Re: Symbols and Lists

• To: mathgroup at smc.vnet.net
• Subject: [mg39876] Re: [mg39832] Symbols and Lists
• From: Dr Bob <drbob at bigfoot.com>
• Date: Sun, 9 Mar 2003 05:30:15 -0500 (EST)
• References: <200303080749.CAA23600@smc.vnet.net>
• Sender: owner-wri-mathgroup at wolfram.com

```ss = {a, b, c, d, e}
dd = {1, 5, {3, 4}, 7, abc, {0.1, 0.001}, 3.1415}
ToExpression[ToString@ss[[3]] <> "=" <> ToString@dd[[4]]];
c

Bobby

On Sat, 8 Mar 2003 02:49:47 -0500 (EST), Goyder Dr HGD
<H.Goyder at rmcs.cranfield.ac.uk> 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
>
>
>

--
majort at cox-internet.com
Bobby R. Treat

```

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