solver_common.cc
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	/**
	* file solver_common.cc
	*
	* @author Till Junge <till.junge@epfl.ch>
	*
	* @date 15 May 2018
	*
	* @brief implementation for solver utilities
	*
	* @section LICENSE
	*
	* Copyright © 2018 Till Junge
	*
	* µSpectre is free software; you can redistribute it and/or
	* modify it under the terms of the GNU General Public License as
	* published by the Free Software Foundation, either version 3, or (at
	* your option) any later version.
	*
	* µSpectre is distributed in the hope that it will be useful, but
	* WITHOUT ANY WARRANTY; without even the implied warranty of
	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	* General Public License for more details.
	*
	* You should have received a copy of the GNU General Public License
	* along with GNU Emacs; see the file COPYING. If not, write to the
	* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
	* Boston, MA 02111-1307, USA.
	*/

	#include "solver/solver_common.hh"
	namespace muSpectre {

	/* ---------------------------------------------------------------------- */
	bool check_symmetry(const Eigen::Ref<const Eigen::ArrayXXd>& eps,
	Real rel_tol){
	return (rel_tol >= (eps-eps.transpose()).matrix().norm()/eps.matrix().norm() \|\|
	rel_tol >= eps.matrix().norm());
	}

	} // muSpectre