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// -*- C++ -*-
/**
* @brief The test file of class RandomGenerator for standard methods
*
* Copyright 2005-2025 Airbus-EDF-IMACS-ONERA-Phimeca
*
* This library is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this library. If not, see <http://www.gnu.org/licenses/>.
*
*/
#include "openturns/OT.hxx"
#include "openturns/OTtestcode.hxx"
using namespace OT;
using namespace OT::Test;
int main(int, char *[])
{
TESTPREAMBLE;
OStream fullprint(std::cout);
try
{
// Test the initialization method
RandomGenerator::SetSeed(0);
// Test the state accessor for reading
RandomGeneratorState initialState(RandomGenerator::GetState());
fullprint << "state index=" << initialState.getIndex() << " state array=" << initialState.getBuffer() << std::endl;
// Test the generation of one realization
Scalar realization = RandomGenerator::Generate();
fullprint << "one realization=" << realization << std::endl;
RandomGeneratorState state(RandomGenerator::GetState());
fullprint << "new state index=" << state.getIndex() << std::endl;
// Test the generation of several realizations
UnsignedInteger size = 10000;
Point several(RandomGenerator::Generate(size));
fullprint << size << " realizations, first=" << several[0] << ", last=" << several[size - 1] << std::endl;
// Test the state accessor for writing
RandomGenerator::SetState(initialState);
fullprint << "restoring initial state, one realization=" << RandomGenerator::Generate() << std::endl;
// Test the uniformity of the random generator
size = 100000;
Point manyPoints(RandomGenerator::Generate(size));
UnsignedInteger slice = 10;
Point frequencies(slice, 0.0);
Scalar mean = 0.0;
for (UnsignedInteger i = 0; i < size; i++)
{
frequencies[(UnsignedInteger)(slice * manyPoints[i])]++;
mean += manyPoints[i];
}
mean /= size;
fullprint << "mean of " << size << " realizations=" << mean << std::endl;
for (UnsignedInteger i = 0; i < slice; i++)
{
frequencies[i] /= size;
fullprint << "frequency in slice [" << Scalar(i) / slice << ", " << Scalar(i + 1) / slice << "]=" << frequencies[i] << std::endl;
}
fullprint << "One integer generation in [[0, " << slice - 1 << "]]=" << RandomGenerator::IntegerGenerate(slice) << std::endl;
fullprint << "Another integer generation in [[0, " << slice - 1 << "]]=" << RandomGenerator::IntegerGenerate(slice) << std::endl;
Collection<UnsignedInteger> manyUnsignedInteger(RandomGenerator::IntegerGenerate(size, slice));
frequencies = Point(slice, 0.0);
mean = 0.0;
for (UnsignedInteger i = 0; i < size; i++)
{
frequencies[manyUnsignedInteger[i]]++;
mean += manyUnsignedInteger[i];
}
mean /= size;
fullprint << "mean of " << size << " integer realizations=" << mean << std::endl;
for (UnsignedInteger i = 0; i < slice; i++)
{
frequencies[i] /= size;
fullprint << "frequency for value " << i << "=" << frequencies[i] << std::endl;
}
}
catch (TestFailed & ex)
{
std::cerr << ex << std::endl;
return ExitCode::Error;
}
return ExitCode::Success;
}
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