LU_HELPER.h

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// This file is part of Wavelet Turbulence.
// 
// Wavelet Turbulence 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.
// 
// Wavelet Turbulence 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 Wavelet Turbulence.  If not, see <http://www.gnu.org/licenses/>.
// 
// Copyright 2008 Theodore Kim and Nils Thuerey
// 
// Modified to not require TNT matrix library anymore. It was very slow
// when being run in parallel. Required TNT JAMA:LU libraries were
// converted into independent functions.
//      - MiikaH

#ifndef LU_HELPER_H
#define LU_HELPER_H

#include <cmath>
#include <algorithm>

using namespace std;

// Helper function, compute eigenvalues of 3x3 matrix

struct sLU
{
    float values[3][3];
    int pivsign;
    int piv[3];
};


int isNonsingular (sLU LU_);
sLU computeLU( float a[3][3]);
void solveLU3x3(sLU& A, float x[3], float b[3]);


#endif