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