一维自适应有限元算法，根据理论推导的后验误差估计，更新步长，不断的迭代，特别适用于有边界成或者间断解的情形，适合数值计算的初接触者-One-dimensional adaptive finite element algorithm, based on theoretical derivation of a posteriori error estimation update step, continuous iteration, especially for border into or situation Discontinuous Solutions, the early numerical calculation contacts