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74 lines
1.9 KiB
C++
74 lines
1.9 KiB
C++
#pragma once
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//
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// FILE: Prandom.h
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// AUTHOR: Rob dot Tillaart at gmail dot com
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// VERSION: 0.1.4
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// PURPOSE: Arduino library for random numbers with Python Random interface
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// The underlying pseudo-random number generator is a
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// Multiply-with-carry method invented by George Marsaglia.
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// URL: https://github.com/RobTillaart/Prandom
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// https://docs.python.org/3/library/random.html
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// https://www.pcg-random.org/
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#include "Arduino.h"
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#define PRANDOM_LIB_VERSION (F("0.1.4"))
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class Prandom
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{
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public:
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Prandom();
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Prandom(uint32_t s);
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void seed();
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void seed(uint32_t s, uint32_t t = 2); // Marsaglia need 2 seeds, but 1 will work too
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// integer methods
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//
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uint32_t getrandbits(uint8_t n);
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uint32_t randrange(uint32_t stop);
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uint32_t randrange(uint32_t start, uint32_t stop, uint32_t step = 1);
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// randint is inclusive end value
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uint32_t randint(uint32_t start, uint32_t stop) { return randrange(start, stop + 1); };
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// real distributions
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//
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float random(const float top = 1.0);
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float uniform(float lo, float hi);
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float triangular(float lo = 0, float hi = 1.0, float mid = 0.5);
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float normalvariate(float mu = 0, float sigma = 1.0);
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float lognormvariate(float mu = 0, float sigma = 1.0);
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float gauss(float mu = 0, float sigma = 1.0);
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float expovariate(float lambda);
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float gammavariate(float alpha, float beta);
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float betavariate(float alpha, float beta);
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float paretovariate(float alpha);
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float weibullvariate(float alpha, float beta);
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// Circular distributions
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//
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// mu is mean angle in radians
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// kappa is concentration parameter, 0 -> uniform.
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float vonmisesvariate(float mu, float kappa = 0);
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private:
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uint32_t _rndTime();
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uint32_t _rnd(uint32_t n);
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// Marsaglia 'constants'
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uint32_t _m_w = 1;
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uint32_t _m_z = 2;
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uint32_t __random();
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};
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// -- END OF FILE --
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