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#include <vector> |
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namespace oopse { |
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|
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class MTRand { |
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// Data |
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public: |
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typedef unsigned long uint32; // unsigned integer type, at least 32 bits |
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class MTRand { |
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// Data |
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public: |
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typedef unsigned long uint32; // unsigned integer type, at least 32 bits |
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enum { N = 624 }; // length of state vector |
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enum { SAVE = N + 1 }; // length of array for save() |
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enum { N = 624 }; // length of state vector |
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enum { SAVE = N + 1 }; // length of array for save() |
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private: |
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enum { M = 397 }; // period parameter |
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private: |
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enum { M = 397 }; // period parameter |
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uint32 state[N]; // internal state |
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uint32 *pNext; // next value to get from state |
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int left; // number of values left before reload needed |
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int nstrides_; |
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int stride_; |
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uint32 state[N]; // internal state |
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uint32 *pNext; // next value to get from state |
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int left; // number of values left before reload needed |
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int nstrides_; |
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int stride_; |
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|
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//Methods |
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public: |
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MTRand( const uint32& oneSeed, int nstrides = 1, int stride = 0); // initialize with a simple uint32 |
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MTRand( uint32 *const bigSeed, uint32 const seedLength = N, int nstrides = 1, int stride = 0); // or an array |
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MTRand(int nstrides = 1, int stride = 0); // auto-initialize with /dev/urandom or time() and clock() |
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//Methods |
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public: |
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MTRand( const uint32& oneSeed, int nstrides, int stride); // initialize with a simple uint32 |
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MTRand( uint32 *const bigSeed, uint32 const seedLength, int nstrides, int stride); // or an array |
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MTRand(int nstrides, int stride); // auto-initialize with /dev/urandom or time() and clock() |
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// Do NOT use for CRYPTOGRAPHY without securely hashing several returned |
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// values together, otherwise the generator state can be learned after |
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// reading 624 consecutive values. |
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// Do NOT use for CRYPTOGRAPHY without securely hashing several returned |
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// values together, otherwise the generator state can be learned after |
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// reading 624 consecutive values. |
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// Access to 32-bit random numbers |
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double rand(); // real number in [0,1] |
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double rand( const double& n ); // real number in [0,n] |
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double randExc(); // real number in [0,1) |
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double randExc( const double& n ); // real number in [0,n) |
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double randDblExc(); // real number in (0,1) |
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double randDblExc( const double& n ); // real number in (0,n) |
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uint32 randInt(); // integer in [0,2^32-1] (modified for striding) |
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uint32 rawRandInt(); // original randInt |
