Re: [MATH] Re: Pivoting QR Decomposition: Take Two!

[Greg Sterijevski]

If you really think about, all of the decomposition classes should be
handled by factories. The decompositions all seem to occur in the
constructor. Everything else is derived from those results, so one could
argue that the actual decomposition code could be written very procedurally
and put into the factory as a static private method. The returned class from
the factory would be nothing more than a container of the results and
methods to get the data and derivatives of the data.