Forum: help


RE: sparse cholesky for symmetric semi-indefi [ Reply ] By: Martin Maechler on 2008-04-14 07:53 | [forum:509] |
It is only symmetric when A is symmetric, but I assume you meant that. The question is an interesting one, an related to recent additions in the Matrix package. Can you please provide a reproducible example? Regards, Martin |
sparse cholesky for symmetric semi-indefinite [ Reply ] By: russ taylor on 2008-04-11 14:40 | [forum:508] |
Is it possible to compute LDL' for a metrix of the form: | A X'| | X 0 | Although, CHOLMOD documentation indicates "some support", R-Matrix does not recognize this as "symmetric". thanks, rt |