中文说明：
在处理数据的时候我们经常要算各个区间的频数，但是在matlab中没有这样的命令。当数据比较大的时候自己数就比较麻烦，这里编了个小程序。
English Description：
When processing data, we often have to calculate the frequency of each interval, but there is no such command in MATLAB. When the data is large, it is more troublesome to count yourself. Here is a small program