绘制庞加莱截面图,在相空间中适当（要有利于观察系统的运动特征和变化，如截面不能与轨线相切，更不能包含轨线）选取一截面，在此截面上某一对共轭变量如x1和x.1取固定值，称此截面为Poincare截面，相空间的连续轨迹与Poincare截面的交点成为截点。-mapping Poincare section, in phase space appropriate (observation system should be beneficial to the movement and change, i

水平竖直线交点就是输入些水平线段和竖直线段的坐标（文件输入） 然后输出几个交点-The level of vertical lines is the intersection of some level of input the coordinates of line segments and vertical segments (file type) and then the output of several intersection

X1,X2,X3,X4分别为4个点的三维坐标，例如X1=[1,2,3]，本程序可以计算出直线X1X2与X3X4的交点P的坐标X，如果直线X1X2与X3X4不相交，则给出的是直线X1X2与X3X4的公垂线在直线X1X2上的垂足的坐标。-X1, X2, X3, X4 are 4 three-dimensional coordinates of points, such as X1 = [1,2,3], the program can calculate the intersection of lin

利用蒙特卡洛方法计算圆周率pi，模拟针与平行线相交的概率，通过概率值计算pi。(To compute PI by using the Monte Carlo method, probability simulation of needle and the intersection of parallel lines, the PI is calculated by the probability value.)