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Conversion of Orderless functions to non Orderless one

• To: mathgroup at smc.vnet.net
• Subject: [mg24046] Conversion of Orderless functions to non Orderless one
• From: zhl67 at hotmail.com
• Date: Wed, 21 Jun 2000 02:20:06 -0400 (EDT)
• Sender: owner-wri-mathgroup at wolfram.com

Hi, there

My question might be silly to somebody out there but it really bothers
me: Is there any way to convert an orderless function into non
orderless ones for a certain range of arguments?

For instance, let's say have a set Operators:

Operators={a,b,c}

What I wanted to do is that whenever expressions like Times[b,a,c] is
entered, the outcome should look like b**a**c (i.e. Times turned into
NonCommutativeMultiply). The special requirement is that this change
happens only for members of the set Operators (otherwise I can just
ClearAttributes[Times,Orderless] ), and that the output keeps the order
of the input argument, i.e. it should be b**a**c, NOT a**b**c. Could
anyone help the case?

Liu Zhao
Univ. York, UK


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• Follow-Ups:
  • Re: Conversion of Orderless functions to non Orderless one
    • From: Carl Woll <carlw@u.washington.edu>
  • Re: Conversion of Orderless functions to non Orderless one
    • From: Daniel Lichtblau <danl@wolfram.com>