Rcpp Version 0.12.12
rnbinom_mu.h
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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 //
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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