gaussiancopula.cpp

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/* -*- mode: c++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
 
/*
 Copyright (C) 2008 Marek Glowacki
 
 This file is part of QuantLib, a free-software/open-source library
 for financial quantitative analysts and developers - http://quantlib.org/
 
 QuantLib is free software: you can redistribute it and/or modify it
 under the terms of the QuantLib license.  You should have received a
 copy of the license along with this program; if not, please email
 <quantlib-dev@lists.sf.net>. The license is also available online at
 <http://quantlib.org/license.shtml>.
 
 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 license for more details.
*/
 
#include <ql/math/copulas/gaussiancopula.hpp>
 
namespace QuantLib {
 
    GaussianCopula::GaussianCopula(Real rho)
    : rho_(rho), bivariate_normal_cdf_(rho_)
    {
        QL_REQUIRE(rho>=-1.0 && rho<= 1.00,
                   "rho (" << rho << ") must be in [-1,1]");
    }
    
    Real GaussianCopula::operator()(Real x, Real y) const 
    {
        QL_REQUIRE(x >= 0.0 && x <=1.0 ,
                   "1st argument (" << x << ") must be in [0,1]");
        QL_REQUIRE(y >= 0.0 && y <=1.0 ,
                   "2nd argument (" << y << ") must be in [0,1]");
        return bivariate_normal_cdf_(invCumNormal_(x), invCumNormal_(y));
    }
 
}