病态系统的蛙跳算法，计算量小。首先将非齐次方程的输入量u(t)增广为状态变量，化为齐次方程组。输入量通常为典型输入。-The morbid system leapfrog algorithm to calculate the amount. First, enter the amount of the non-homogeneous equation u (t) is augmented as state variables, Homogeneous equations. The input a