myHistogram = boost/Random + map
Jul 5, 2012 at 7:15am UTC
The project is compile but something wrong in switch case loop. The amount of numbers counting uncorrect. Please take a look to print screen. What I did wrong . Many thanks in advance.
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//
#include <boost/random.hpp> // Convenience header file
#include <iostream>
#include <ctime> // std::time
#include <boost/Random/detail/const_mod.hpp> // LCG class
#include <map>
using namespace std;
template <class PRNG, class Dist>
inline boost::variate_generator<PRNG&, Dist> make_gen(PRNG & rng, Dist d)
{
return boost::variate_generator<PRNG&, Dist>(rng, d);
}
int main()
{
// Get random number generator
boost::mt19937 rng;
// Set the seed.
rng.seed(static_cast <boost::uint32_t> (std::time(0)));
boost::random::uniform_int_distribution<int > six(1,6);
rng.seed(static_cast <unsigned int > (std::time(0)));
boost::variate_generator<boost::mt19937&, boost::random::uniform_int_distribution<int > >
uniRng(rng, six);
map<int , long > myHistogram;
myHistogram[1] = 0;
myHistogram[2] = 0;
myHistogram[3] = 0;
myHistogram[4] = 0;
myHistogram[5] = 0;
myHistogram[6] = 0;
for (int n = 0; n <5; ++n)
{
switch (uniRng())
{
case 1: myHistogram[1]++; break ;
case 2: myHistogram[2]++; break ;
case 3: myHistogram[3]++; break ;
case 4: myHistogram[4]++; break ;
case 5: myHistogram[5]++; break ;
default : myHistogram[6]++; break ;
}
cout << uniRng() << endl;
}
for (auto i = myHistogram.cbegin(); i != myHistogram.cend(); ++i)
{
cout <<"case:" << i->first << " frequency: " <<i->second<<" " << endl;
}
return 0;
}
Jul 5, 2012 at 10:11am UTC
The amount of numbers counting uncorrect.
What does that mean?
On line 25: why do you seed it twice?
On line 38: Are you aware that you feed
myHistogram
with just 5 values?
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