生成高斯分布的随机数用C - 如何将一个保0和1之间的值

问题描述

我一直工作在一个函数生成rel=\"nofollow\">这种零和1

I've been working on a function to generate gaussian distributed random randoms between zero and 1. This website here was a great help as I basically copied the algorithm for Polar Form to get an understanding of the procedure, but I am having trouble keeping the value between 0 and 1, including 0 but excluding 1. I believe the mathematical notation for this is [0, 1) if I'm correct. Any insight you could provide would be great. On Unix, this compiles with; gcc fileName.c -lm

#include <limits.h>
#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#include <math.h>

int main()
{
    int i;
    float x, w;
    for (i=0; i<50; i++)
    {
        do {
            x = 2.0 * ( (float)rand() / (float)RAND_MAX ) - 1.0;
            w = x * x;
        }while (w >= 1.0);

        w = (float)sqrt( (-2.0 * log( w )) / w );
        printf("%f\n", x*w);
    }
    return 0;
}

解决方案

I believe the questioner is asking for something like a truncated gaussian distribution. You can sample such a distribution simply by generating samples from a Gaussian distribution with mean 0.5 and suitable variance, and discarding any samples that lie outside of [0,1].

However, you might also be interested in:

• A logitnormal distribution
• A uniform sum distribution
• A raised-cosine distribution

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