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uint32 randInt( const uint32& n ); // integer in [0,n] for n < 2^32 |
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double operator()() { return rand(); } // same as rand() |
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// Access to 32-bit random numbers |
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double rand(); // real number in [0,1] |
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double rand( const double& n ); // real number in [0,n] |
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double randExc(); // real number in [0,1) |
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double randExc( const double& n ); // real number in [0,n) |
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double randDblExc(); // real number in (0,1) |
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double randDblExc( const double& n ); // real number in (0,n) |
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uint32 randInt(); // integer in [0,2^32-1] (modified for striding) |
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uint32 rawRandInt(); // original randInt |
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uint32 randInt( const uint32& n ); // integer in [0,n] for n < 2^32 |
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double operator()() { return rand(); } // same as rand() |
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// Access to 53-bit random numbers (capacity of IEEE double precision) |
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double rand53(); // real number in [0,1) |
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// Access to 53-bit random numbers (capacity of IEEE double precision) |
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double rand53(); // real number in [0,1) |
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// Access to nonuniform random number distributions |
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double randNorm( const double& mean = 0.0, const double& variance = 0.0 ); |
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// Access to nonuniform random number distributions |
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double randNorm( const double& mean = 0.0, const double& variance = 0.0 ); |
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// Re-seeding functions with same behavior as initializers |
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void seed( const uint32 oneSeed ); |
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void seed( uint32 *const bigSeed, const uint32 seedLength = N ); |
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void seed(); |
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// Re-seeding functions with same behavior as initializers |
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void seed( const uint32 oneSeed ); |
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void seed( uint32 *const bigSeed, const uint32 seedLength = N ); |
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void seed(); |
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std::vector<uint32>generateSeeds(); |
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std::vector<uint32>generateSeeds(); |
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// Saving and loading generator state |
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void save( uint32* saveArray ) const; // to array of size SAVE |
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void load( uint32 *const loadArray ); // from such array |
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friend std::ostream& operator<<( std::ostream& os, const MTRand& mtrand ); |
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friend std::istream& operator>>( std::istream& is, MTRand& mtrand ); |
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// Saving and loading generator state |
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void save( uint32* saveArray ) const; // to array of size SAVE |
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void load( uint32 *const loadArray ); // from such array |
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friend std::ostream& operator<<( std::ostream& os, const MTRand& mtrand ); |
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friend std::istream& operator>>( std::istream& is, MTRand& mtrand ); |
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protected: |
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void initialize( const uint32 oneSeed ); |
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void reload(); |
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uint32 hiBit( const uint32& u ) const { return u & 0x80000000UL; } |
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uint32 loBit( const uint32& u ) const { return u & 0x00000001UL; } |
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uint32 loBits( const uint32& u ) const { return u & 0x7fffffffUL; } |
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uint32 mixBits( const uint32& u, const uint32& v ) const |
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{ return hiBit(u) | loBits(v); } |
