Sparse quadratic program solver
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        Published on 2010-06-10T03:17:40Z
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This great SO answer points to a good sparse solver, but I've got constraints on x (for  Ax = b) such that each element in x is >=0 an <=N. The first thing which comes to mind is an QP solver for large sparse matrices.
Also, A is huge (around 2e6x2e6) but very sparse with <=4 elements per row.
Any ideas/recommendations?
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