允许通过灵活定义子图边界充分利用图形中的有限区域。
Allows fully utilizing the figure surface by defining margins, by wrapping the existing subplot function.
不幸的是，MATLAB自带的subplot程序并不允许用户以方便灵活的方式对每个子图形进行配置。
Unfortunately the original subplots function spends lavishly the figure area , without allowing the user to control it in a convenient manner.
本函数除了具备subplot功能（完全支持）外，用户还可以定义边界距离，从而可以使得图中显示的坐标轴更大。
In addition to subplot functionality (fully supported) the user can define margins, which result in larger axis presented in the figure.
默认边界距离为图形区域的1%。
Default margins are 1% of figure area.
完整源码下载地址：
http://page2.dfpan.com/fs/elc3j272182961628c4/
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