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/***********************************************************************
* Copyright (C) 2002,2003,2004,2005,2006,2007,2008 Carsten Urbach
*
* This file is part of tmLQCD.
*
* tmLQCD 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 of the License, or
* (at your option) any later version.
*
* tmLQCD 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 tmLQCD. If not, see <http://www.gnu.org/licenses/>.
***********************************************************************/

/****************************************************
* Minimal residual solver
* int mr(spinor * const P, spinor * const Q,
* const int max_iter, const double eps_sq,
* matrix_mult f){ *
*
* returns the number of iterations needed to reach
* the desired precision. return -1 if the maximal
* number of iterations was reached.
*
* Inout:
* spinor * P : guess for the solving spinor
* Input:
* spinor * Q : source spinor
* int max_iter : maximal number of iterations
* double eps_sqr : stopping criterium
* matrix_mult f : pointer to a function containing
* the matrix mult for type
* matrix_mult see
* matrix_mult_typedef.h
*
* Autor: Carsten Urbach <urbach@ifh.de>
*
****************************************************/

#ifndef _MR_H
#define _MR_H

int mr(spinor * const P, spinor * const Q,
       const int max_iter, const double eps_sq,
       const int rel_prec, const int N,
       const int parallel, matrix_mult f);

int mrblk(spinor * const P, spinor * const Q,
const int max_iter, const double eps_sq,
const int rel_prec, const int N,
matrix_mult_blk f, const int blk);

#endif
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