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// SPDX-License-Identifier: Apache-2.0
//
// Copyright 2008-2016 Conrad Sanderson (http://conradsanderson.id.au)
// Copyright 2008-2016 National ICT Australia (NICTA)
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// ------------------------------------------------------------------------
//! \addtogroup fn_lu
//! @{
//! immediate lower upper decomposition, permutation info is embedded into L (similar to Matlab/Octave)
template<typename T1>
inline
bool
lu
(
Mat<typename T1::elem_type>& L,
Mat<typename T1::elem_type>& U,
const Base<typename T1::elem_type,T1>& X,
const typename arma_blas_type_only<typename T1::elem_type>::result* junk = nullptr
)
{
arma_extra_debug_sigprint();
arma_ignore(junk);
arma_debug_check( (&L == &U), "lu(): L and U are the same object" );
const bool status = auxlib::lu(L, U, X);
if(status == false)
{
L.soft_reset();
U.soft_reset();
arma_debug_warn_level(3, "lu(): decomposition failed");
}
return status;
}
//! immediate lower upper decomposition, also providing the permutation matrix
template<typename T1>
inline
bool
lu
(
Mat<typename T1::elem_type>& L,
Mat<typename T1::elem_type>& U,
Mat<typename T1::elem_type>& P,
const Base<typename T1::elem_type,T1>& X,
const typename arma_blas_type_only<typename T1::elem_type>::result* junk = nullptr
)
{
arma_extra_debug_sigprint();
arma_ignore(junk);
arma_debug_check( ( (&L == &U) || (&L == &P) || (&U == &P) ), "lu(): two or more output objects are the same object" );
const bool status = auxlib::lu(L, U, P, X);
if(status == false)
{
L.soft_reset();
U.soft_reset();
P.soft_reset();
arma_debug_warn_level(3, "lu(): decomposition failed");
}
return status;
}
//! @}
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