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Matrix multiplication speed up

  • To: mathgroup at
  • Subject: [mg83072] Matrix multiplication speed up
  • From: Frank Brand <frank.brand at>
  • Date: Fri, 9 Nov 2007 05:19:01 -0500 (EST)
  • References: <fgs87d$3uh$>

  Hi all,

thanks for responding!
I should be more precise in what I´m looking for.
What I'm especially interested in is the preserved order of  FACTORS in 
the sums of the components of the resulting product of the two matrices, 
so e.g.
I'd like to have a[2,1]*a[27,3]*a[1,5] instead of a[1,5]*a[2,1]*a[27,3] 
(Mathematica's natural order), because I'm interested in the resulting 
index sets like {2, 1, 27, 3, 1, 5}.
Do you have any idea how to realize this?


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