code for solving 2D FEM heat problem with quadrilateral s meshing

Solving several BVP s (1D example, 2D wave equation, 2D heat equation, 3D cantilever beam deflection (linear & quadratic elements) with use of very basic FEM techniques.

计算二维传热问题的有限元程序包，非常难得，对传热感兴趣的人会有帮助。(Finite element matlab code for 2D heat transfer calculation. It deserve to obtain. It will be helpful for the man interested in heat transfer.)