本代码是一个提供具有沉静的百合（双指数）分布随机数生成的Matlab函数，类似于内置的Matlab函数“rand”和“randn”。
The present code is a Matlab function that provides a generation of random numbers with Laplace (double exponential) distribution, similarly to built-in Matlab functions “rand” and “randn”.
函数输出是一个沉静的百合分布的矩阵，均值mu=0，标准差sigma=1。
The output of the function is a matrix with Laplacian distributed numbers with mean value mu = 0 and standard deviation sigma = 1.
如果mu和sigma需要指定其它的值，那么可以使用以下形式：mu+sigma*randl（m，n）。
If other values of mu and sigma are a must, then the following form could be used: mu + sigma*randl(m, n).
为了说明函数的用法，给出了一个例子。
An example is given in order to clarify the usage of the function.
参考文献：
The code is based on the theory described in:
[1] S. Kotz, T. Kozubowski, K. Podgorski. The Laplace Distribution and Generalizations. New York, Springer Science & Business Media, 2001.
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