128 bit pseudo random function generator

[newbie1234]

I want to use 128 Bit pseudo random function generator in my acadmic project. But i did not found. Can any one please tell where i can get it in c++ or c language.

Thanks in advance

[L7Sqr]

You want a function generator or a function that will generate a 128bit random number?

You may be out of luck for a function generator. As for the random number, this has a lot of relevant information.

[mike_2000_17]

If you use the Boost.Random library, there are plenty of different random number generators with all sorts of cycle lengths (including 2300000 bits).

The new C++ standard (C++11) also includes a random library with a lot of the generators from the Boost.Random library, but you need a fairly recent compiler to have that available. You can also use the underlying random number engines to create custom generators, the methods available are linear-congruential, mersenne-twister, subtract-with-carry, discard-block, independent-bits, and shuffle-order engines. There are plenty of options.

[newbie1234]

If you use the Boost.Random library, there are plenty of different random number generators with all sorts of cycle lengths (including 2300000 bits).

The new C++ standard (C++11) also includes a random library with a lot of the generators from the Boost.Random library, but you need a fairly recent compiler to have that available. You can also use the underlying random number engines to create custom generators, the methods available are linear-congruential, mersenne-twister, subtract-with-carry, discard-block, independent-bits, and shuffle-order engines. There are plenty of options.

Thank you for your valuable comment or suggestion.
I found /usr/include/boost/random/linear_congruential.hpp library. Can you please one example using rand48 class in this library.

[mike_2000_17]

Yeah sure, here's an example:

#include <boost/random/linear_congruential.hpp>

#include <boost/random/uniform_01.hpp>
#include <boost/random/normal_distribution.hpp>

#include <iostream>
#include <ctime>

int main() {
  boost::random::rand48 rng = boost::random::rand48((unsigned int)time(NULL));

  std::cout << " This is a random number: " << rng() << std::endl;

  boost::random::uniform_01<double> udist;

  std::cout << " This is a uniformly distributed 'double' value in range [0,1]: " << udist(rng) << std::endl;

  boost::random::normal_distribution<double> ndist(0.5, 0.25);

  std::cout << " This is a normally distributed 'double' value with mean 0.5 and std-dev 0.25: " << ndist(rng) << std::endl;

  return 0; 
};

[newbie1234]

Yeah sure, here's an example:

#include <boost/random/linear_congruential.hpp>

#include <boost/random/uniform_01.hpp>
#include <boost/random/normal_distribution.hpp>

#include <iostream>
#include <ctime>

int main() {
  boost::random::rand48 rng = boost::random::rand48((unsigned int)time(NULL));

  std::cout << " This is a random number: " << rng() << std::endl;

  boost::random::uniform_01<double> udist;

  std::cout << " This is a uniformly distributed 'double' value in range [0,1]: " << udist(rng) << std::endl;

  boost::random::normal_distribution<double> ndist(0.5, 0.25);

  std::cout << " This is a normally distributed 'double' value with mean 0.5 and std-dev 0.25: " << ndist(rng) << std::endl;

  return 0; 
};

Thankyou mike

but when i am running this it gives

../random_gen.cpp: In function ‘int main()’:
../random_gen.cpp:19: error: ‘rand48’ is not a member of ‘boost::random’
../random_gen.cpp:19: error: expected ‘;’ before ‘rng’
../random_gen.cpp:20: error: ‘rng’ was not declared in this scope
../random_gen.cpp:21: error: ‘uniform_01’ is not a member of ‘boost::random’
../random_gen.cpp:21: error: expected primary-expression before ‘double’
../random_gen.cpp:21: error: expected ‘;’ before ‘double’
../random_gen.cpp:22: error: ‘udist’ was not declared in this scope
../random_gen.cpp:23: error: ‘normal_distribution’ is not a member of ‘boost::random’
../random_gen.cpp:23: error: expected primary-expression before ‘double’
../random_gen.cpp:23: error: expected ‘;’ before ‘double’
../random_gen.cpp:24: error: ‘ndist’ was not declared in this scope
make: *** [random_gen.o] Error 1

[newbie1234]

Thankyou mike

but when i am running this it gives

../random_gen.cpp: In function ‘int main()’:
../random_gen.cpp:19: error: ‘rand48’ is not a member of ‘boost::random’
../random_gen.cpp:19: error: expected ‘;’ before ‘rng’
../random_gen.cpp:20: error: ‘rng’ was not declared in this scope
../random_gen.cpp:21: error: ‘uniform_01’ is not a member of ‘boost::random’
../random_gen.cpp:21: error: expected primary-expression before ‘double’
../random_gen.cpp:21: error: expected ‘;’ before ‘double’
../random_gen.cpp:22: error: ‘udist’ was not declared in this scope
../random_gen.cpp:23: error: ‘normal_distribution’ is not a member of ‘boost::random’
../random_gen.cpp:23: error: expected primary-expression before ‘double’
../random_gen.cpp:23: error: expected ‘;’ before ‘double’
../random_gen.cpp:24: error: ‘ndist’ was not declared in this scope
make: *** [random_gen.o] Error 1

I correct this. Thanks once again
code is

#include <boost/random/linear_congruential.hpp>

#include <boost/random/uniform_01.hpp>
#include <boost/random/normal_distribution.hpp>

#include <iostream>
#include <ctime>
using namespace std;
using namespace boost;

int main() {
            rand48 rng = rand48((unsigned int)time(NULL));

  std::cout << " This is a random number: " << rng() << std::endl;


  uniform_01<double> udist;

  std::cout << " This is a uniformly distributed 'double' value in range [0,1]: " << udist(rng) << std::endl;

  normal_distribution<double> ndist(0.5, 0.25);

 std::cout << " This is a normally distributed 'double' value with mean 0.5 and std-dev 0.25: " << ndist(rng) << std::endl;

  return 0;
};