用高斯-赛德尔迭代法求方程组的根。它的原理与简单迭代法相似，但在赛德尔迭代法中，每次迭代时充分利用当前最新的迭代值-With the Gauss- Seidel iterative method seeking the roots of equations. Its principle with simple iterative method similar, but the Seidel iteration method in each iteration to take full advan