CwMtx has no built-in random number generator, and there is no class function that fills a matrix with random elements.
CwMtx没有内置的随机数生成器，也没有用随机元素填充矩阵的类函数。
2
Before the Rnd function can be called, a call to the Randomize procedure must be made to initialize the random number generator.
调用Rnd前，必须先调用Randomize过程以初始化随机数字生成器。
3
According to the signal can be divided into sine wave signal, function (wave) signals, pulse signals and random signal generator, and other four major categories.