本程序为无对角矩阵代数方程的通用解法，可以方便的用于二维导热对流传热的数值求解。-This program is no universal solution to the diagonal matrix algebraic equations can be easily used for two-dimensional thermal convection in the numerical solution.

本程序为常微分方程组的通用数值解法。定步长4阶龙格库塔法求解常微分方程组。-This program is universal numerical solution of ordinary differential equations. 4-order fixed step length Runge Kutta method of ordinary differential equations.