115 lines
2.9 KiB
C++
115 lines
2.9 KiB
C++
// 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 op_cond
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//! @{
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template<typename T1>
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inline
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typename T1::pod_type
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op_cond::cond(const Base<typename T1::elem_type, T1>& X)
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{
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arma_extra_debug_sigprint();
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typedef typename T1::elem_type eT;
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typedef typename T1::pod_type T;
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Mat<eT> A(X.get_ref());
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Col<T> S;
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const bool status = auxlib::svd_dc(S, A);
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if(status == false)
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{
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arma_debug_warn_level(3, "cond(): svd failed");
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return T(0);
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}
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return (S.n_elem > 0) ? T( max(S) / min(S) ) : T(0);
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}
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template<typename T1>
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inline
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typename T1::pod_type
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op_cond::rcond(const Base<typename T1::elem_type, T1>& X)
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{
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arma_extra_debug_sigprint();
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typedef typename T1::elem_type eT;
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typedef typename T1::pod_type T;
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if(strip_trimat<T1>::do_trimat)
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{
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const strip_trimat<T1> S(X.get_ref());
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const quasi_unwrap<typename strip_trimat<T1>::stored_type> U(S.M);
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arma_debug_check( (U.M.is_square() == false), "rcond(): matrix must be square sized" );
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const uword layout = (S.do_triu) ? uword(0) : uword(1);
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return auxlib::rcond_trimat(U.M, layout);
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}
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Mat<eT> A = X.get_ref();
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arma_debug_check( (A.is_square() == false), "rcond(): matrix must be square sized" );
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if(A.is_empty()) { return Datum<T>::inf; }
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const bool is_triu = trimat_helper::is_triu(A);
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const bool is_tril = (is_triu) ? false : trimat_helper::is_tril(A);
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if(is_triu || is_tril)
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{
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const uword layout = (is_triu) ? uword(0) : uword(1);
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return auxlib::rcond_trimat(A, layout);
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}
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#if defined(ARMA_OPTIMISE_SYMPD)
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const bool try_sympd = auxlib::crippled_lapack(A) ? false : sympd_helper::guess_sympd_anysize(A);
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#else
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const bool try_sympd = false;
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#endif
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if(try_sympd)
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{
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bool calc_ok = false;
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const T out_val = auxlib::rcond_sympd(A, calc_ok);
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if(calc_ok) { return out_val; }
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// auxlib::rcond_sympd() may have failed because A isn't really sympd
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// restore A, as auxlib::rcond_sympd() may have destroyed it
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A = X.get_ref();
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// fallthrough to the next return statement
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}
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return auxlib::rcond(A);
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}
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//! @}
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