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MathGroup Archive 2003

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Symbols and Lists

  • To: mathgroup at smc.vnet.net
  • Subject: [mg39832] Symbols and Lists
  • From: Goyder Dr HGD <H.Goyder at rmcs.cranfield.ac.uk>
  • Date: Sat, 8 Mar 2003 02:49:47 -0500 (EST)
  • Sender: owner-wri-mathgroup at wolfram.com

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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