常用数值算法的C++源码，包括三次样条插值、二重积分计算、常微分初值问题数值解、Newton迭代法、列主元高斯消去法、逐次超松弛迭代法。-Numerical algorithm used in C++ source code, including the cubic spline interpolation, double integral, the ordinary differential initial value problem numerical solution, Newton it