Re: [eigen] updated TODO for 3.0

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On Tue, 28 Sep 2010, Benoit Jacob wrote:

   ---> actually i'm thinking more and more that all these
"intermediate" decompositions (also Hessenberg) should rather be kept
internal. What's your opinion?

The message is old (more than a week ago) but I still want to reply to it.

I don't know that much about the bidiagonal decomposition, but the Hessenberg and Schur decompositions are used as a first step in many matrix algorithms. I use Schur for instance when computing matrix functions. So my immediate reaction is that we should expose these decompositions. Why do you want to keep them internal?

If we're not sure about the correct API, we can mark it as unstable for v3.0. Or did we decide that we would no longer have unstable / experimental bits except in unsupported?

Cheers,
Jitse



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