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uint32 twist( const uint32& m, const uint32& s0, const uint32& s1 ) const |
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{ return m ^ (mixBits(s0,s1)>>1) ^ (-loBit(s1) & 0x9908b0dfUL); } |
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static uint32 hash( time_t t, clock_t c ); |
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}; |
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protected: |
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void initialize( const uint32 oneSeed ); |
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void reload(); |
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uint32 hiBit( const uint32& u ) const { return u & 0x80000000UL; } |
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uint32 loBit( const uint32& u ) const { return u & 0x00000001UL; } |
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uint32 loBits( const uint32& u ) const { return u & 0x7fffffffUL; } |
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uint32 mixBits( const uint32& u, const uint32& v ) const |
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{ return hiBit(u) | loBits(v); } |
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uint32 twist( const uint32& m, const uint32& s0, const uint32& s1 ) const |
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{ return m ^ (mixBits(s0,s1)>>1) ^ (-loBit(s1) & 0x9908b0dfUL); } |
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static uint32 hash( time_t t, clock_t c ); |
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}; |
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inline MTRand::MTRand( const uint32& oneSeed, int nstrides, int stride) : nstrides_(nstrides), stride_(stride) { |
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inline MTRand::MTRand( const uint32& oneSeed, int nstrides, int stride) : nstrides_(nstrides), stride_(stride) { |
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assert(stride_ < nstrides_ && stride_ >= 0); |
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seed(oneSeed); |
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} |
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} |
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inline MTRand::MTRand( uint32 *const bigSeed, const uint32 seedLength, int nstrides, int stride) : nstrides_(nstrides), stride_(stride) { |
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inline MTRand::MTRand( uint32 *const bigSeed, const uint32 seedLength, int nstrides, int stride) : nstrides_(nstrides), stride_(stride) { |
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assert(stride_ < nstrides_ && stride_ >= 0); |
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seed(bigSeed,seedLength); |
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} |
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} |
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inline MTRand::MTRand(int nstrides, int stride) : nstrides_(nstrides), stride_(stride){ |
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inline MTRand::MTRand(int nstrides, int stride) : nstrides_(nstrides), stride_(stride){ |
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assert(stride_ < nstrides_ && stride_ >= 0); |
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seed(); |
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} |
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} |
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inline double MTRand::rand() |
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{ return double(randInt()) * (1.0/4294967295.0); } |
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inline double MTRand::rand() |
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{ return double(randInt()) * (1.0/4294967295.0); } |
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inline double MTRand::rand( const double& n ) |
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{ return rand() * n; } |
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inline double MTRand::rand( const double& n ) |
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{ return rand() * n; } |
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inline double MTRand::randExc() |
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{ return double(randInt()) * (1.0/4294967296.0); } |
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inline double MTRand::randExc() |
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{ return double(randInt()) * (1.0/4294967296.0); } |
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inline double MTRand::randExc( const double& n ) |
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{ return randExc() * n; } |
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inline double MTRand::randExc( const double& n ) |
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{ return randExc() * n; } |
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inline double MTRand::randDblExc() |
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{ return ( double(randInt()) + 0.5 ) * (1.0/4294967296.0); } |
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inline double MTRand::randDblExc() |
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{ return ( double(randInt()) + 0.5 ) * (1.0/4294967296.0); } |
