Re: [boost] How to generate a Bernuolli number

Subject: Re: [boost] How to generate a Bernuolli number
From: Barco You (barcojie_at_[hidden])
Date: 2009-03-31 03:18:04

Hi,

Sorry, wait!!!
int main() {
  double p = 0.5;
  boost::mt19937 rng;
  boost::bernoulli_distribution<> d(p);
  boost::variate_generator<
      boost::mt19937&,
      boost::bernoulli_distribution<>
  > g(rng, d);

  for(int i = 0; i < 10; ++i) {
      std::cout << g() << std::endl;
  }
}

This really works. but If I write this in a function:
int genB() {
  double p = 0.5;
  boost::mt19937 rng;
  boost::bernoulli_distribution<> d(p);
  boost::variate_generator<
      boost::mt19937&,
      boost::bernoulli_distribution<>
  > g(rng, d);

  return g() ;
}

int main(){
   for(int i = 0; i < 10; ++i) {
      std::cout << genB() << std::endl;
  }
}

I'll got always 0.... Why?

On Tue, Mar 31, 2009 at 2:06 PM, Barco You <barcojie_at_[hidden]> wrote:

> Hi Steven,
>
> Fine now!
> Thanks a lot!
>
>
> On Tue, Mar 31, 2009 at 11:11 AM, Steven Watanabe <watanabesj_at_[hidden]>wrote:
>
>> AMDG
>>
>> Barco You wrote:
>>
>>> I call it 1000 time, and all output is 0.
>>>
>>>
>>
>> Works for me...
>>
>> #include <boost/random.hpp>
>> #include <iostream>
>>
>> int main() {
>>   double p = 0.5;
>>   boost::mt19937 rng;
>>   boost::bernoulli_distribution<> d(p);
>>   boost::variate_generator<
>>       boost::mt19937&,
>>       boost::bernoulli_distribution<>
>>   > g(rng, d);
>>
>>   for(int i = 0; i < 10; ++i) {
>>       std::cout << g() << std::endl;
>>
>>   }
>> }
>>
>> In Christ,
>> Steven Watanabe
>>
>> _______________________________________________
>> Unsubscribe & other changes:
>> http://lists.boost.org/mailman/listinfo.cgi/boost
>>
>
>
>
> --
> -------------------------------
> Enjoy life!
> Barco You
>

-- 
-------------------------------
Enjoy life!
Barco You