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#include "CLHEP/Random/Randomize.h"
#include "CLHEP/Random/defs.h"
#include <iostream>
#include "CLHEP/Random/RandGaussQ.h"
#include "CLHEP/Random/RandGaussT.h"
#include "CLHEP/Random/RandPoissonQ.h"
#include "CLHEP/Random/RandPoissonT.h"
#include "CLHEP/Random/RandBit.h"
#include "CLHEP/Units/PhysicalConstants.h"
using std::cin;
using std::cout;
using std::cerr;
using std::endl;
using namespace CLHEP;
//#ifndef _WIN32
//using std::exp;
//#endif
// ---------
// RandGauss
//
// mf 12/13/04 Correction in way engines are supplied to RandBit() ctor
// (gcc3.3.1 exposed previously innocuous mistake)
// ---------
double gammln1(double xx) {
// Returns the value ln(Gamma(xx) for xx > 0. Full accuracy is obtained for
// xx > 1. For 0 < xx < 1. the reflection formula (6.1.4) can be used first.
// (Adapted from Numerical Recipes in C)
static double cof[6] = {76.18009172947146,-86.50532032941677,
24.01409824083091, -1.231739572450155,
0.1208650973866179e-2, -0.5395239384953e-5};
int j;
double x = xx - 1.0;
double tmp = x + 5.5;
tmp -= (x + 0.5) * std::log(tmp);
double ser = 1.000000000190015;
for ( j = 0; j <= 5; j++ ) {
x += 1.0;
ser += cof[j]/x;
}
return -tmp + std::log(2.5066282746310005*ser);
}
double gammln2(double xx) {
// Returns the value ln(Gamma(xx) for xx > 0. Full accuracy is obtained for
// xx > 1. For 0 < xx < 1. the reflection formula (6.1.4) can be used first.
// (Adapted from Numerical Recipes in C)
static double cof[6] = {76.18009172947146,-86.50532032941677,
24.01409824083091, -1.231739572450155,
0.1208650973866179e-2, -0.5395239384953e-5};
int j;
double x = xx - 0.0;
double tmp = x + 5.5;
tmp -= (x + 0.5) * std::log(tmp);
double ser = 1.000000000190015;
for ( j = 0; j <= 5; j++ ) {
x += 1.0;
ser += cof[j]/x;
}
return -tmp + std::log(2.5066282746310005*ser/xx);
}
#include <iomanip>
int main() {
cout << "Enter 1 for RandGauss, 2 for RandGaussQ, 3 for DualRand flat: ";
int choice;
cin >> choice;
if (choice==1) {
cout << "\n--------------------------------------------\n";
cout << "Test of Gauss distribution speed\n\n";
long seed;
cout << "Please enter an integer seed: ";
cin >> seed;
int nNumbers;
cout << "How many numbers should we generate: ";
cin >> nNumbers;
cout << "\nInstantiating distribution utilizing DualRand engine...\n";
DualRand eng (seed);
RandGauss dist (eng);
double sum = 0;
for (int i=0; i < nNumbers; i++) {
sum += dist.fire();
}
cout << "\n Finished: sum is " << sum << " \n";
}
if (choice==2) {
cout << "\n--------------------------------------------\n";
cout << "Test of RandGaussQ distribution speed\n\n";
long seed;
cout << "Please enter an integer seed: ";
cin >> seed;
int nNumbers;
cout << "How many numbers should we generate: ";
cin >> nNumbers;
cout << "\nInstantiating distribution utilizing DualRand engine...\n";
DualRand eng (seed);
RandGaussQ dist (eng);
double sum = 0;
for (int i=0; i < nNumbers; i++) {
sum += dist.fire();
}
cout << "\n Finished: sum is " << sum << " \n";
}
if (choice==3) {
cout << "\n--------------------------------------------\n";
cout << "Test of DualRand flat speed\n\n";
long seed;
cout << "Please enter an integer seed: ";
cin >> seed;
int nNumbers;
cout << "How many numbers should we generate: ";
cin >> nNumbers;
cout << "\nInstantiating distribution utilizing DualRand engine...\n";
DualRand eng (seed);
double sum = 0;
for (int i=0; i < nNumbers; i++) {
sum += eng.flat();
}
cout << "\n Finished: sum is " << sum << " \n";
}
#ifdef GAMMA
cout << "\nNow we will compute the first 20 gammas, using gammln:\n";
double x;
for (x=1; x <= 20; x+=1) {
cout << x << std::setprecision(20) << " " << std::exp(gammln1(x))
<< " " << std::exp(gammln2(x)) << " difference in gammln2 = " <<
gammln1(x)-gammln2(x) << "\n";
}
cout << "\nNow we will compute gamma of small numbers: \n";
for ( x=1; x > .000000001; x *= .9 ) {
cout << x << std::setprecision(20) << " " <<
1 - std::exp(gammln1(x)) * std::exp(gammln1(2-x)) * std::sin(CLHEP::pi*(1-x)) / (CLHEP::pi*(1-x)) <<
" " <<
