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MathGroup Archive 2003

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Re: Symbols and Lists

  • To: mathgroup at smc.vnet.net
  • Subject: [mg39859] Re: [mg39832] Symbols and Lists
  • From: Andrzej Kozlowski <akoz at mimuw.edu.pl>
  • Date: Sun, 9 Mar 2003 05:26:42 -0500 (EST)
  • Sender: owner-wri-mathgroup at wolfram.com

Evaluate[ss[[3]]] = dd[[4]]

will do what you want.

Andrzej Kozlowski
Yokohama, Japan
http://www.mimuw.edu.pl/~akoz/
http://platon.c.u-tokyo.ac.jp/andrzej/


On Saturday, March 8, 2003, at 04:49  pm, Goyder Dr HGD wrote:

> Dear MathGroup,
>
> I am doing something much more complicated but this trivial example
> expresses my difficulty.
>
> If I have a list of symbols and a list of data such as
>
> ss = {a, b, c, d, e}
>
> dd = {1, 5, {3, 4}, 7, abc, {0.1, 0.001}, 3.1415}
>
> how do I take a symbol from the list ss and associated it with data 
> from the
> list dd?
>
> A wrong attempt is to try
>
> ss[[3]] = dd[[4]]
>
> This replaces element 3 in ss with element 4 from dd.
>
> What I need is an assignment so that, in this case, the symbol c is
> associated with the data. Equivalent to writing
>
> c = dd[[4]]
>
> so that c could then be used in subsequent expressions and the list ss 
> is
> unchanged.
>
> Note that this is a trivial example for pedagogic purposes - I can't 
> do the
> simple assignment in my actual case.
>
> Thanks
>
> Hugh Goyder
>
>
>
>



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