Key words: Bound constrained quadratic
programming, Huber's M-estimator, Condition estimation, Newton
iteration, Factorization update.
Last modified January 15, 1997
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Abstract
A bound constrained quadratic program
is solved via a dual problem, which is the minimization of an
unbounded, piecewise quadratic function. The dual problem involves a
lower bound of lambda_1, the smallest eigenvalue of a symmetric,
positive matrix, and is solved by Newton iteration with line search.
The report describes the implementation of the algorithm, including
estimation of lambda_1, how to get a good starting point for the
iteration, and up and downdating of Choleky factorization. Results of
extensive testing and comparison with other methods for constrained
QP are given.IMM Technical Report 21/96
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