( lwork == -1 ) {
68  LAPACK_sgelsy( &m, &n, &nrhs, a, &lda_t, b, &ldb_t, jpvt, &rcond,
69  rank, work, &lwork, &info );
70  return (info < 0) ? (info - 1) : info;
71  }
72  /* Allocate memory for temporary array(s) */
73  a_t = (float*)LAPACKE_malloc( sizeof(float) * lda_t * MAX(1,n) );
74  if( a_t == NULL ) {
76  goto exit_level_0;
77  }
78  b_t = (float*)LAPACKE_malloc( sizeof(float) * ldb_t * MAX(1,nrhs) );
79  if( b_t == NULL ) {
81  goto exit_level_1;
82  }
83  /* Transpose input matrices */
84  LAPACKE_sge_trans( matrix_layout, m, n, a, lda, a_t, lda_t );
85  LAPACKE_sge_trans( matrix_layout, MAX(m,n), nrhs, b, ldb, b_t, ldb_t );
86  /* Call LAPACK function and adjust info */
87  LAPACK_sgelsy( &m, &n, &nrhs, a_t, &lda_t, b_t, &ldb_t, jpvt, &rcond,
88  rank, work, &lwork, &info );
89  if( info < 0 ) {
90  info = info - 1;
91  }
92  /* Transpose output matrices */
93  LAPACKE_sge_trans( LAPACK_COL_MAJOR, m, n, a_t, lda_t, a, lda );
94  LAPACKE_sge_trans( LAPACK_COL_MAJOR, MAX(m,n), nrhs, b_t, ldb_t, b,
95  ldb );
96  /* Release memory and exit */
97  LAPACKE_free( b_t );
98 exit_level_1:
99  LAPACKE_free( a_t );
100 exit_level_0:
101  if( info == LAPACK_TRANSPOSE_MEMORY_ERROR ) {
102  LAPACKE_xerbla( "LAPACKE_sgelsy_work", info );
103  }
104  } else {
105  info = -1;
106  LAPACKE_xerbla( "LAPACKE_sgelsy_work", info );
107  }
108  return info;
109 }
#define LAPACK_ROW_MAJOR
Definition: lapacke.h:119
#define LAPACKE_free(p)
Definition: lapacke.h:113
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
#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
void LAPACK_sgelsy(lapack_int *m, lapack_int *n, lapack_int *nrhs, float *a, lapack_int *lda, float *b, lapack_int *ldb, lapack_int *jpvt, float *rcond, lapack_int *rank, float *work, lapack_int *lwork, lapack_int *info)
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