Hi Dick,
On Sat, 2004-08-28 at 04:49, richard n. fell wrote:
> Thanks for your reply. Unfortunately, this is not the direct
> product.
Considering most mathematicians will think of the direct product of
groups or universal algebras when they hear the term `direct product'
and may not even realize the use of that term in matrix theory, if you
really want some useful answers it would have been time to explain what
that term in fact means.
Or you could have added a link such as
http://mathworld.wolfram.com/MatrixDirectProduct.html
Note, that Mathematica does not have a MatrixDirectProduct either which
sort of shows the popularity of that construction.
But similar as shown on that web site, it can probably also easily
calculated in maxima.
(I can't tell you how since I have barely started to use Maxima.)
Andreas
> Dick Fell
> go_furuya@infoseek.jp wrote:
> > hi
> > That is posiible.
> > for example
> > (C1) load(diag);
> > (D1) /usr/local/share/maxima/5.9.0/share/contrib/diag.mac
> > (C2) diag([matrix([a0,a1],[a2,a3]),matrix([b1,b2],[b3,b4])]);
> >
> > [ a0 A1 0 0 ]
> > [ ]
> > [ A2 A3 0 0 ]
> > (D2) [ ]
> > [ 0 0 B1 B2 ]
> > [ ]
> > [ 0 0 b3 b4 ]
> > diag(x),x is list of numbers,or list of matrix.
> >
> > Gosei Furuya
> >
> >
> >
> > > Is there a maxima share package that computes the direct product of
> > > matrices? (I can not find any in my maxima).
> > > Thanks,
> > > Dick Fell
--
Andreas J. Guelzow
Taliesin Software, Shelties, Pyr Sheps
and Shetland Sheep