学科分类
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9 个结果
  • 简介:ForasimpleundirectedgraphG,denotebyA(G)the(0,1)-adjacencymatrixofG.LetthematrixS(G)=J-I-2A(G)beitsSeidelmatrix,andletSG(λ)=det(λI-S(G))beitsSeidelcharacteristicpolynomial,whereIisanidentitymatrixandJisasquarematrixallofwhoseentriesareequalto1.IfalleigenvaluesofSG(λ)areintegral,thenthegraphGiscalledS-integral.Inthispaper,ourmaingoalistoinvestigatetheeigenvaluesofSG(λ)forthecompletemultipartitegraphsG=Kn1,n2,...,nt.AnecessaryandsufficientconditionforthecompletetripartitegraphsKm,n,tandthecompletemultipartitegraphsKm,...,ms,n,...,nttobeS-integralisgiven,respectively.

  • 标签: 完全多部图 积分 邻接矩阵 特征多项式 单位矩阵 充分条件
  • 简介:LetthelinearsystemAx=bwherethecoefficientmatrixA=(aij)∈Rm,nisanL-ma-trix(thatis,aij>0(?)iandaij≤0(?)i≠j),A=I-L-U,Iistheidentitymatrix,-Land-Uare,respectively,strictlylowerandstrictlyuppertriangularpartsofA.In[1]theauthorsconsideredtwopreconditionedlinearsystems?x=(?)and?x=(?)

  • 标签:
  • 简介:AnasynchronousparallelmultisplittingnonlinearGauss-SeideliterativemethodisestablishedfortheparticularlystructuredsystemofnonlinearequationsAφ(x)+Bφ(x)=bwithA,B∈(R^n)φ,φtR^n→R^nbeingdiagonalmappingsandb∈R^n,andtheglobalconvergenceofitisproved.

  • 标签: GAUSS-SEIDEL迭代法 异步平行 非线性方程 构建系统
  • 简介:在计算线性方程组时,我们有时会遇到其系数矩阵A是严格次对角占优及次正定的次对称的情形,对于这样的方程组,我们不能直接应用Jacobi、Gauss—Seidel及超松驰迭代法进行求解.在文[2]中,利用了JA是严格对角占优(占A是严格次对角占优)及JA是正定对称(当A是次正定的次对称)的性质,对方程AX=b作用J得方程JAX=Jb,对此方程我们再使用以上的方法进行求解,然而JA是对A作一条列的行变换得到的,当n是偶数时,至少要作n/2次行对换,在计算机上将A经行变换变成JA至少要进行3/2n~2次赋值,当n是奇数时,至少要进行3/2n(n-1)次赋值.并且在这个过程中还要增加n个单元的内

  • 标签: Seidel 迭代法 JACOBI 及超 系数矩阵 迭代矩阵
  • 简介:ThepreconditionedGauss-Seideltypeiterativemethodforsolvinglinearsystems,withtheproperchoiceofthepreconditioner,ispresented.ConvergenceofthepreconditionedmethodappliedtoZ-matricesisdiscussed.Alsotheoptimalparameterispresented.NumericalresultsshowthattheproperchoiceofthepreconditionercanleadtoeffectivebythepreconditionedGauss-Seideltypeiterativemethodsforsolvinglinearsystems.

  • 标签: Gauss-Seidel法 预处理迭代法 Z-矩阵 线性系统
  • 简介:Inthispaper,weproposeaparallelGauss-Seideltypeiterativemethodforsolvingthelarge-scalesystemofnonlinearalgebraicequationsAφ(x)+Bψ(x)=b,whichisanasynchronousvariantofthesynchronousparallelnonlinearGauus-SeideltypemethodgivenbyR.E.White.Withalmostthesamebutsomewhatmorerelaxedconstrainteonthemultiplesplittings,weprovetheconvergenceandestimatetheconvergencerateofthenewmethod.

  • 标签: 异步多分裂 弱非线性 Gauss-Seidel型算法 椭圆型偏微分概率方程
  • 简介:TheJacobiandGauss-Seidelalgorithmsareamongthestationaryiterativemethodsforsolvinglinearsystemofequations.Theyarenowmostlyusedasprecondition-ersforthepopulariterativesolvers.Inthispaperageneralizationofthesemethodsareproposedandtheirconvergencepropertiesarestudied.Somenumericalexperimentsaregiventoshowtheefficiencyofthenewmethods.

  • 标签: 广义Jacobi算法 广义Gauss-Seidel法 线性方程组 求解 收敛
  • 简介:文章利用求解线性方程组的Gauss-Seidel迭代法推导出其"反方法",正反两种方法相匹配生成预报-校正系统,给出了它们收敛的条件,并运用这三种不同的公式求解实例,根据其结果,说明这些公式的优缺点。

  • 标签: GAUSS-SEIDEL迭代法 范数 谱半径