中文说明：有CDF三角函数曲线/三维曲线图，均值便宜跟踪的示例，鲁棒性好，性能优越，毕业设计有用，真的是一个好程序，数值分析的EULER法。
English Description：
There are CDF trigonometric function curves / three-dimensional curves, the average cost of tracking examples, good robustness, excellent performance, the graduation design is useful, is really a good program, numerical analysis of the EULER method.