用于计算张雄《计算动力学》4-1、4-5中的wilson法例子。书中原来使用fortran太麻烦了，改为matlab了，两个自由度体系。-Zhang Xiong used to calculate the Computational Dynamics in the example wilson 4-1,4-5 law. The original book using fortran too much trouble, instead matlab, the two degrees of fr