mapping.hh

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/*!
 *
 * Copyright (C) 2015 Technical University of Liberec.  All rights reserved.
 * 
 * This program is free software; you can redistribute it and/or modify it under
 * the terms of the GNU General Public License version 3 as published by the
 * Free Software Foundation. (http://www.gnu.org/licenses/gpl-3.0.en.html)
 * 
 * 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.
 *
 * 
 * @file    mapping.hh
 * @brief   Class Mapping calculates data related to the mapping
 *          of the reference cell to the actual cell, such as Jacobian
 *          and normal vectors.
 * @author  Jan Stebel
 */

#ifndef MAPPING_HH_
#define MAPPING_HH_

#include <armadillo>
#include <vector>
#include "system/fmt/posix.h"           // for FMT_UNUSED






/**
 * @brief Calculates determinant of a rectangular matrix.
 */
template<class T>
double determinant(const T &M);


template<> inline double determinant(const arma::mat::fixed<1,2> &M)
{
    return sqrt(M(0,0)*M(0,0)+M(0,1)*M(0,1));
}

template<> inline double determinant(const arma::mat::fixed<2,1> &M)
{
    return sqrt(M(0,0)*M(0,0)+M(1,0)*M(1,0));
}

template<> inline double determinant(FMT_UNUSED const arma::mat::fixed<0,3> &M)
{
    return 0;
}

template<> inline double determinant(FMT_UNUSED const arma::mat::fixed<3,0> &M)
{
    return 0;
}

template<> inline double determinant(const arma::mat::fixed<1,3> &M)
{
    return sqrt(M(0,0)*M(0,0)+M(0,1)*M(0,1)+M(0,2)*M(0,2));
}

template<> inline double determinant(const arma::mat::fixed<3,1> &M)
{
    return sqrt(M(0,0)*M(0,0)+M(1,0)*M(1,0)+M(2,0)*M(2,0));
}

template<> inline double determinant(const arma::mat::fixed<2,3> &M)
{
    return sqrt((M(0,0)*M(0,0)+M(0,1)*M(0,1)+M(0,2)*M(0,2))*(M(1,0)*M(1,0)+M(1,1)*M(1,1)+M(1,2)*M(1,2))
               -(M(0,0)*M(1,0)+M(0,1)*M(1,1)+M(0,2)*M(1,2))*(M(0,0)*M(1,0)+M(0,1)*M(1,1)+M(0,2)*M(1,2)));
}

template<> inline double determinant(const arma::mat::fixed<3,2> &M)
{
    return sqrt((M(0,0)*M(0,0)+M(1,0)*M(1,0)+M(2,0)*M(2,0))*(M(0,1)*M(0,1)+M(1,1)*M(1,1)+M(2,1)*M(2,1))
               -(M(0,0)*M(0,1)+M(1,0)*M(1,1)+M(2,0)*M(2,1))*(M(0,0)*M(0,1)+M(1,0)*M(1,1)+M(2,0)*M(2,1)));
}

template<arma::uword n> inline double determinant(const arma::mat::fixed<n,n> &M)
{
    return det(M);
}






#endif /* MAPPING_HH_ */