Zhou, Bin; Gao, Li; Dai, Yuhong Monotone projected gradient methods for large-scale box-constrained quadratic programming. (English) Zbl 1112.90056 Sci. China, Ser. A 49, No. 5, 688-702 (2006). Summary: Inspired by the success of the projected Barzilai-Borwein (PBB) method for large-scale box-constrained quadratic programming, we propose and analyze the monotone projected gradient methods in this paper. We show by experiments and analyses that for the new methods, it is generally a bad option to compute steplengths based on the negative gradients. Thus in our algorithms, some continuous or discontinuous projected gradients are used instead to compute the steplengths. Numerical experiments on a wide variety of test problems are presented, indicating that the new methods usually outperform the PBB method. Cited in 6 Documents MSC: 90C20 Quadratic programming Keywords:projected gradients; monotone gradient methods; box-constrained quadratic programming; large-scale problems Software:CUTEr; LANCELOT; SifDec; SPG; CUTE PDF BibTeX XML Cite \textit{B. Zhou} et al., Sci. China, Ser. A 49, No. 5, 688--702 (2006; Zbl 1112.90056) Full Text: DOI OpenURL References: [1] Nocedal, J., Wright, S. J., Numerical Optimization, Springer Series in Operations Research, New York: Springer-Verlag, 1999. · Zbl 0930.65067 [2] Goldstein, A. A., Convex programming in Hilbert space, Bulletin of the American Mathematical Society, 1964, 70: 709–710. · Zbl 0142.17101 [3] Levitin, E. S., Polyak, B. T., Constrained minimization problems, USSR Computational Mathematics and Mathematical Physics, 1966, 6: 1–50. · Zbl 0161.07002 [4] Burke, J. V., Moré, J. J., Exposing constraints, SIAM J. Optim., 1994, 4: 573–595. · Zbl 0809.65058 [5] Conn, A. R., Gould, N. I. M., Toint, Ph. 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