Absolute Value Equation Solution via Concave Minimization


Professor Olvi Mangasarian
Department of Mathematics
University of California, San Diego

Abstract

The NP-hard absolute value equation (AVE) Ax-|x|=b where A is an n-by-n real matrix and b is an n-by-1 real vector is solved by a succession of linear programs. The linear programs arise from a reformulation of the AVE as the minimization of a piecewise-linear concave function on a polyhedral set and solving the latter by successive linearization. A simple MATLAB implementation of the successive linearization algorithm solved 100 consecutively generated 1000-dimensional random instances of the AVE with only five violated equations out of a total of 100,000 equations. Paper is available at: ftp://ftp.cs.wisc.edu/pub/dmi/tech-reports/06-02.pdf