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// -*- mode: C++; c-indent-level: 4; c-basic-offset: 4; tab-width: 4 -*-
//
// rnbinom_mu.h: Rcpp R/C++ interface class library --
//
// Copyright (C) 2010 - 2011 Douglas Bates, 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/>.
#ifndef Rcpp__stats__random_rnbinom_mu_h
#define Rcpp__stats__random_rnbinom_mu_h
namespace Rcpp {
namespace stats {
class NBinomGenerator_Mu : public ::Rcpp::Generator<double> {
public:
NBinomGenerator_Mu( double siz_, double mu_ ) :
siz(siz_), lambda( mu_ / siz_ ) {}
inline double operator()() const {
return ::Rf_rpois( ::Rf_rgamma( siz, lambda ) ) ;
}
private:
double siz ;
double lambda ;
} ;
} // stats
} // Rcpp
#endif
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