说明：  基于matlab的二阶微分动力学的智能体flocking数值模拟，其中每个智能体的动力学用微分方程来描述，给出每个个体组后的最后位置与运动方向。
(a matlab code for second-order differential multi-agent flocking simulation, each agent s dynamics is described by using differential equation. it gives the figure of all agents position and velocities.)