The iterative method of finite-difference avoids the problem of solving the super-large sparseness matrix, thus occupies less random memory and calculates faster than the normal finite-element method.

• 有限差分迭代方法避免了常规的有限元法需要求解超大稀疏矩阵而导致的占用系统的内存数增加和计算速度等问题。