combinatorial grouping

[Juan Pablo Carbajal]

Hi,

Does anybody know about "solving normal equations using combinatorial grouping"?
Apparently, it is described in "M. H. Van Benthem and M. R. Keenan, J.
Chemometrics 2004; 18: 441-450"

If it is already implemented in Octave: Under what name/function?
If it is not implemented in Octave: Is it worth a new file in OF linear-algebra?

You can find the code for the method in line 583 of
main/linear-algebra/devel/nmf_bpas.m (subfunction called
solveNormalEqComb).

Thanks

-- 
M. Sc. Juan Pablo Carbajal
-----
PhD Student
University of Zürich
http://ailab.ifi.uzh.ch/carbajal/