114 lines
2.9 KiB
C++
114 lines
2.9 KiB
C++
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// Copyright (C) 2013-2014 National ICT Australia (NICTA)
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//
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// This Source Code Form is subject to the terms of the Mozilla Public
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// License, v. 2.0. If a copy of the MPL was not distributed with this
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// file, You can obtain one at http://mozilla.org/MPL/2.0/.
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// -------------------------------------------------------------------
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//
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// Written by Conrad Sanderson - http://conradsanderson.id.au
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// Written by Ryan Curtin
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//! \addtogroup fn_eigs_sym
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//! @{
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//! eigenvalues of symmetric real sparse matrix X
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template<typename T1>
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inline
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Col<typename T1::pod_type>
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eigs_sym
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(
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const SpBase<typename T1::elem_type,T1>& X,
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const uword n_eigvals,
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const char* form = "lm",
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const typename T1::elem_type tol = 0.0,
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const typename arma_real_only<typename T1::elem_type>::result* junk = 0
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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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Mat<typename T1::elem_type> eigvec;
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Col<typename T1::pod_type > eigval;
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const bool status = sp_auxlib::eigs_sym(eigval, eigvec, X, n_eigvals, form, tol);
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if(status == false)
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{
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eigval.reset();
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arma_bad("eigs_sym(): decomposition failed");
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}
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return eigval;
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}
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//! eigenvalues of symmetric real sparse matrix X
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template<typename T1>
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inline
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bool
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eigs_sym
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(
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Col<typename T1::pod_type >& eigval,
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const SpBase<typename T1::elem_type,T1>& X,
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const uword n_eigvals,
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const char* form = "lm",
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const typename T1::elem_type tol = 0.0,
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const typename arma_real_only<typename T1::elem_type>::result* junk = 0
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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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Mat<typename T1::elem_type> eigvec;
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const bool status = sp_auxlib::eigs_sym(eigval, eigvec, X, n_eigvals, form, tol);
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if(status == false)
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{
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eigval.reset();
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arma_debug_warn("eigs_sym(): decomposition failed");
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}
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return status;
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}
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//! eigenvalues and eigenvectors of symmetric real sparse matrix X
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template<typename T1>
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inline
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bool
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eigs_sym
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(
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Col<typename T1::pod_type >& eigval,
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Mat<typename T1::elem_type>& eigvec,
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const SpBase<typename T1::elem_type,T1>& X,
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const uword n_eigvals,
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const char* form = "lm",
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const typename T1::elem_type tol = 0.0,
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const typename arma_real_only<typename T1::elem_type>::result* junk = 0
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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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arma_debug_check( void_ptr(&eigval) == void_ptr(&eigvec), "eigs_sym(): paramater 'eigval' is an alias of parameter 'eigvec'" );
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const bool status = sp_auxlib::eigs_sym(eigval, eigvec, X, n_eigvals, form, tol);
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if(status == false)
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{
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eigval.reset();
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arma_debug_warn("eigs_sym(): decomposition failed");
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}
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return status;
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}
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//! @}
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