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# work/mixpp/bdm/itpp_ext.h

    00001 //
    00002 // C++ Interface: itpp_ext
    00003 //
    00004 // Description:
    00005 //
    00006 //
    00007 // Author: smidl <smidl@utia.cas.cz>, (C) 2008
    00008 //
    00009 // Copyright: See COPYING file that comes with this distribution
    00010 //
    00011 //
    00012 #include <itpp/itbase.h>
    00013
    00014 using std::cout;
    00015 using std::endl;
    00016
    00017 namespace itpp {
    00018         Array<int> to_Arr(const ivec &indices);
    00019
    00024   class Gamma_RNG {
    00025   public:
    00027     Gamma_RNG(double a=1.0, double b=1.0);
    00029     void setup(double a0, double b0) { alpha=a0; beta=b0;}
    00031     double get_setup() const;
    00033     double operator()() { return sample(); }
    00035     vec operator()(int n);
    00037     mat operator()(int h, int w);
    00038   protected:
    00039   private:
    00041     double sample();
    00043     double alpha;
    00045     double beta;
    00047     Random_Generator RNG;
    00048     Normal_RNG NRNG;
    00050     inline double exp_rand(){return -std::log(RNG.random_01());}
    00051     inline double unif_rand(){return RNG.random_01();}
    00052     inline double norm_rand(){return NRNG.sample();}
    00053
    00054   };
    00055
    00056
    00057 }