Re: more QR & Cholesky updating functions

[David Bateman]

Jaroslav Hajek wrote:
> hello,
>
> in addition to the function QRUPDATE, QRINSERT, QRDELETE and
> CHOLUPDATE, I'm also implementing
> QRSHIFT (circular column shift), CHOLINSERT (insert row&column),
> CHOLDELETE (delete row&column) and
> CHOLSHIFT (circular symmetric row&col shift). these four operations
> supplement the already implemented four,
> in a certain sense they "complete" the set of modifications that can
> be done as level-2 operations with
> Givens rotations. (note that any row permutation of QR is trivial).
>
> The previous updating subroutines were wrapped as methods of the QR
> and CHOL classes, with DEFUN wrappers
> going in DLD-FUNCTIONS/qr.cc and chol.cc.
> However, these latter four are not found in MATLAB (why?). Can I
> follow the same scenario, or try implementing
> them differently (perhaps in Octave-Forge)?
>
>
>   
If they aren't in the core of Matlab, should they go in the core of
Octave? If they are in the core of Octave they should probably form part
of the Chol and QR classes

D.

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