%MNIST源文件下載地址http://yann.lecun.com/exdb/mnist/index.html
%功能：將下載得到的二進制文件轉換為10進制數據，提取像素數據和標簽數據
%適用：僅適用于MNIST數據集，修改后可適用于其他
%Create?by?VivienFu?e-mail:vivienfu@163.com

function?output=decodefile（filenametype）
%數據介紹如下，參考網址http://yann.lecun.com/exdb/mnist/index.html

%?TRAINING?SET?LABEL?FILE?（train-labels-idx1-ubyte）:
%?
%?[offset]?[type]??????????[value]??????????[description]?
%?0000?????32?bit?integer??0x00000801（2049）?magic?number?（MSB?first）?
%?0004?????32?bit?integer??60000????????????number?of?items?
%?0008?????unsigned?byte????????????????????label?
%?0009?????unsigned?byte????????????????????label?
%?........?
%?xxxx?????unsigned?byte????????????????????label
%?The?labels?values?are?0?to?9.

%?TRAINING?SET?IMAGE?FILE?（train-images-idx3-ubyte）:
%?
%?[offset]?[type]??????????[value]??????????[description]?
%?0000?????32?bit?integer??0x00000803（2051）?magic?number?
%?0004?????32?bit?integer??60000????????????number?of?images?
%?0008?????32?bit?integer??28???

?屬性????????????大小?????日期????時間???名稱
-----------?---------??----------?-----??----

?????文件???????1275??2017-01-01?22:41??mnist_uint8.m

?????文件???????3011??2017-01-01?22:41??decodefile.m

-----------?---------??----------?-----??----

?????????????????4286????????????????????2