Bound constrained minimization gpcg.tar is the implementation of the More-Toraldo version of the conjugate gradient method combined with gradient projection. There is presently no preconditioner built in. (Source: http://plato.asu.edu)
References in zbMATH (referenced in 1 article )
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- Li, Wu; de Nijs, J.J.: An implementation of the QSPLINE method for solving convex quadratic programming problems with simple bound constraints. (2003)