I think that's what I'm saying, yes. Small rows X shouldn't become large rows of A -- and similarly small changes in X shouldn't mean large changes in A. Not quite the same thing but both are relevant. I see that this is just the ratio of largest and smallest singular values. Is there established procedure for evaluating the ill-conditioned-ness of matrices -- like a principled choice of threshold above which you say it's ill-conditioned, based on k, etc.?
On Thu, Apr 4, 2013 at 3:19 PM, Koobas <[email protected]> wrote: > So, the problem is that the kxk matrix is ill-conditioned, or is there more > to it? >
