说明： 该函数用来计算任意函数的一阶偏导数(数值方法),雅克比迭代求解线性方程组课设,复化三点Gauss-lengend公式求pi。 ( This function is used to calculate the arbitrary function of the first order partial derivative (numerical methods), Jacobi iteration for solving linear equations class-based, Complex of three-point Gauss-lengend the Formula pi.)
