数字信号产生之指数分布的随机数

uniform.h

 

#pragma once

class uniform
{
private:
 double a, b, generate_num;
 int * seed;
 int s, M, N, i, j;

public:
 uniform()
 {
  M = 1048576;
  N = 2045;
 }
 void generate();
 double random_number(double, double, int *);
};

double uniform::random_number(double a, double b, int * seed)
{
 (*seed) = N * (*seed) + 1;
 (*seed) = (*seed) - ((*seed) / M) * M;
 generate_num = static_cast<double>((*seed)) / M;
 generate_num = a + (b - a) * generate_num;
 return (generate_num);
}

 

exponent.h

 

#pragma once
#include "uniform.h"
#include <math.h>

class exponent
{
private:
 double beta, u, x, generate_num;
 int s, i, j;
 int *seed;

public:
 exponent() {}
 void generate();
 double random_number(double, int *);
};

double exponent::random_number(double beta, int * seed)
{
 uniform unif_num;
 u = unif_num.random_number(0.0, 1.0, seed);
 x = -beta * log(u);
 return (x);
}

 

exponent.cpp

 

//产生50个均值为2、方差为4的指数分布的随机数
#include <iostream>
#include <iomanip>
#include "exponent.h"

using namespace std;

void main()
{
 exponent solution;
 solution.generate();
}

void exponent::generate()
{
 cout << "输入指数分布的均值：";
 cin >> beta;
 cout << "输入随机数的种子：";
 cin >> s;
 cout << "生成随机数的结果为：" << endl;
 for (i = 0; i < 10; i++)
 {
  for (j = 0; j < 5; j++)
  {
   generate_num = random_number(beta, &s);
   cout << setw(10) << generate_num;
  }
  cout << endl;
 }
}