说明：  2维桁架有限元分析程序,本程序为国外《Indroduction to Finite Element in Engineering》书中附带的程序源码，经过实际考证可以应用。希望对大伙有用
(2-D truss finite element analysis program, the procedures for foreign " Indroduction to Finite Element in Engineering" program source code included with the book, after the actual research can be applied. Want to be useful for everyone)