random_util.cpp

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// -*- mode: c++ -*-
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#include "jsk_recognition_utils/random_util.h"
#include <iostream>

namespace jsk_recognition_utils
{
  double randomGaussian(double mean, double var, boost::mt19937& gen)
  {
    if (var == 0.0) {
      return mean;
    }
    else {  
      boost::normal_distribution<> dst(mean, sqrt(var));
      boost::variate_generator<
        boost::mt19937&,
        boost::normal_distribution<> > rand(gen, dst);
      return rand();
    }
  }
  
  double randomUniform(double min, double max, boost::mt19937& gen)
  {
    // Ensure min < max
    double amin = std::min(min, max);
    double amax = std::max(min, max);
    boost::uniform_real<> dst(amin, amax);
    boost::variate_generator<
      boost::mt19937&,
      boost::uniform_real<> > rand(gen, dst);
    return rand();
  }
}