正态分布随机数的产生

#include <stdio.h> #include <stdlib.h> #include <time.h> #include <math.h> const double PI = atan2(1.0 , 1.0) * 4; /********************************************** ** 姓 名: 程炀 ** 功 能：高斯分布 ** 学 校: 西北工业大学 ** 时 间: 2017.09.23 **********************************************/ //方法一:统计近视抽样法 double Gauss_Rand1(double mu,double sigma) { double z,r,sum; sum = 0.0; for(int i = 1;i <= 12;i++) { r = (double)rand() / RAND_MAX; sum = sum + r; } z = (sum - 6.00) * sigma + mu; return z; } //方法一:变换抽样法 double Gauss_Rand2(double mu,double sigma) { double r1,r2; double z; r1 = (double)rand() / RAND_MAX; r2 = (double)rand() / RAND_MAX; z = sqrt( -2 * log( r1 ) ) * cos( 2.0 * PI * r2) * sigma + mu; return z; } int main() { double mu,sigma; //均值，标准差 double num; //产生数目 int numCount; //计数器，控制输出格式 mu = 0; sigma = 1; num = 100; numCount = 0; srand( (unsigned)time( NULL ) ); for (int i = 0; i < num; i++) { printf("%lf\t",Gauss_Rand1(mu,sigma)); if (++numCount % 5 == 0) { printf("\n"); } } printf("**************************************************************************\n"); numCount = 0; for (int i = 0; i < num; i++) { printf("%lf\t",Gauss_Rand2(mu,sigma)); if (++numCount % 5 == 0) { printf("\n"); } } getchar(); return 0; }