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Zbl 0626.90052
Barnes, Earl R.
A variation on Karmarkar's algorithm for solving linear programming problems.
(English)
[J] Math. Program. 36, 174-182 (1986). ISSN 0025-5610; ISSN 1436-4646/e

The algorithm described in the paper uses the ideas of the original Karmarkar algorithm, but differs in some respects. At first the minimum value of the objective function has not to be known in advance. The algorithm solves the standard form of a linear programming problem with the requirement that the primal and dual problems have no degenerate basic feasible solutions. The algorithm starts from the feasible point $y\in R\sp n$ such that $y\sb i>0$, $i=1$, 2,..., n and produces a monotone decreasing sequence of values of the goal function. The main difference between this algorithm and that given by {\it R. J. Vanderbei}, {\it M. S. Meketon} and {\it B. A. Freedman} [Algorithmica 1, 395-407 (1986; Zbl 0626.90056)] is that the constraint $x\ge 0$ is replaced by $$\sum\sp{n}\sb{i=1}\frac{(x\sb i-y\sb i)\sp 2}{y\sp 2\sb i}<R\sp 2,$$ where $0<R<1$. The convergence of the algorithm is proved and a numerical method for finding a starting point is shown. \par At last in the case of absence of degeneracy it is proved that the algorithm converges to an optimal basic feasible solution with the nonbasic variables converging monotonically to zero.
[M.Todorov]
MSC 2000:
*90C05 Linear programming

Keywords: nondegeneracy; Karmarkar algorithm

Citations: Zbl 0626.90056

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