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 Oct 18 awarded Popular Question Sep 10 revised How to simplify $(aX+D)^{-1}$ added 172 characters in body Sep 10 comment How to simplify $(aX+D)^{-1}$ Thanks for pointing this out. Yet I am not looking at rank one matrix so the answer provided may not be helpful at all. Sep 10 comment How to simplify $(aX+D)^{-1}$ @Deliasaghi Thanks for the reference but I am not looking at rank one matrix Sep 10 revised How to simplify $(aX+D)^{-1}$ added 12 characters in body Sep 10 comment Creating a sparse matrix from a dense matrix Are you actually asking about how to do dimensionality reduction? If yes you can check PCA Sep 10 asked How to simplify $(aX+D)^{-1}$ Aug 5 comment Which function is suitable to approximate a convex piecewise linear function @BrianTung Can you provide me those candidate functions which you think is suitable in this case? Aug 5 revised Which function is suitable to approximate a convex piecewise linear function added 10 characters in body Aug 5 comment Which function is suitable to approximate a convex piecewise linear function Yes $a_i$ is always greater than $0$. But apart from that I think there is nothing more I can add. Aug 5 comment Which function is suitable to approximate a convex piecewise linear function @BrianTung Thanks. Ive added more details about the piecewise linear function Aug 5 revised Which function is suitable to approximate a convex piecewise linear function added 169 characters in body Aug 5 asked Which function is suitable to approximate a convex piecewise linear function Apr 17 awarded Popular Question Feb 7 awarded Famous Question Sep 5 awarded Popular Question Jul 2 awarded Curious Jul 2 awarded Inquisitive Jun 23 accepted Is Minimax equals to Maximin? Jun 20 revised Is Minimax equals to Maximin? added 1 character in body