Re: Matrix Multiplication (with a twist)
- To: mathgroup at smc.vnet.net
- Subject: [mg68985] Re: [mg68951] Matrix Multiplication (with a twist)
- From: Bob Hanlon <hanlonr at cox.net>
- Date: Sat, 26 Aug 2006 02:04:20 -0400 (EDT)
- Reply-to: hanlonr at cox.net
- Sender: owner-wri-mathgroup at wolfram.com
A = {{e,f},{g,h}};
B = {{a,b},{c,d}};
Inner[NonCommutativeMultiply, A, B]
{{e**a + f**c, e**b + f**d}, {g**a + h**c, g**b + h**d}}
Bob Hanlon
---- Bruce Colletti <vze269bv at verizon.net> wrote:
> For matrix A = {{e,f},{g,h}} and B = {{a,b},{c,d}}, Mathematica returns their product
>
> A.B = {{ae+cf,be+df},{ag+ch,bg+dh}}
>
> However, I want to treat multiplication of numeric variables as noncommutative in order to instead obtain the result
>
> {{ea+fc, eb+fd},{ga+hc,gb+hd}}
>
> How would this be done in v5.2? Thanks.
>
> Bruce
>