Services & Resources / Wolfram Forums
-----
 /
MathGroup Archive
1998
*January
*February
*March
*April
*May
*June
*July
*August
*September
*October
*November
*December
*Archive Index
*Ask about this page
*Print this page
*Give us feedback
*Sign up for the Wolfram Insider

MathGroup Archive 1998

[Date Index] [Thread Index] [Author Index]

Search the Archive

Replacement rules in NonCommutative Algebra Package

  • To: mathgroup at smc.vnet.net
  • Subject: [mg13748] Replacement rules in NonCommutative Algebra Package
  • From: Nam-Anh Nguyen <anh at chm.ulaval.ca>
  • Date: Wed, 19 Aug 1998 01:38:35 -0400
  • Sender: owner-wri-mathgroup at wolfram.com

Hi experts,

I've been using NonCommutative Algebra package for alsmost one year and
well aware of the fact that the Mathematica replacement operator /. ->
does not work appropriately within this package. Instead I must use the
Substitute command of this NCAlgebra package.

However I've impression that this command does not allow one to work
with replacement rules that contain conditions

For instance, after loading the package I enter

        Substitute[x**a**b,a**b->c]
and the result is
         x**c

which is correct

Next:

        CommutativeQ[a]
        False

but

    Substitute[x**a**b,a**b->c/;CommutativeQ[a]] gives
    x**(c/;CommutativeQ[a])

which is not correct. (It should give the original expression, i.e.
x**a**b, as the condition  fails)

Is that a bug??
Any suggetion??

Thank you for your help

Nam-Anh



  • Prev by Date: Re: .nb and .m MIME types?
  • Next by Date: Re: Running 3.0 remotely
  • Previous by thread: Re: Null in output problem
  • Next by thread: Integrals