说明：  程序只产生均值为0，方差为1的随机数，要产生均值为E,方差为D的随机数，只要随机数*D+E就可以了。 高斯随机数程序还是带参数的，参数是用来描述正态分布的一个浮点数表。
(Procedure produced only mean 0, variance 1 random numbers, to produce a mean E, the variance for the random number D, as long as the random number* D+ E on it. Gaussian random process or the parameters, the parameter is used to describe the normal distribution of a floating-point table.)