Rcpp Version 1.0.9
rnbinom_mu.h
Go to the documentation of this file.
1 // -*- mode: C++; c-indent-level: 4; c-basic-offset: 4; indent-tabs-mode: nil; -*-
2 //
3 // rnbinom_mu.h: Rcpp R/C++ interface class library --
4 //
5 // Copyright (C) 2010 - 2016 Douglas Bates, Dirk Eddelbuettel and Romain Francois
6 //
7 // This file is part of Rcpp.
8 //
9 // Rcpp is free software: you can redistribute it and/or modify it
10 // under the terms of the GNU General Public License as published by
11 // the Free Software Foundation, either version 2 of the License, or
12 // (at your option) any later version.
13 //
14 // Rcpp is distributed in the hope that it will be useful, but
15 // WITHOUT ANY WARRANTY; without even the implied warranty of
16 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 // GNU General Public License for more details.
18 //
19 // You should have received a copy of the GNU General Public License
20 // along with Rcpp. If not, see <http://www.gnu.org/licenses/>.
21 
22 #ifndef Rcpp__stats__random_rnbinom_mu_h
23 #define Rcpp__stats__random_rnbinom_mu_h
24 
25 namespace Rcpp {
26 namespace stats {
27 
28 class NBinomGenerator_Mu : public ::Rcpp::Generator<double> {
29 public:
30 
31  NBinomGenerator_Mu( double siz_, double mu_ ) :
32  siz(siz_), lambda( mu_ / siz_ ) {}
33 
34  inline double operator()() const {
35  return ::Rf_rpois( ::Rf_rgamma( siz, lambda ) ) ;
36  }
37 
38 private:
39  double siz ;
40  double lambda ;
41 };
42 
43 } // stats
44 } // Rcpp
45 
46 #endif
NBinomGenerator_Mu(double siz_, double mu_)
Definition: rnbinom_mu.h:31
Rcpp API.
Definition: algo.h:28