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inline double MTRand::randDblExc( const double& n ) |
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{ return randDblExc() * n; } |
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inline double MTRand::randDblExc( const double& n ) |
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{ return randDblExc() * n; } |
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inline double MTRand::rand53() |
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{ |
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uint32 a = randInt() >> 5, b = randInt() >> 6; |
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return ( a * 67108864.0 + b ) * (1.0/9007199254740992.0); // by Isaku Wada |
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} |
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inline double MTRand::rand53() |
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{ |
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uint32 a = randInt() >> 5, b = randInt() >> 6; |
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return ( a * 67108864.0 + b ) * (1.0/9007199254740992.0); // by Isaku Wada |
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} |
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inline double MTRand::randNorm( const double& mean, const double& variance ) |
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{ |
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// Return a real number from a normal (Gaussian) distribution with given |
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// mean and variance by Box-Muller method |
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double r = sqrt( -2.0 * log( 1.0-randDblExc()) ) * variance; |
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double phi = 2.0 * 3.14159265358979323846264338328 * randExc(); |
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return mean + r * cos(phi); |
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} |
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inline double MTRand::randNorm( const double& mean, const double& variance ) |
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{ |
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// Return a real number from a normal (Gaussian) distribution with given |
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// mean and variance by Box-Muller method |
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double r = sqrt( -2.0 * log( 1.0-randDblExc()) ) * variance; |
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double phi = 2.0 * 3.14159265358979323846264338328 * randExc(); |
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return mean + r * cos(phi); |
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} |
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/** |
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* This function is modified from the original to allow for random |
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* streams on parallel jobs. It now takes numbers from by striding |
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* through the random stream and picking up only one of the random |
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* numbers per nstrides_. The number it picks is the stride_'th |
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* number in the stride sequence. |
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*/ |
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inline MTRand::uint32 MTRand::randInt() { |
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/** |
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* This function is modified from the original to allow for random |
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* streams on parallel jobs. It now takes numbers from by striding |
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* through the random stream and picking up only one of the random |
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* numbers per nstrides_. The number it picks is the stride_'th |
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* number in the stride sequence. |
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*/ |
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inline MTRand::uint32 MTRand::randInt() { |
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std::vector<uint32> ranNums(nstrides_); |
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std::vector<uint32> ranNums(nstrides_); |
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for (int i = 0; i < nstrides_; ++i) { |
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ranNums[i] = rawRandInt(); |
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} |
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for (int i = 0; i < nstrides_; ++i) { |
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ranNums[i] = rawRandInt(); |
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} |
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return ranNums[stride_]; |
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} |
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return ranNums[stride_]; |
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} |
