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 >