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MathGroup Archive 2006

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Re: Matrix Multiplication (with a twist)

  • To: mathgroup at
  • Subject: [mg68991] Re: Matrix Multiplication (with a twist)
  • From: "Jens-Peer Kuska" <kuska at>
  • Date: Sat, 26 Aug 2006 02:04:30 -0400 (EDT)
  • Organization: Uni Leipzig
  • References: <ecmhcp$9kl$>
  • Sender: owner-wri-mathgroup at


Inner[NonCommutativeMultiply, A, B]




"Bruce Colletti" <vze269bv at> schrieb im 
Newsbeitrag news:ecmhcp$9kl$1 at
| 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

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