complex.cpp

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// -*- mode: C++; c-indent-level: 4; c-basic-offset: 4; tab-width: 8 -*-
//
// complex.cpp : Rcpp R/C++ interface class library -- complex binary operators
//
// Copyright (C) 2010 - 2011 Dirk Eddelbuettel and Romain Francois
//
// This file is part of Rcpp.
//
// Rcpp 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.
//
// Rcpp 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 Rcpp.  If not, see <http://www.gnu.org/licenses/>.

#include <RcppCommon.h>

Rcomplex operator*( const Rcomplex& lhs, const Rcomplex& rhs){          
    Rcomplex y ;
    y.r = lhs.r * rhs.r - lhs.i * rhs.i ;
    y.i = lhs.r * rhs.i + rhs.r * lhs.i ;
    return y ;
}
Rcomplex operator+( const Rcomplex& lhs, const Rcomplex& rhs){
    Rcomplex y ;
    y.r = lhs.r + rhs.r ;
    y.i = lhs.i + rhs.i ;
    return y ;
}

Rcomplex operator-( const Rcomplex& lhs, const Rcomplex& rhs){
    Rcomplex y ;
    y.r = lhs.r - rhs.r ;
    y.i = lhs.i - rhs.i ;
    return y ;
}
   
Rcomplex operator/( const Rcomplex& a, const Rcomplex& b){

        Rcomplex c ;
    double ratio, den;
    double abr, abi;

    if( (abr = b.r) < 0)
        abr = - abr;
    if( (abi = b.i) < 0)
        abi = - abi;
    if( abr <= abi ) {
        ratio = b.r / b.i ;
        den = b.i * (1 + ratio*ratio);
        c.r = (a.r*ratio + a.i) / den;
        c.i = (a.i*ratio - a.r) / den;
    }
    else {
        ratio = b.i / b.r ;
        den = b.r * (1 + ratio*ratio);
        c.r = (a.r + a.i*ratio) / den;
        c.i = (a.i - a.r*ratio) / den;
    }
    return c ;

}