Re: [boost] [rfc] A light weight statically typed matrix template class (again?)

From: Dave Steffen (dgsteffen_at_[hidden])
Date: 2007-12-19 11:24:28

On Wednesday 19 December 2007, Steve M. Robbins wrote:
> On Tue, Dec 18, 2007 at 03:02:12PM -0700, Dave Steffen wrote:
> > On Tuesday 18 December 2007, Martin Bonner wrote:
[...]
> > > There is rather less discussion about possible interfaces for complex
> > > numbers than for matrices.  (The last time I used matrices in my code,
> > > I wanted A=B*C to mean A[i,j] = B[i,j]*C[i,j].)
> >
> >   Interesting: that's a direct product, which we hardly ever use.
>
> I don't think that's a direct product; c.f.
> http://mathworld.wolfram.com/MatrixDirectProduct.html
>
> Wikipedia suggests it's called the Hadamard (or Schur or entrywise)
> product; c.f. http://en.wikipedia.org/wiki/Matrix_multiplication
>
> Yours pedantically,
> -Steve

  Whoops, yes, you're right.  I think we've used a direct product once
  here (in experimental code that no longer exists), and I didn't
  write it. :-)

  Thanks.

-- 
Dave Steffen - Software Engineer 4
Numerica Corporation (www.numerica.us <http://www.numerica.us/> )