Can I ask what applications this "Hadamard product" has?

Bill.

On 15 June, 17:32, William Stein <wst...@gmail.com> wrote:
> On Mon, Jun 15, 2009 at 6:17 PM, John Cremona<john.crem...@gmail.com> wrote:
>
> > 2009/6/15 Jason Grout <jason-s...@creativetrax.com>:
>
> >> William Stein wrote:
> >>> On Mon, Jun 15, 2009 at 5:26 PM, paramaniac<luka...@student.ethz.ch> 
> >>> wrote:
> >>>>> Sorry, I don't understand your example.
> >>>>> If
> >>>>> A1 = matrix([[a1,b1],[c1,d1]])
> >>>>> A2 = matrix([[a2,b2],[c2,d2]])
> >>>>> then
> >>>> A1.*A2 = matrix([[a1*a2, b1*b2],[c1*c2, d1*d2]])
>
> >>> (1) we aren't going to add the .* notation A1 .* A2 to sage, since
> >>> there has to be a *very* very strong
> >>> demand to ever add anything new the preparser.  We haven't added
>
> >> I think William meant "never add"...
>
> > No, he meant what he said!
>
> > John
>
> "When I use a word," Humpty Dumpty said, in a rather scornful tone,
> "it means just what I choose it to mean—neither more nor less."
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