数字信号处理C语言（1） ------均匀分布和高斯分布随机数

环境：QT5+VS2013编译

一、均匀分布

double uniform(double a,double b,long int *seed)
a下限，b上限，seed随机种子。

main.cpp

#include <QCoreApplication>
#include <math.h>
#include <stdio.h>
#include <stdlib.h>
#include <uniform.c>



int main(int argc, char *argv[])
{
    QCoreApplication a(argc, argv);
    double b,c,x;int i,j;
    long int s;
    double uniform(double,double,long int *);
    b=0.0;c=1.0;s=13579;
    for(i=0;i<10;i++)
    {
        for(j=0;j<5;j++)
        {
            x=uniform(b,c,&s);
            printf("%13.7f",x);
        }
        printf("
");
    }

    return a.exec();
}

uniform.c

double uniform(double a,double b,long int *seed)
{

double t;
*seed=2045*(*seed)+1;
*seed=*seed-(*seed/1048576)*1048576;
t=(*seed)/1048576.0;
t=a+(b-a)*t;
return(t);
}

二、高斯分布

double gauss(double mean,double sigma,long int *s)
mean位置参数，sigma尺度参数，seed随机种子

main.cpp

#include <QCoreApplication>
#include <math.h>
#include <stdio.h>
#include <stdlib.h>
#include <gauss.c>



int main(int argc, char *argv[])
{
    QCoreApplication a(argc, argv);
   

    int i,j;
     long int s;
     double x,mean,sigma;
     double gauss(double,double,long int *);
     mean=0.0;sigma=1.0;s=13579;
     for(i=0;i<10;i++)
     {
         for(j=0;j<5;j++)
         {
             x=gauss(mean,sigma,&s);
             printf("%13.7f",x);
         }
         printf("
");
     }

    return a.exec();
}

gauss.c

#include <uniform.c>

double gauss(double mean,double sigma,long int *s)
{

    int i;
    double x,y;
    double uniform(double,double,long int *);
    for(x=0,i=0;i<12;i++)
        x+=uniform(0.0,1.0,s);
    x=x-6.0;
    y=mean+x*sigma;
    return(y);
}

uniform.c

double uniform(double a,double b,long int *seed)
{

double t;
*seed=2045*(*seed)+1;
*seed=*seed-(*seed/1048576)*1048576;
t=(*seed)/1048576.0;
t=a+(b-a)*t;
return(t);
}