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/** |
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* This is the original randInt function which implements the mersenne |
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* twister. |
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*/ |
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inline MTRand::uint32 MTRand::rawRandInt() |
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{ |
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// Pull a 32-bit integer from the generator state |
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// Every other access function simply transforms the numbers extracted here |
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/** |
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* This is the original randInt function which implements the mersenne |
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* twister. |
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*/ |
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inline MTRand::uint32 MTRand::rawRandInt() |
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{ |
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// Pull a 32-bit integer from the generator state |
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// Every other access function simply transforms the numbers extracted here |
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if( left == 0 ) reload(); |
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--left; |
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if( left == 0 ) reload(); |
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--left; |
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register uint32 s1; |
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s1 = *pNext++; |
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s1 ^= (s1 >> 11); |
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s1 ^= (s1 << 7) & 0x9d2c5680UL; |
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s1 ^= (s1 << 15) & 0xefc60000UL; |
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return ( s1 ^ (s1 >> 18) ); |
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} |
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register uint32 s1; |
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s1 = *pNext++; |
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s1 ^= (s1 >> 11); |
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s1 ^= (s1 << 7) & 0x9d2c5680UL; |
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s1 ^= (s1 << 15) & 0xefc60000UL; |
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return ( s1 ^ (s1 >> 18) ); |
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} |
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inline MTRand::uint32 MTRand::randInt( const uint32& n ) |
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{ |
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// Find which bits are used in n |
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// Optimized by Magnus Jonsson (magnus@smartelectronix.com) |
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uint32 used = n; |
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used |= used >> 1; |
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used |= used >> 2; |
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used |= used >> 4; |
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used |= used >> 8; |
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used |= used >> 16; |
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|
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// Draw numbers until one is found in [0,n] |
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uint32 i; |
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do |
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i = randInt() & used; // toss unused bits to shorten search |
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while( i > n ); |
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< |
return i; |
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} |
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|
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|
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inline void MTRand::seed( const uint32 oneSeed ) |
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{ |
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// Seed the generator with a simple uint32 |
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initialize(oneSeed); |
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< |
reload(); |
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} |
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< |
|
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|
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< |
inline void MTRand::seed( uint32 *const bigSeed, const uint32 seedLength ) |
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{ |
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// Seed the generator with an array of uint32's |
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// There are 2^19937-1 possible initial states. This function allows |
