158 lines
3.5 KiB
C++
158 lines
3.5 KiB
C++
// SPDX-License-Identifier: Apache-2.0
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//
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// Copyright 2008-2016 Conrad Sanderson (http://conradsanderson.id.au)
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// Copyright 2008-2016 National ICT Australia (NICTA)
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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// ------------------------------------------------------------------------
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//! \addtogroup fn_log_det
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//! @{
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//! log determinant of mat
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template<typename T1>
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inline
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bool
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log_det
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(
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typename T1::elem_type& out_val,
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typename T1::pod_type& out_sign,
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const Base<typename T1::elem_type,T1>& X,
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const typename arma_blas_type_only<typename T1::elem_type>::result* junk = nullptr
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)
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{
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arma_extra_debug_sigprint();
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arma_ignore(junk);
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typedef typename T1::elem_type eT;
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typedef typename T1::pod_type T;
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const bool status = op_log_det::apply_direct(out_val, out_sign, X.get_ref());
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if(status == false)
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{
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out_val = eT(Datum<T>::nan);
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out_sign = T(0);
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arma_debug_warn_level(3, "log_det(): failed to find determinant");
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}
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return status;
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}
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template<typename T1>
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inline
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arma_warn_unused
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std::complex<typename T1::pod_type>
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log_det
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(
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const Base<typename T1::elem_type,T1>& X,
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const typename arma_blas_type_only<typename T1::elem_type>::result* junk = nullptr
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)
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{
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arma_extra_debug_sigprint();
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arma_ignore(junk);
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typedef typename T1::elem_type eT;
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typedef typename T1::pod_type T;
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eT out_val = eT(0);
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T out_sign = T(0);
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const bool status = op_log_det::apply_direct(out_val, out_sign, X.get_ref());
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if(status == false)
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{
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out_val = eT(Datum<T>::nan);
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out_sign = T(0);
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arma_stop_runtime_error("log_det(): failed to find determinant");
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}
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return (out_sign >= T(1)) ? std::complex<T>(out_val) : (out_val + std::complex<T>(T(0),Datum<T>::pi));
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}
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//
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template<typename T1>
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inline
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bool
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log_det_sympd
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(
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typename T1::pod_type& out_val,
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const Base<typename T1::elem_type,T1>& X,
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const typename arma_blas_type_only<typename T1::elem_type>::result* junk = nullptr
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)
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{
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arma_extra_debug_sigprint();
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arma_ignore(junk);
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typedef typename T1::pod_type T;
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out_val = T(0);
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const bool status = op_log_det_sympd::apply_direct(out_val, X.get_ref());
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if(status == false)
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{
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out_val = Datum<T>::nan;
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arma_debug_warn_level(3, "log_det_sympd(): given matrix is not symmetric positive definite");
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}
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return status;
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}
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template<typename T1>
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inline
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arma_warn_unused
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typename T1::pod_type
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log_det_sympd
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(
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const Base<typename T1::elem_type,T1>& X,
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const typename arma_blas_type_only<typename T1::elem_type>::result* junk = nullptr
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)
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{
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arma_extra_debug_sigprint();
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arma_ignore(junk);
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typedef typename T1::pod_type T;
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T out_val = T(0);
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const bool status = op_log_det_sympd::apply_direct(out_val, X.get_ref());
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if(status == false)
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{
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out_val = Datum<T>::nan;
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arma_stop_runtime_error("log_det_sympd(): given matrix is not symmetric positive definite");
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}
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return out_val;
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}
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//! @}
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