matlab精通书上源代码，很多实用的m文件都包含。另有有限元分析动力学书上源代码，基本上所有的结构类型的刚度与质量矩阵都有。-matlab proficient on the source code, a lot of useful m files are included. Another finite element analysis on the dynamics of the source code, basically all the stiffness and mass matri