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MathGroup Archive 2003

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Re: Symbols and Lists

  • To: mathgroup at smc.vnet.net
  • Subject: [mg39864] Re: Symbols and Lists
  • From: Friedrich Laher <mathefritz at schmieder-laher.de>
  • Date: Sun, 9 Mar 2003 05:28:16 -0500 (EST)
  • Organization: 1&1 Internet AG
  • References: <b4c8e4$n7k$1@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

it's somewhat desperate, maybe a better way is possible
(
the infixoperator "<>" joins strings
)
ss = {"a", "b", "c", "d", "e"}

dd = {1, 5, {3, 4}, 7, abc, {0.1, 0.001}, 3.1415}

  ToExpression[ ss[[3]] <> "=" <> ToString[ dd[[4]]  ] ] ]

Goyder Dr HGD schrieb:
> 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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