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/> )