二维热传导函数，可以根据此程序绘制热传导过程中温度场分布情况-The two-dimensional thermal conduction function, the distribution of the temperature field in the process of heat conduction can be drawn based on this program

解决二维热传导问题的函数。使用者可随意设置初始条件和边界条件。(A function to solve the problem of two-dimensional heat conduction.Users can set initial conditions and boundary conditions at will.)