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arXiv 0803.0925math.OC
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线性规划条件数的鲁棒光滑分析

Robust Smoothed Analysis of a Condition Number for Linear Programming

Peter Bürgisser, Dennis Amelunxen

摘要:

我们对线性规划可行性问题\exists x \in \R^{m+1} Ax < 0的GCC-条件数C(A)进行平滑分析.假设\bar{A}是任何行\bar{a_i}为欧几里德范数1的矩阵,并且对于所有i独立地,设a_i是\bar{a_i}的随机扰动,其遵循在角半径为\arcsin σ且以\bar{a_i}为中心的S^m中的球形圆盘中的均匀分布。证明了E(\ln C(A))= O(mn / σ). Dunagan、Spielman和Teng [arXiv:cs.DS/0302011]对Renegar的条件数和高斯扰动给出了类似的结果。我们的结果是稳健的,因为它很容易扩展到半径为\arcsin σ的球形圆盘上支持的径向对称概率分布,其密度甚至可能在扰动中心具有奇异性。我们的证明结合了Bürgisser,Cucker和Lotz(Math.Comp.77,No.263,2008)最近的一篇论文中的思想和Dunagan等人的技术。

英文摘要:

We perform a smoothed analysis of the GCC-condition number C(A) of the linear programming feasibility problem \exists x\in\R^{m+1} Ax < 0. Suppose that \bar{A} is any matrix with rows \bar{a_i} of euclidean norm 1 and, independently for all i, let a_i be a random perturbation of \bar{a_i} following the uniform distribution in the spherical disk in S^m of angular radius \arcsinσand centered at \bar{a_i}. We prove that E(\ln C(A)) = O(mn / σ). A similar result was shown for Renegar's condition number and Gaussian perturbations by Dunagan, Spielman, and Teng [arXiv:cs.DS/0302011]. Our result is robust in the sense that it easily extends to radially symmetric probability distributions supported on a spherical disk of radius \arcsinσ, whose density may even have a singularity at the center of the perturbation. Our proofs combine ideas from a recent paper of Bürgisser, Cucker, and Lotz (Math. Comp. 77, No. 263, 2008) with techniques of Dunagan et al.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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