一个很好的开源项目管理系统源代码，大家可以部署测试，看看效果如何。,A very good open-source project management system source code, we can deploy the test to see how.

本代码能实现拉格朗日函数拟合，经验证具有很好的插值拟合效果。-This code can achieve the Lagrangian function fitting, interpolation proven with good fitting effect.