吉尔方法解常微分方程组的实现,gear0是具体按理，另外一个文件是解逆矩阵的代码(Implementation of gear method for solving ordinary differential equations)

吉文斯QR分解，豪斯霍尔德QR分解，三值样条插值法，共轭梯度法，4阶R-K分解(Givens QR decomposition, Moorhouse Holder QR decomposition, three value spline interpolation, conjugate gradient method, 4 order R-K decomposition)