在不同的预条件矩阵下提出新的U880R迭代法,讨论了新方法的收敛性,并得到比较定理,从而更好地说明选择适当的预条件矩阵能加快收敛速度.用数值例子验证了所得结论的正确性.
Under some preconditioned matrices, the new USSOR iterative methods are obtained. The convergence of the new methods is discussed and the comparison theorems are also obtained. It is shown that the proper preconditioned matrices can accelerate the process of convergence. A numerical example is given to illustrate the theorems.