Subject correction -- should be "TMatrixDEigen problems"

On Fri, 1 Jun 2012, Arthur E. Snyder wrote:

> Hi Rooters,
>
> I am having trouble with |TMatrixDEigen| for larger matrices. I have made
> 200x200 matrices of correltions which I'm trying to digagonalize. It
> mostly works, but sometimes fails with
>
> root [13] TMatrixDEigen emat(*scanMatrix)
> Error in <MakeSchurr>: too many iterations
>
> It apparently thinks the matrix is too close to singular.
>
> However, I can still find diagonalilzed variables with ugly, homemade
> Gram-Schmidt (which I'm trying to replace with something better).
>
> The matrix that gives trouble has in fact smaller correlations than some
> of the ones that work successfully.
>
> So what's going on here? And how do I fix it? Do I have to move beyond
> root?
>
> -AE
>
>
>
>
>
>
>
> A.E. Snyder, The Former Group C (TFC) \!c*p?/
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> http://www.slac.stanford.edu/~snyder BaBar
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Received on Fri Jun 01 2012 - 22:19:38 CEST