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// all of those to be accessed by providing at least 19937 bits (with a |
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< |
// default seed length of N = 624 uint32's). Any bits above the lower 32 |
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// in each element are discarded. |
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< |
// Just call seed() if you want to get array from /dev/urandom |
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< |
initialize(19650218UL); |
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< |
register int i = 1; |
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< |
register uint32 j = 0; |
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< |
register int k = ( N > seedLength ? N : seedLength ); |
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< |
for( ; k; --k ) |
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< |
{ |
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< |
state[i] = |
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< |
state[i] ^ ( (state[i-1] ^ (state[i-1] >> 30)) * 1664525UL ); |
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< |
state[i] += ( bigSeed[j] & 0xffffffffUL ) + j; |
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state[i] &= 0xffffffffUL; |
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++i; ++j; |
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< |
if( i >= N ) { state[0] = state[N-1]; i = 1; } |
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< |
if( j >= seedLength ) j = 0; |
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} |
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< |
for( k = N - 1; k; --k ) |
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{ |
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< |
state[i] = |
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< |
state[i] ^ ( (state[i-1] ^ (state[i-1] >> 30)) * 1566083941UL ); |
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state[i] -= i; |
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state[i] &= 0xffffffffUL; |
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++i; |
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< |
if( i >= N ) { state[0] = state[N-1]; i = 1; } |
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} |
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< |
state[0] = 0x80000000UL; // MSB is 1, assuring non-zero initial array |
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< |
reload(); |
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< |
} |
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< |
|
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< |
|
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< |
inline void MTRand::seed() |
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{ |
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< |
std::vector<uint32> seeds; |
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< |
|
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< |
seeds = generateSeeds(); |
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> |
inline MTRand::uint32 MTRand::randInt( const uint32& n ) |
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{ |
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// Find which bits are used in n |
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// Optimized by Magnus Jonsson (magnus@smartelectronix.com) |
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> |
uint32 used = n; |
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> |
used |= used >> 1; |
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> |
used |= used >> 2; |
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> |
used |= used >> 4; |
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> |
used |= used >> 8; |
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used |= used >> 16; |
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> |
|
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> |
// Draw numbers until one is found in [0,n] |
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> |
uint32 i; |
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> |
do |
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> |
i = randInt() & used; // toss unused bits to shorten search |
| 245 |
> |
while( i > n ); |
| 246 |
> |
return i; |
| 247 |
> |
} |
| 248 |
|
|
| 249 |
< |
if (seeds.size() == 1) { |
| 250 |
< |
seed( seeds[0] ); |
| 251 |
< |
} else { |
| 252 |
< |
seed( &seeds[0], seeds.size() ); |
| 249 |
> |
|
| 250 |
> |
inline void MTRand::seed( const uint32 oneSeed ) |
| 251 |
> |
{ |
| 252 |
> |
// Seed the generator with a simple uint32 |
| 253 |
> |
initialize(oneSeed); |
| 254 |
> |
reload(); |
| 255 |
|
} |
| 305 |
– |
} |
| 256 |
|
|
| 257 |
|
|
| 258 |
< |
inline std::vector<MTRand::uint32> MTRand::generateSeeds() { |
| 259 |
< |
// Seed the generator with an array from /dev/urandom if available |
| 260 |
< |
// Otherwise use a hash of time() and clock() values |
| 258 |
> |
inline void MTRand::seed( uint32 *const bigSeed, const uint32 seedLength ) |
| 259 |
> |
{ |
| 260 |
> |
// Seed the generator with an array of uint32's |
| 261 |
> |
// There are 2^19937-1 possible initial states. This function allows |
| 262 |
> |
