这是一个可以运行的追赶法程序，当线性代数联立方程组的系数矩阵为三对角矩阵时，可采用追赶法程序，效果非常有效。-This is a program that can be run to catch up with law, when the coefficient of linear algebraic simultaneous equations matrix is tridiagonal matrix, the method can be used to catch up with the p