petsc-3.10.5 2019-03-28

TAOGPCG

gradient projected conjugate gradient algorithm is an active-set conjugate-gradient based method for bound-constrained minimization

	-tao_gpcg_maxpgits	- maximum number of gradient projections for GPCG iterate
	-tao_subset_type	- "subvec","mask","matrix-free", strategies for handling active-sets

beginner