中文说明：这是写在 matlab 和主要处理力学问题的矩形的主体力量，然后用有限元法求解应力、 应变和位移的每个节点的代码。
English Description：
This is code written in matlab, and mainly deal with the mechanics problem of rectangular subjects to forces, then using the FEM method to solve the stress, strain and displacement of each nodes.