LAPACK  3.5.0
LAPACK: Linear Algebra PACKage
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lapacke_dgetrs_work.c File Reference
#include "lapacke_utils.h"
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Functions/Subroutines

lapack_int LAPACKE_dgetrs_work (int matrix_order, char trans, lapack_int n, lapack_int nrhs, const double *a, lapack_int lda, const lapack_int *ipiv, double *b, lapack_int ldb)

Function/Subroutine Documentation

lapack_int LAPACKE_dgetrs_work ( int  matrix_order,
char  trans,
lapack_int  n,
lapack_int  nrhs,
const double *  a,
lapack_int  lda,
const lapack_int ipiv,
double *  b,
lapack_int  ldb 
)

Definition at line 36 of file lapacke_dgetrs_work.c.

{
lapack_int info = 0;
if( matrix_order == LAPACK_COL_MAJOR ) {
/* Call LAPACK function and adjust info */
LAPACK_dgetrs( &trans, &n, &nrhs, a, &lda, ipiv, b, &ldb, &info );
if( info < 0 ) {
info = info - 1;
}
} else if( matrix_order == LAPACK_ROW_MAJOR ) {
lapack_int lda_t = MAX(1,n);
lapack_int ldb_t = MAX(1,n);
double* a_t = NULL;
double* b_t = NULL;
/* Check leading dimension(s) */
if( lda < n ) {
info = -6;
LAPACKE_xerbla( "LAPACKE_dgetrs_work", info );
return info;
}
if( ldb < nrhs ) {
info = -9;
LAPACKE_xerbla( "LAPACKE_dgetrs_work", info );
return 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, n, n, a, lda, a_t, lda_t );
LAPACKE_dge_trans( matrix_order, n, nrhs, b, ldb, b_t, ldb_t );
/* Call LAPACK function and adjust info */
LAPACK_dgetrs( &trans, &n, &nrhs, a_t, &lda_t, ipiv, b_t, &ldb_t,
&info );
if( info < 0 ) {
info = info - 1;
}
/* Transpose output matrices */
LAPACKE_dge_trans( LAPACK_COL_MAJOR, 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_dgetrs_work", info );
}
} else {
info = -1;
LAPACKE_xerbla( "LAPACKE_dgetrs_work", info );
}
return info;
}

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