// all of those to be accessed by providing at least 19937 bits (with a |
| 263 |
> |
// default seed length of N = 624 uint32's). Any bits above the lower 32 |
| 264 |
> |
// in each element are discarded. |
| 265 |
> |
// Just call seed() if you want to get array from /dev/urandom |
| 266 |
> |
initialize(19650218UL); |
| 267 |
> |
register int i = 1; |
| 268 |
> |
register uint32 j = 0; |
| 269 |
> |
register int k = ( N > seedLength ? N : seedLength ); |
| 270 |
> |
for( ; k; --k ) |
| 271 |
> |
{ |
| 272 |
> |
state[i] = |
| 273 |
> |
state[i] ^ ( (state[i-1] ^ (state[i-1] >> 30)) * 1664525UL ); |
| 274 |
> |
state[i] += ( bigSeed[j] & 0xffffffffUL ) + j; |
| 275 |
> |
state[i] &= 0xffffffffUL; |
| 276 |
> |
++i; ++j; |
| 277 |
> |
if( i >= N ) { state[0] = state[N-1]; i = 1; } |
| 278 |
> |
if( j >= seedLength ) j = 0; |
| 279 |
> |
} |
| 280 |
> |
for( k = N - 1; k; --k ) |
| 281 |
> |
{ |
| 282 |
> |
state[i] = |
| 283 |
> |
state[i] ^ ( (state[i-1] ^ (state[i-1] >> 30)) * 1566083941UL ); |
| 284 |
> |
state[i] -= i; |
| 285 |
> |
state[i] &= 0xffffffffUL; |
| 286 |
> |
++i; |
| 287 |
> |
if( i >= N ) { state[0] = state[N-1]; i = 1; } |
| 288 |
> |
} |
| 289 |
> |
state[0] = 0x80000000UL; // MSB is 1, assuring non-zero initial array |
| 290 |
> |
reload(); |
| 291 |
> |
} |
| 292 |
|
|
| 312 |
– |
std::vector<uint32> bigSeed; |
| 293 |
|
|
| 294 |
< |
// First try getting an array from /dev/urandom |
| 295 |
< |
FILE* urandom = fopen( "/dev/urandom", "rb" ); |
| 296 |
< |
if( urandom ) |
| 297 |
< |
{ |
| 298 |
< |
bigSeed.resize(N); |
| 299 |
< |
register uint32 *s = &bigSeed[0]; |
| 300 |
< |
register int i = N; |
| 301 |
< |
register bool success = true; |
| 302 |
< |
while( success && i-- ) |
| 303 |
< |
success = fread( s++, sizeof(uint32), 1, urandom ); |
| 324 |
< |
fclose(urandom); |
| 325 |
< |
if( success ) { return bigSeed; } |
| 294 |
> |
inline void MTRand::seed() |
| 295 |
> |
{ |
| 296 |
> |
std::vector<uint32> seeds; |
| 297 |
> |
|
| 298 |
> |
seeds = generateSeeds(); |
| 299 |
> |
|
| 300 |
> |
if (seeds.size() == 1) { |
| 301 |
> |
seed( seeds[0] ); |
| 302 |
> |
} else { |
| 303 |
> |
seed( &seeds[0], seeds.size() ); |
| 304 |
|
} |
| 305 |
+ |
} |
| 306 |
+ |
|
| 307 |
+ |
|
| 308 |
+ |
inline std::vector<MTRand::uint32> MTRand::generateSeeds() { |
| 309 |
+ |
// Seed the generator with an array from /dev/urandom if available |
| 310 |
+ |
// Otherwise use a hash of time() and clock() values |
| 311 |
+ |
|
| 312 |
+ |
std::vector<uint32> bigSeed; |
| 313 |
+ |
|
| 314 |
+ |
// First try getting an array from /dev/urandom |
| 315 |
+ |
FILE* urandom = fopen( "/dev/urandom", "rb" ); |
| 316 |
+ |
if( urandom ) |
| 317 |
+ |
{ |
| 318 |
+ |
bigSeed.resize(N); |
| 319 |
+ |
register uint32 *s = &bigSeed[0]; |
| 320 |
+ |
register int i = N; |
| 321 |
+ |
register bool success = true; |
| 322 |
+ |
while( success && i-- ) |
| 323 |
+ |
success = fread( s++, sizeof(uint32), 1, urandom ); |
| 324 |
+ |
fclose(urandom); |
| 325 |
+ |
if( success ) { return bigSeed; } |
| 326 |
+ |
} |
| 327 |
|
|
| 328 |
< |
// Was not successful, so use time() and clock() instead |
| 328 |
> |
// Was not successful, so use time() and clock() instead |
| 329 |
|
|
| 330 |
< |
bigSeed.push_back(hash( time(NULL), clock())); |
| 331 |
< |
return bigSeed; |
| 332 |
< |
} |
| 330 |
> |
bigSeed.push_back(hash( time(NULL), clock())); |
| 331 |
> |
return bigSeed; |
| 332 |
> |
} |
| 333 |
|
|
| 334 |
|
|
| 335 |
< |
inline void MTRand::initialize( const uint32 seed ) |
| 336 |
< |
{ |
| 337 |
< |
// Initialize generator state with seed |
| 338 |
< |
// See Knuth TAOCP Vol 2, 3rd Ed, p.106 for multiplier. |
| 339 |
< |
// In previous versions, most significant bits (MSBs) of the seed affect |
| 340 |
< |
// only MSBs of the state array. Modified 9 Jan 2002 by Makoto Matsumoto. |
| 341 |
< |
register uint32 *s = state; |
| 342 |
< |
register uint32 *r = state; |
| 343 |
< |
register int i = 1; |
| 344 |
< |
*s++ = seed & 0xffffffffUL; |
| 345 |
< |
for( ; i < N; ++i ) |
| 346 |
< |
{ |
| 347 |
< |
*s++ = ( 1812433253UL * ( *r ^ (*r >> 30) ) + i ) & 0xffffffffUL; |
| 348 |
< |
r++; |
| 349 |
< |
} |
| 350 |
< |
} |
| 335 |
> |
inline void MTRand::initialize( const uint32 seed ) |
| 336 |
> |
{ |
| 337 |
> |
// Initialize generator state with seed |
| 338 |
> |
// See Knuth TAOCP Vol 2, 3rd Ed, p.106 for multiplier. |
| 339 |
> |
// In previous versions, most significant bits (MSBs) of the seed affect |
| 340 |
> |
// only MSBs of the state array. Modified 9 Jan 2002 by Makoto Matsumoto. |
| 341 |
> |
register uint32 *s = state; |
| 342 |
> |
register uint32 *r = state; |
| 343 |
> |
register int i = 1; |
| 344 |
> |
*s++ = seed & 0xffffffffUL; |
| 345 |
> |
for( ; i < N; ++i ) |
| 346 |
> |
{ |
| 347 |
> |
*s++ = ( 1812433253UL * ( *r ^ (*r >> 30) ) + i ) & 0xffffffffUL; |
| 348 |
> |
r++; |
| 349 |
> |
} |
| 350 |
> |
} |
| 351 |
|
|
| 352 |
|
|
| 353 |
< |
inline void MTRand::reload() |
| 354 |
< |
{ |
| 355 |
< |
// Generate N new values in state |
| 356 |
< |
// Made clearer and faster by Matthew Bellew (matthew.bellew@home.com) |
| 357 |
< |
register uint32 *p = state; |
| 358 |
< |
register int i; |
| 359 |
< |
for( i = N - M; i--; ++p ) |
| 360 |
< |
*p = twist( p[M], p[0], p[1] ); |
| 361 |
< |
for( i = M; --i; ++p ) |
