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/*
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 * conjugate_gradient.h
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 *
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 * Copyright 2006 Nathan Hurst <njh@mail.csse.monash.edu.au>
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 *
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 * This library is free software; you can redistribute it and/or
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 * modify it either under the terms of the GNU Lesser General Public
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 * License version 2.1 as published by the Free Software Foundation
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 * (the "LGPL") or, at your option, under the terms of the Mozilla
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 * Public License Version 1.1 (the "MPL"). If you do not alter this
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 * notice, a recipient may use your version of this file under either
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 * the MPL or the LGPL.
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 *
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 * You should have received a copy of the LGPL along with this library
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 * in the file COPYING-LGPL-2.1; if not, write to the Free Software
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 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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 * You should have received a copy of the MPL along with this library
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 * in the file COPYING-MPL-1.1
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 *
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 * The contents of this file are subject to the Mozilla Public License
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 * Version 1.1 (the "License"); you may not use this file except in
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 * compliance with the License. You may obtain a copy of the License at
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 * http://www.mozilla.org/MPL/
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 *
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 * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY
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 * OF ANY KIND, either express or implied. See the LGPL or the MPL for
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 * the specific language governing rights and limitations.
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 *
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 */
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#ifndef _CONJUGATE_GRADIENT_H
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#define _CONJUGATE_GRADIENT_H
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#include <valarray>
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double
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inner(std::valarray<double> const &x,
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      std::valarray<double> const &y);
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void
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conjugate_gradient(std::valarray<double> const &A,
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                   std::valarray<double> &x,
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                   std::valarray<double> const &b,
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                   unsigned n, double tol,
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                   unsigned max_iterations, bool ortho1);
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#endif // _CONJUGATE_GRADIENT_H