Variations on the retraction algorithm for symmetric indefinite banded matrices Linda Kaufman
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Use planar transformations to eliminate With block methods get 1) basic triangular shape 2) super long columns 3) short columns which don’t fit into rank k correction or vanish
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Variations on the retraction algorithm for symmetric ...
With block methods get. 1) basic triangular shape. 2) super long columns. 3) short columns which don't fit into rank k correction or vanish. x x x x x x. x x x x x x x. x x x x x x x x. x x x x x x x x x r r r. x x x x x x x x x x r r. x x x x x x x x x x x r. x x x x x x x x x x x. x x x x x x x x x x x. x x x x x x x x x x x r x x x x x x x x x x x.
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This heuristic is incomplete because it does not provide a tiebreaking rule. Our computer experiments confirm the conventional wisdom that arbitrary tiebreaking is likely to produce a tour on a square board of dimension smaller than 50. But our exper
