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MathGroup Archive 2000

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Defining an UpValue for a specific List?

  • To: mathgroup at smc.vnet.net
  • Subject: [mg23153] Defining an UpValue for a specific List?
  • From: Claudius Schnorr <schnoerr at mailzone.com>
  • Date: Thu, 20 Apr 2000 03:21:20 -0400 (EDT)
  • Organization: T-Online
  • Sender: owner-wri-mathgroup at wolfram.com

Hello, 

I would like to make the following definition:

df[[a_, b_]] ^:= DFPart[df, a_, b_]
 
where df is a list of three components.

I get the folowing error:

UpSetDelayed::write: Tag List in {<<l>>}[[a_,b_]] is Protected.

Is there a possibility to redefine Part[] for some symbols?

Please email directly to
        schnoerr at mailzone.com

Thank you very much!

Claudius

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40547 D"usseldorf / Germany       e-mail: schnoerr at mailzone.com
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