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/***************************************************************************
* Copyright (C) 2009 by Gunter Weiss, Bui Quang Minh, Arndt von Haeseler *
* minh.bui@univie.ac.at *
* *
* This program 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 2 of the License, or *
* (at your option) any later version. *
* *
* This program 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 this program; if not, write to the *
* Free Software Foundation, Inc., *
* 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. *
***************************************************************************/
#ifndef EIGEN_SYM_H
#define EIGEN_SYM_H
#define NUM_STATE 4
#define ZERO 0.000001
typedef double DVec20[NUM_STATE];
typedef DVec20 DMat20[NUM_STATE];
/**
computing eigenvalues and eigenvectors of matrix Pi_vec^(-1) * H_mat, where H_mat is a
symmetric matrix
@param H_mat (IN)
@param Pi_vec (IN)
@param n (IN) size of matrix
@param eval (OUT) eigenvalues
@param evec (OUT) eigenvectors
@param inv_evec (OUT) inverse matrix of eigenvectors
*/
int eigen_sym(DMat20 H_mat, DVec20 Pi_vec, int num_state,
DVec20 eval, DMat20 evec, DMat20 inv_evec);
int eigen_sym_core(double *mat, int n, double *eval);
#endif
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