On the computation of C* certificates

  • Authors:
  • Florian Jarre;Katrin Schmallowsky

  • Affiliations:
  • Mathematisches Institut, University of Düsseldorf, Düsseldorf, Germany 40225;Mathematisches Institut, University of Düsseldorf, Düsseldorf, Germany 40225

  • Venue:
  • Journal of Global Optimization
  • Year:
  • 2009

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Abstract

The cone of completely positive matrices C* is the convex hull of all symmetric rank-1-matrices xx T with nonnegative entries. While there exist simple certificates proving that a given matrix $${B\in C^*}$$ is completely positive it is a rather difficult problem to find such a certificate. We examine a simple algorithm which--for a given input B--either determines a certificate proving that $${B\in C^*}$$ or converges to a matrix $${\bar S}$$ in C* which in some sense is "close" to B. Numerical experiments on matrices B of dimension up to 200 conclude the presentation.