random_numbers.cpp
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34 
35 /* Author: Ioan Sucan */
36 
38 
39 #include <boost/random/lagged_fibonacci.hpp>
40 #include <boost/random/uniform_int.hpp>
41 #include <boost/thread/mutex.hpp>
42 #include <boost/date_time/posix_time/posix_time.hpp>
43 #include <boost/math/constants/constants.hpp>
44 #include <boost/scoped_ptr.hpp>
45 
46 static boost::uint32_t first_seed_ = 0;
47 
49 static boost::uint32_t firstSeed(void)
50 {
51  boost::scoped_ptr<int> mem(new int());
52  first_seed_ = (boost::uint32_t)(
53  (boost::posix_time::microsec_clock::universal_time() - boost::posix_time::ptime(boost::date_time::min_date_time))
54  .total_microseconds() +
55  (unsigned long long)(mem.get()));
56  return first_seed_;
57 }
58 
62 static boost::uint32_t nextSeed(void)
63 {
64  static boost::mutex rngMutex;
65  boost::mutex::scoped_lock slock(rngMutex);
66  static boost::lagged_fibonacci607 sGen(firstSeed());
67  static boost::uniform_int<> sDist(1, 1000000000);
68  static boost::variate_generator<boost::lagged_fibonacci607&, boost::uniform_int<> > s(sGen, sDist);
69  boost::uint32_t v = s();
70  return v;
71 }
72 
74  : generator_(nextSeed())
75  , uniDist_(0, 1)
76  , normalDist_(0, 1)
77  , uni_(generator_, uniDist_)
78  , normal_(generator_, normalDist_)
79 {
80 }
81 
83  : generator_(seed), uniDist_(0, 1), normalDist_(0, 1), uni_(generator_, uniDist_), normal_(generator_, normalDist_)
84 {
85  // Because we manually specified a seed, we need to save it ourselves
86  first_seed_ = seed;
87 }
88 
89 // From: "Uniform Random Rotations", Ken Shoemake, Graphics Gems III,
90 // pg. 124-132
92 {
93  double x0 = uni_();
94  double r1 = sqrt(1.0 - x0), r2 = sqrt(x0);
95  double t1 = 2.0 * boost::math::constants::pi<double>() * uni_(),
96  t2 = 2.0 * boost::math::constants::pi<double>() * uni_();
97  double c1 = cos(t1), s1 = sin(t1);
98  double c2 = cos(t2), s2 = sin(t2);
99  value[0] = s1 * r1;
100  value[1] = c1 * r1;
101  value[2] = s2 * r2;
102  value[3] = c2 * r2;
103 }
104 
106 {
107  return first_seed_;
108 }
random_numbers.h
random_numbers::RandomNumberGenerator::quaternion
void quaternion(double value[4])
Uniform random unit quaternion sampling. The computed value has the order (x,y,z,w)
Definition: random_numbers.cpp:91
first_seed_
static boost::uint32_t first_seed_
Definition: random_numbers.cpp:46
firstSeed
static boost::uint32_t firstSeed(void)
Compute the first seed to be used; this function should be called only once.
Definition: random_numbers.cpp:49
nextSeed
static boost::uint32_t nextSeed(void)
Definition: random_numbers.cpp:62
random_numbers::RandomNumberGenerator::getFirstSeed
boost::uint32_t getFirstSeed()
Allow the randomly generated seed to be saved so that experiments / benchmarks can be recreated in th...
Definition: random_numbers.cpp:105
random_numbers::RandomNumberGenerator::RandomNumberGenerator
RandomNumberGenerator(void)
Constructor. Always sets a "random" random seed.
Definition: random_numbers.cpp:73


random_numbers
Author(s): Ioan Sucan
autogenerated on Tue Jun 22 2021 07:30:43