Visual Servoing Platform  version 3.1.0
vpUniRand.h
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30  *
31  * Description:
32  * Generation of random number with uniform and normal probability density.
33  *
34  * Authors:
35  * Eric Marchand
36  *
37  *****************************************************************************/
38 
39 #ifndef vpUniRand_hh
40 #define vpUniRand_hh
41 
42 #include <visp3/core/vpConfig.h>
43 
65 class VISP_EXPORT vpUniRand
66 {
67  long a;
68  long m; // 2^31-1
69  long q; // integer part of m/a
70  long r; // r=m mod a
71  double normalizer; // we use a normalizer > m to ensure ans will never be 1
72  // (it is the case if x = 739806647)
73 
74 private:
75  void draw0();
76 
77 protected:
78  long x;
79  double draw1();
80 
81 public:
83  explicit vpUniRand(const long seed = 0)
84  : a(16807), m(2147483647), q(127773), r(2836), normalizer(2147484721.0), x((seed) ? seed : 739806647)
85  {
86  }
87 
89  virtual ~vpUniRand(){};
90 
92  double operator()() { return draw1(); }
93 };
94 
95 #endif
virtual ~vpUniRand()
Default destructor.
Definition: vpUniRand.h:89
vpUniRand(const long seed=0)
Default constructor.
Definition: vpUniRand.h:83
double operator()()
Operator that allows to get a random value.
Definition: vpUniRand.h:92
long x
Definition: vpUniRand.h:78
Class for generating random numbers with uniform probability density.
Definition: vpUniRand.h:65