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简介:AmutuallyorthogonalsystemofrationalSomeapproximationresultsareestablishedfunctionsonthewholelineisintroduced.Asanexampleofapplications,amodifiedLegendrerationalspectralschemeisgivenfortheDiracequation.Itsnumericalsolutionkeepsthesameconservationasthegenuinesolution.Thisfeaturenotonlyleadstoreasonablenumericalsimulationofnonlinearwaves,butalsosimplifiestheanalysis.Theconvergenceoftheproposedschemeisproved.Numericalresultsdemonstratetheefficiencyofthisnewapproachandcoincidewiththeanalysiswell.
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简介:
简介:Basedontheworkofpaper,weproposeamodifiedLevenberg-MarquardtalgoithmforsolvingsingularsystemofnonlinearequationsF(x)=0,whereF(x):R^n→R^niscontinuouslydifferentiableandF'(x)isLipschitzcontinuous.Thealgorithmisequivalenttoatrustregionalgorithminsomesense,andtheglobalconvergenceresultisgiven.Thesequencegeneratedbythealgorithmconvergestothesolutionquadratically,if||F(x)||2providesalocalerrorboundforthesystemofnonlinearequations.Numericalresultsshowthatthealgorithmperformswell.
简介:牛顿的重复为单个Toeplitz矩阵的组逆的计算被修改。在每次重复,重复矩阵被一个矩阵与一个低排水量等级接近。因为重复矩阵的排水量结构,涉及牛顿的重复的thematrix向量增加能高效地被做。我们证明修改牛顿重复的集中仍然是很快的。数字结果被介绍表明建议方法的快集中。
简介:1.IntroductionAssumethatwearefindingtheminimizerofthefollowingunconstrainedoptimizationproblemminf(x),(1.1)acReandassumethecurrentpointisxk’TOcalculatexk+1fromxkbyalinesearchmethod,thefollowingiterationXk+1~Xk+Akpk,k~1,2,’’’(1.2)isapplied.IntheBFGSal...
简介:切开的修改Hermitian和skew-Hermitian(MHSS)重复方法被黄雾,Benzi和陈介绍并且学习(计算,87(2010),93-111)为解决复杂对称的线性系统的一个类。在这份报纸,用Toeplitz矩阵的性质,我们为解决复杂Toeplitz建议结构化的MHSS重复方法的一个班线性系统。理论分析证明结构化的MHSS重复方法对准确答案无条件地会聚。当MHSS重复方法直接被使用到复杂对称的Toeplitz线性系统时,计算费用能被Toeplitz结构的使用体谅地减少。最后,数字实验证明结构化的MHSS重复方法和结构化的MHSSpreconditioner为解决复杂Toeplitz是有效的线性系统。[从作者抽象]