ope_pow.cpp

/*
    Copyright 2017 Philippe Grandclement
 
    This file is part of Kadath.
 
    Kadath 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.
 
    Kadath 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 Kadath.  If not, see <http://www.gnu.org/licenses/>.
*/
 
#include "ope_eq.hpp"
#include "scalar.hpp"
#include "tensor_impl.hpp"
namespace Kadath {
Ope_pow::Ope_pow (const System_of_eqs*zesys, int nn, Ope_eq* target) : Ope_eq(zesys,target->get_dom(), 1), power(nn) {
    parts[0] = target ;
}
 
Ope_pow::~Ope_pow() {
}
 
Term_eq Ope_pow::action() const {
    if (power==0) 
        return Term_eq (dom, 1., 0.) ;
    else {
        Term_eq res_p0 (parts[0]->action()) ;
        // Check of type and valence :
        //int valence = res_p0.get_val_t().get_valence() ;
        //if (valence !=0) {
        if (res_p0.get_type_data()==TERM_T and res_p0.get_p_val_t()->get_valence() !=0) {
            cerr << "Ope_pow only defined for scalars" << endl ;
            abort() ;
        }
        Term_eq auxi (dom, res_p0.get_type_data()) ;
        auxi = (power>0) ? res_p0 : Term_eq(dom, 1., 0.) / res_p0 ;
        Term_eq res (auxi) ;
        for (int i=1 ; i<fabs(power) ; i++)
            res = res * auxi ;
        return res ;
    }
}
}