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MathGroup Archive 2001

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Re: Patterns Problem

  • To: mathgroup at
  • Subject: [mg28170] Re: [mg28151] Patterns Problem
  • From: BobHanlon at
  • Date: Tue, 3 Apr 2001 02:37:48 -0400 (EDT)
  • Sender: owner-wri-mathgroup at

See on-line help for NonCommutativeMultiply

Bob Hanlon

In a message dated 2001/4/2 2:36:19 AM, jkawczak at writes:

>I am trying to force an output to appeat in  a certain way, but without
>success. Here is my problem.
>First, how to "teach" M. that some symbols are matrices, vectors, etc...
>that the laws of the real arithmetic do not apply.
>Let's take A to be a matrix, and u and v, vectors.
>I would like to have the following:
>u A (u - )=u A u -u A 
>the operator is not symmetric. Whenever I do this oparation I get
>something like
>A u u or A u ^2. I just cannot force the order to be correct!
>Also, I would like to have the oparator to
>be iterative, i.e.
>v A {(u A (u - ) -<u A (u - )>}
>=v A u A u - v A u A  - v A <u A u> + v A u A , and so on.

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