| 362 |
< |
*p = twist( p[M-N], p[0], p[1] ); |
| 363 |
< |
*p = twist( p[M-N], p[0], state[0] ); |
| 353 |
> |
inline void MTRand::reload() |
| 354 |
> |
{ |
| 355 |
> |
// Generate N new values in state |
| 356 |
> |
// Made clearer and faster by Matthew Bellew (matthew.bellew@home.com) |
| 357 |
> |
register uint32 *p = state; |
| 358 |
> |
register int i; |
| 359 |
> |
for( i = N - M; i--; ++p ) |
| 360 |
> |
*p = twist( p[M], p[0], p[1] ); |
| 361 |
> |
for( i = M; --i; ++p ) |
| 362 |
> |
*p = twist( p[M-N], p[0], p[1] ); |
| 363 |
> |
*p = twist( p[M-N], p[0], state[0] ); |
| 364 |
|
|
| 365 |
< |
left = N, pNext = state; |
| 366 |
< |
} |
| 365 |
> |
left = N, pNext = state; |
| 366 |
> |
} |
| 367 |
|
|
| 368 |
|
|
| 369 |
< |
inline MTRand::uint32 MTRand::hash( time_t t, clock_t c ) |
| 370 |
< |
{ |
| 371 |
< |
// Get a uint32 from t and c |
| 372 |
< |
// Better than uint32(x) in case x is floating point in [0,1] |
| 373 |
< |
// Based on code by Lawrence Kirby (fred@genesis.demon.co.uk) |
| 369 |
> |
inline MTRand::uint32 MTRand::hash( time_t t, clock_t c ) |
| 370 |
> |
{ |
| 371 |
> |
// Get a uint32 from t and c |
| 372 |
> |
// Better than uint32(x) in case x is floating point in [0,1] |
| 373 |
> |
// Based on code by Lawrence Kirby (fred@genesis.demon.co.uk) |
| 374 |
|
|
| 375 |
< |
static uint32 differ = 0; // guarantee time-based seeds will change |
| 375 |
> |
static uint32 differ = 0; // guarantee time-based seeds will change |
| 376 |
|
|
| 377 |
< |
uint32 h1 = 0; |
| 378 |
< |
unsigned char *p = (unsigned char *) &t; |
| 379 |
< |
for( size_t i = 0; i < sizeof(t); ++i ) |
| 380 |
< |
{ |
| 381 |
< |
h1 *= UCHAR_MAX + 2U; |
| 382 |
< |
h1 += p[i]; |
| 383 |
< |
} |
| 384 |
< |
uint32 h2 = 0; |
| 385 |
< |
p = (unsigned char *) &c; |
| 386 |
< |
for( size_t j = 0; j < sizeof(c); ++j ) |
| 387 |
< |
{ |
| 388 |
< |
h2 *= UCHAR_MAX + 2U; |
| 389 |
< |
h2 += p[j]; |
| 390 |
< |
} |
| 391 |
< |
return ( h1 + differ++ ) ^ h2; |
| 392 |
< |
} |
| 377 |
> |
uint32 h1 = 0; |
| 378 |
> |
unsigned char *p = (unsigned char *) &t; |
| 379 |
> |
for( size_t i = 0; i < sizeof(t); ++i ) |
| 380 |
> |
{ |
| 381 |
> |
h1 *= UCHAR_MAX + 2U; |
| 382 |
> |
h1 += p[i]; |
| 383 |
> |
} |
| 384 |
> |
uint32 h2 = 0; |
| 385 |
> |
p = (unsigned char *) &c; |
| 386 |
> |
for( size_t j = 0; j < sizeof(c); ++j ) |
| 387 |
> |
{ |
| 388 |
> |
h2 *= UCHAR_MAX + 2U; |
| 389 |
> |
h2 += p[j]; |
| 390 |
> |
} |
| 391 |
> |
return ( h1 + differ++ ) ^ h2; |
| 392 |
> |
} |
| 393 |
|
|
| 394 |
|
|
| 395 |
< |
inline void MTRand::save( uint32* saveArray ) const |
| 396 |
< |
{ |
| 397 |
< |
register uint32 *sa = saveArray; |
| 398 |
< |
register const uint32 *s = state; |
| 399 |
< |
register int i = N; |
| 400 |
< |
for( ; i--; *sa++ = *s++ ) {} |
| 401 |
< |
*sa = left; |
| 402 |
< |
} |
| 395 |
> |
inline void MTRand::save( uint32* saveArray ) const |
| 396 |
> |
{ |
| 397 |
> |
register uint32 *sa = saveArray; |
| 398 |
> |
register const uint32 *s = state; |
| 399 |
> |
register int i = N; |
| 400 |
> |
for( ; i--; *sa++ = *s++ ) {} |
| 401 |
> |
*sa = left; |
| 402 |
> |
} |
| 403 |
|
|
| 404 |
|
|
| 405 |
< |
inline void MTRand::load( uint32 *const loadArray ) |
| 406 |
< |
{ |
| 407 |
< |
register uint32 *s = state; |
| 408 |
< |
register uint32 *la = loadArray; |
| 409 |
< |
register int i = N; |
| 410 |
< |
for( ; i--; *s++ = *la++ ) {} |
| 411 |
< |
left = *la; |
| 412 |
< |
pNext = &state[N-left]; |
| 413 |
< |
} |
| 405 |
> |
inline void MTRand::load( uint32 *const loadArray ) |
| 406 |
> |
{ |
| 407 |
> |
register uint32 *s = state; |
| 408 |
> |
register uint32 *la = loadArray; |
| 409 |
> |
register int i = N; |
| 410 |
> |
for( ; i--; *s++ = *la++ ) {} |
| 411 |
> |
left = *la; |
| 412 |
> |
pNext = &state[N-left]; |
| 413 |
> |
} |
| 414 |
|
|
| 415 |
|
|
| 416 |
< |
inline std::ostream& operator<<( std::ostream& os, const MTRand& mtrand ) |
| 417 |
< |
{ |
| 418 |
< |
register const MTRand::uint32 *s = mtrand.state; |
| 419 |
< |
register int i = mtrand.N; |
| 420 |
< |
for( ; i--; os << *s++ << "\t" ) {} |
| 421 |
< |
return os << mtrand.left; |
| 422 |
< |
} |
| 416 |
> |
inline std::ostream& operator<<( std::ostream& os, const MTRand& mtrand ) |
| 417 |
> |
{ |
| 418 |
> |
register const MTRand::uint32 *s = mtrand.state; |
| 419 |
> |
register int i = mtrand.N; |
| 420 |
> |
for( ; i--; os << *s++ << "\t" ) {} |
| 421 |
> |
return os << mtrand.left; |
| 422 |
> |
} |
| 423 |
|
|
| 424 |
|
|
| 425 |
< |
inline std::istream& operator>>( std::istream& is, MTRand& mtrand ) |
| 426 |
< |
{ |
| 427 |
< |
register MTRand::uint32 *s = mtrand.state; |
| 428 |
< |
register int i = mtrand.N; |
| 429 |
< |
for( ; i--; is >> *s++ ) {} |
| 430 |
< |
is >> mtrand.left; |
| 431 |
< |
mtrand.pNext = &mtrand.state[mtrand.N-mtrand.left]; |
| 432 |
< |
return is; |
| 433 |
< |
} |
| 425 |
> |
inline std::istream& operator>>( std::istream& is, MTRand& mtrand ) |
| 426 |
> |
{ |
| 427 |
> |
register MTRand::uint32 *s = mtrand.state; |
| 428 |
> |
register int i = mtrand.N; |
| 429 |
> |
for( ; i--; is >> *s++ ) {} |
| 430 |
> |
is >> mtrand.left; |
| 431 |
> |
mtrand.pNext = &mtrand.state[mtrand.N-mtrand.left]; |
| 432 |
> |
return is; |
| 433 |
> |
} |
| 434 |
|
|
| 435 |
|
} |
| 436 |
|
#endif // MERSENNETWISTER_H |
