本程序为《结构分析的有限元法与Matlab程序设计》第三章的第一个算例，采用平面梁单元计算平面刚架的变形和内力，已经过修改。-This program is "structural analysis of the finite element method and Matlab Programming"　chapter of the first example, the use of plane beam element of plane frame deformation and internal forces, which have been modified.