1 - std::exp(gammln2(x)) * std::exp(gammln1(2-x)) * std::sin(CLHEP::pi*(1-x)) / (CLHEP::pi*(1-x)) <<
"\n";
}
#endif // GAMMA
#ifdef POISSON
cout << "\n--------------------------------------------\n";
cout << "Test of Poisson distribution speed\n\n";
long seed;
cout << "Please enter an integer seed: ";
cin >> seed;
double mu;
cout << "Please enter mu: ";
cin >> mu;
int nNumbers;
cout << "How many numbers should we generate: ";
cin >> nNumbers;
cout << "\nInstantiating distribution utilizing DualRand engine...\n";
DualRand eng (seed);
RandPoisson dist (eng, mu);
// RandFlat dist (eng);
double sum = 0;
for (int i=0; i < nNumbers; i++) {
sum += dist.fire();
// sum += dist.quick();
// sum += dist.fire(mu);
// sum += dist.quick(mu);
}
cout << "\n Finished: sum is " << sum << " \n";
#endif // POISSON
#define MISC
#ifdef MISC
DualRand e;
// RandGauss usage modes
cout << "testing RandGaussT::shoot(): " << RandGaussT::shoot() << "\n";
cout << "testing RandGaussT::shoot(&e): " << RandGaussT::shoot(&e) << "\n";
cout << "testing RandGaussT::shoot(100,10): " <<
RandGaussT::shoot(100,10) << "\n";
cout << "testing RandGaussT::shoot(&e,100,10): " <<
RandGaussT::shoot(&e,100,10) << "\n";
RandGaussT gt (e, 50,2);
cout << "testing gt.fire(): " << gt.fire() << "\n";
cout << "testing gt.fire(200,2): " << gt.fire(200,2) << "\n";
cout << "testing RandGaussQ::shoot(): " << RandGaussQ::shoot() << "\n";
cout << "testing RandGaussQ::shoot(&e): " << RandGaussQ::shoot(&e) << "\n";
cout << "testing RandGaussQ::shoot(100,10): " <<
RandGaussQ::shoot(100,10) << "\n";
cout << "testing RandGaussQ::shoot(&e,100,10): " <<
RandGaussQ::shoot(&e,100,10) << "\n";
RandGaussQ qt (e, 50,2);
cout << "testing qt.fire(): " << qt.fire() << "\n";
cout << "testing qt.fire(200,2): " << qt.fire(200,2) << "\n";
// RandPoisson usage modes
cout << "testing RandPoissonT::shoot(): " << RandPoissonT::shoot() << "\n";
cout << "testing RandPoissonT::shoot(&e): "
<< RandPoissonT::shoot(&e) << "\n";
cout << "testing RandPoissonT::shoot(90): " <<
RandPoissonT::shoot(90) << "\n";
cout << "testing RandPoissonT::shoot(&e,90): " <<
RandPoissonT::shoot(&e,90) << "\n";
RandPoissonT pgt (e,50);
cout << "testing pgt.fire(): " << pgt.fire() << "\n";
cout << "testing pgt.fire(20): " << pgt.fire(20) << "\n";
cout << "testing RandPoissonQ::shoot(): " << RandPoissonQ::shoot() << "\n";
cout << "testing RandPoissonQ::shoot(&e): " << RandPoissonQ::shoot(&e) << "\n";
cout << "testing RandPoissonQ::shoot(90): " <<
RandPoissonQ::shoot(90) << "\n";
cout << "testing RandPoissonQ::shoot(&e,90): " <<
RandPoissonQ::shoot(&e,90) << "\n";
RandPoissonQ pqt (e,50);
cout << "testing pqt.fire(): " << pqt.fire() << "\n";
cout << "testing pqt.fire(20): " << pqt.fire(20) << "\n";
// RandBit modes coming from RandFlat and bit modes
cout << "testing RandBit::shoot(): " << RandBit::shoot() << "\n";
cout << "testing RandBit::shoot(&e): " << RandBit::shoot(&e) << "\n";
cout << "testing RandBit::shoot(10,20): " << RandBit::shoot(10,20) << "\n";
cout << "testing RandBit::shoot(&e,10,20): "<<
RandBit::shoot(&e,10,20) << "\n";
RandBit b ( e, 1000, 1100 );
cout << "testing b.fire(): " << b.fire() << "\n";
cout << "testing b.fire(10,20): " << b.fire(10,20) << "\n";
int i;
cout << "testing RandBit::shootBit(): ";
for (i=0; i<40; i++) {
cout << RandBit::shootBit();
} cout << "\n";
cout << "testing RandBit::shootBit(&e): ";
for (i=0; i<40; i++) {
cout << RandBit::shootBit(&e);
} cout << "\n";
cout << "testing RandBit::fireBit(): ";
for (i=0; i<40; i++) {
cout << b.fireBit();
} cout << "\n";
// Timing for RandBit:
cout << "Timing RandFlat::shootBit(): Enter N: ";
int N;
cin >> N;
int sum=0;
for (i=0; i<N; i++) {
sum+= RandFlat::shootBit();
}
cout << "--------- Done.............. Sum = " << sum << "\n";
cout << "Timing RandBit::shootBit(): Enter N: ";
cin >> N;
sum = 0;
for (i=0; i<N; i++) {
sum += RandBit::shootBit();
}
cout << "--------- Done.............. Sum = " << sum << "\n";
#endif // MISC
return 0;
}
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