一种基于VB环境下组合随机数发生器的构建

由于随机数是离散事件系统计算机仿真的核心所在，所以随机数列的性能好坏直接影响仿真结果的有效性。该文叙述了采用构造的线性同余发生器和Visual Basic环境中Rnd()函数结合起来，构建组合发生器的方法。比较了单独使用RIM()函数得到的随机数列与使用组合发生器得到的随机数列的性能指标，后者在保持随机数列均匀性的同时，大大提高了随机数列的独立性。

Research on a Kind of Combined Pseudorandom Number Generator Based on Visual Basic

As we know, the random number is the base of computer simulation for discrete event dynamic system(DEDS). So the capability of the random number sequence will affect the effectiveness of our simulation result. In this paper, we build a combined generator by combining a linear congruence generator and the Rnd() function in Visual Basic.Then we use either the Rnd() function or the combined generator to create a series of random number sequences. We find the statistical characters of the latter are far better. Along with retaining the homogeneity, it improves the independence greatly.