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MathGroup Archive 1998

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Structure modification and related questions

  • To: mathgroup at smc.vnet.net
  • Subject: [mg13857] Structure modification and related questions
  • From: "Roberto Moriyon" <Roberto.Moriyon at ii.uam.es>
  • Date: Wed, 2 Sep 1998 01:30:54 -0400
  • Organization: Universidad Autonoma de Madrid, Spain
  • Sender: owner-wri-mathgroup at wolfram.com

Hello,

I am working with a big structure (actually, it is a list), like

x=Table[i, {i,10000}]

Q.1) Can I modify x[[3]], let's say, without having to create another
list of 10000 elements? (the obvious thing for me to try, x[[3]]=0,
does not work).

Q.2) In the same spirit, are there any functions similar to Insert and
Delete, that modify directely the expression affected by them, without
taking a whole copy?

Q.3) Related to Q.1&2, is it possible in Mathematica that two structures
(or lists, for that sake) have some parts in common? What I mean by
this is that, for example, I would like to have the variable x equal to
the second element of {1,{2,3},4}, so that in case the 3 is changed by
a 5 in one of them, it is also changed in the other one.

Thank you for any help you can give me on this

Roberto Moriyon

--

Roberto Moriyon
Departamento de Ingenieria Informatica Universidad Autonoma de Madrid
28049 Madrid

Phone: +34-91-397-4350
Fax: +34-91-397-5277



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