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MathGroup Archive 2000

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Re: Bugs in Abs and Sign !?

  • To: mathgroup at smc.vnet.net
  • Subject: [mg25751] Re: Bugs in Abs and Sign !?
  • From: "Bill Bertram" <wkb at ansto.gov.au>
  • Date: Sat, 21 Oct 2000 14:42:59 -0400 (EDT)
  • Organization: Australian Nuclear Science and Technology Organisation
  • References: <8sjkr7$g3p@smc.vnet.net> <8smdh4$lcb@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

Brian Higgins <bghiggins at ucdavis.edu> wrote in message
news:8smdh4$lcb at smc.vnet.net...
> Jack, There is no bug in my opinion. Mathematica is doing pricesly
> what you requested. When you use replacement rules it is wise to
> carefully examine the FullForm  of your expression. Thus
>
> FullForm[Abs[x^2] ]
>
> Power[Abs[x], 2]
>
> Hence
>
> Abs[x^2] /. Abs[u_] -> fnt[u]
>
> will give
>
> Power[ fnt[x] , 2]
>


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