LAPACK  3.5.0
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lapacke_dgelsd_work.c File Reference
#include "lapacke_utils.h"
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Functions/Subroutines

lapack_int LAPACKE_dgelsd_work (int matrix_order, lapack_int m, lapack_int n, lapack_int nrhs, double *a, lapack_int lda, double *b, lapack_int ldb, double *s, double rcond, lapack_int *rank, double *work, lapack_int lwork, lapack_int *iwork)

Function/Subroutine Documentation

lapack_int LAPACKE_dgelsd_work ( int  matrix_order,
lapack_int  m,
lapack_int  n,
lapack_int  nrhs,
double *  a,
lapack_int  lda,
double *  b,
lapack_int  ldb,
double *  s,
double  rcond,
lapack_int rank,
double *  work,
lapack_int  lwork,
lapack_int iwork 
)

Definition at line 36 of file lapacke_dgelsd_work.c.

{
lapack_int info = 0;
if( matrix_order == LAPACK_COL_MAJOR ) {
/* Call LAPACK function and adjust info */
LAPACK_dgelsd( &m, &n, &nrhs, a, &lda, b, &ldb, s, &rcond, rank, work,
&lwork, iwork, &info );
if( info < 0 ) {
info = info - 1;
}
} else if( matrix_order == LAPACK_ROW_MAJOR ) {
lapack_int lda_t = MAX(1,m);
lapack_int ldb_t = MAX(1,MAX(m,n));
double* a_t = NULL;
double* b_t = NULL;
/* Check leading dimension(s) */
if( lda < n ) {
info = -6;
LAPACKE_xerbla( "LAPACKE_dgelsd_work", info );
return info;
}
if( ldb < nrhs ) {
info = -8;
LAPACKE_xerbla( "LAPACKE_dgelsd_work", info );
return info;
}
/* Query optimal working array(s) size if requested */
if( lwork == -1 ) {
LAPACK_dgelsd( &m, &n, &nrhs, a, &lda_t, b, &ldb_t, s, &rcond, rank,
work, &lwork, iwork, &info );
return (info < 0) ? (info - 1) : info;
}
/* Allocate memory for temporary array(s) */
a_t = (double*)LAPACKE_malloc( sizeof(double) * lda_t * MAX(1,n) );
if( a_t == NULL ) {
goto exit_level_0;
}
b_t = (double*)LAPACKE_malloc( sizeof(double) * ldb_t * MAX(1,nrhs) );
if( b_t == NULL ) {
goto exit_level_1;
}
/* Transpose input matrices */
LAPACKE_dge_trans( matrix_order, m, n, a, lda, a_t, lda_t );
LAPACKE_dge_trans( matrix_order, MAX(m,n), nrhs, b, ldb, b_t, ldb_t );
/* Call LAPACK function and adjust info */
LAPACK_dgelsd( &m, &n, &nrhs, a_t, &lda_t, b_t, &ldb_t, s, &rcond, rank,
work, &lwork, iwork, &info );
if( info < 0 ) {
info = info - 1;
}
/* Transpose output matrices */
LAPACKE_dge_trans( LAPACK_COL_MAJOR, m, n, a_t, lda_t, a, lda );
LAPACKE_dge_trans( LAPACK_COL_MAJOR, MAX(m,n), nrhs, b_t, ldb_t, b,
ldb );
/* Release memory and exit */
LAPACKE_free( b_t );
exit_level_1:
LAPACKE_free( a_t );
exit_level_0:
LAPACKE_xerbla( "LAPACKE_dgelsd_work", info );
}
} else {
info = -1;
LAPACKE_xerbla( "LAPACKE_dgelsd_work", info );
}
return info;
}

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