Rounding of polytopes in the real number model of computation

Rounding of polytopes in the real number model of computation
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DOI:
10.1287/moor.21.2.307
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发表时间:
1996-05-01
影响因子:
1.7
通讯作者:
Khachiyan, LG
Khachiyan, LG
中科院分区:
数学2区
文献类型:
--
作者:
Khachiyan, LG

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令A为R(n)中的一组M点。我们表明(1 + epsilon)n连接的问题是,计算椭圆形E子集或等于r(n)的问题,因此[(1 + epsilon)n]( - 1) E子集或等于Conv。船体(a)子集的子集或等于e,可以在O(Mn(2)(epsilon(-1) + in m in m))中求解算术操作和比较。该结果意味着,可以在O(m epsilon(-1))操作的O(m(3.5))操作中求解近似于A的最小体积椭圆形的问题,以达到体积中Epsilon的相对精度。后者的结合也适用于(1 + epsilon)n连接问题。我们的界限适用于实际数量的计算模型。
Let A be a set of m points in R(n). We show that the problem of (1 + epsilon)n-rounding of A,, i.e., the problem of computing an ellipsoid E subset of or equal to R(n) such that [(1 + epsilon)n](-1)E subset of or equal to conv. hull(A) subset of or equal to E, can be solved in O(mn(2)(epsilon(-1) + In n + In In m)) arithmetic operations and comparisons. This result implies that the problem of approximating the minimum volume ellipsoid circumscribed about A can be solved in O(m(3.5) In(m epsilon(-1))) operations to a relative accuracy of epsilon in the volume. The latter bound also applies to the (1 + epsilon)n-rounding problem. Our bounds hold for the real number model of computation.