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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 op_chol
//! @{
template<typename T1>
inline
void
op_chol::apply(Mat<typename T1::elem_type>& out, const Op<T1,op_chol>& X)
{
arma_extra_debug_sigprint();
const bool status = op_chol::apply_direct(out, X.m, X.aux_uword_a);
if(status == false)
{
out.soft_reset();
arma_stop_runtime_error("chol(): decomposition failed");
}
}
template<typename T1>
inline
bool
op_chol::apply_direct(Mat<typename T1::elem_type>& out, const Base<typename T1::elem_type,T1>& A_expr, const uword layout)
{
arma_extra_debug_sigprint();
typedef typename T1::elem_type eT;
out = A_expr.get_ref();
arma_debug_check( (out.is_square() == false), "chol(): given matrix must be square sized", [&](){ out.soft_reset(); } );
if(out.is_empty()) { return true; }
if((arma_config::debug) && (auxlib::rudimentary_sym_check(out) == false))
{
if(is_cx<eT>::no ) { arma_debug_warn_level(1, "chol(): given matrix is not symmetric"); }
if(is_cx<eT>::yes) { arma_debug_warn_level(1, "chol(): given matrix is not hermitian"); }
}
uword KD = 0;
const bool is_band = arma_config::optimise_band && ((auxlib::crippled_lapack(out)) ? false : ((layout == 0) ? band_helper::is_band_upper(KD, out, uword(32)) : band_helper::is_band_lower(KD, out, uword(32))));
const bool status = (is_band) ? auxlib::chol_band(out, KD, layout) : auxlib::chol(out, layout);
return status;
}
//! @}
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