Re: lists of variables
- To: mathgroup at smc.vnet.net
- Subject: [mg58176] Re: lists of variables
- From: Jean-Marc Gulliet <jeanmarc.gulliet at gmail.com>
- Date: Tue, 21 Jun 2005 06:02:50 -0400 (EDT)
- Organization: The Open University, Milton Keynes, England
- References: <d9630u$q1t$1@smc.vnet.net>
- Sender: owner-wri-mathgroup at wolfram.com
Heath Gerhardt wrote:
> I need to make lists of variables, for example
>
> {t1,t2,t3}
>
> but have not been able to figure out how to make Mathematica do this.
> Tried using
>
> Array[t,3]
>
> which gives
>
> {t[1],t[2],t[3]}
>
> but then I don't know how to set the t[i]'s in expressions similar to
>
> F[t[1]_,t[2]_,t[3]_]:=Cos[t[1]+t[2]-t[3]]
>
> thanks in advance
> Heath
>
Is this what you are looking for?
In[1]:=
Table[ToExpression[StringJoin["t", ToString[i]]],
{i, 10}]
Out[1]=
{t1, t2, t3, t4, t5, t6, t7, t8, t9, t10}
We concatenate two strings (having transformed first the integer value
of 'i' into a string), then we convert the resulting string into a
symbol (strings and symbols behave differently in Mathematica even if
sometimes they looks alike on the frontend).
Hope this helps,
/J.M.