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A sparse proximal implementation of the LP dual active set algorithm

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Abstract

We present an implementation of the LP Dual Active Set Algorithm (LP DASA) based on a quadratic proximal approximation, a strategy for dropping inactive equations from the constraints, and recently developed algorithms for updating a sparse Cholesky factorization after a low-rank change. Although our main focus is linear programming, the first and second-order proximal techniques that we develop are applicable to general concave–convex Lagrangians and to linear equality and inequality constraints. We use Netlib LP test problems to compare our proximal implementation of LP DASA to Simplex and Barrier algorithms as implemented in CPLEX.

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Authors and Affiliations

  1. Department of Computer and Information Science and Engineering, University of Florida, Gainesville, PO Box 116120, FL, 32611-6120, USA

    Timothy A. Davis

  2. Department of Mathematics, University of Florida, Gainesville, PO Box 118105, FL, 32611-8105, USA

    William W. Hager

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  1. Timothy A. Davis
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  2. William W. Hager
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Correspondence to William W. Hager.

Additional information

This material is based upon work supported by the National Science Foundation under Grant No. 0203270.

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Davis, T.A., Hager, W.W. A sparse proximal implementation of the LP dual active set algorithm. Math. Program. 112, 275–301 (2008). https://doi.org/10.1007/s10107-006-0017-0

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  • DOI: https://doi.org/10.1007/s10107-006-0017-0

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