摘要
当最小二乘形式矩阵Pade-型逼近(LSMPTA)中Hankel矩阵呈病态时,其逼近解往往很不稳定.通过引入适当的权因子矩阵,将LSMPTA转化为与之等价且稳定性较高的一种新的LSMPTA,即加权的最小二乘形式矩阵Pade-型逼近,并给出了最佳权因子的选择标准.最后,通过数值实例说明了该方法的有效性.
The least-squares matrix Pade-type approximation(LSMPTA) can be quite unstable for the ill-conditioned Hankel matrix of LSMPTA.By introducing some appropriate weight matrices,the LSMPTA is transformed into a new equivalent and more stable variant,that is,the weighted least-squares matrix Pade-type approximation in this paper.The selection standard of the weighted factor is given.In the end,a numerical example shows effectiveness of the method.
出处
《应用数学与计算数学学报》
2016年第2期245-252,共8页
Communication on Applied Mathematics and Computation
基金
国家自然科学基金资助项目(11371243)
上海市教委科研创新基金重点资助项目(13ZZ068)