算数编码的matlab程序，主要用于压缩txt文本，（文本里面是英文字符），主要文件为encoder.m和decoder.com，并带有概率更新，最主要的是考虑前一个符号，运用熵编码。-Arithmetic coding matlab program, mainly used to compress txt text (text which is in English characters), the main document is encoder.m and decoder.com, and updated with probability, the most important thing is to consider before a symbol, the use of entropy coding .