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MathGroup Archive 2008

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Re: Changing names of variables in a loop

  • To: mathgroup at smc.vnet.net
  • Subject: [mg92233] Re: Changing names of variables in a loop
  • From: "David Park" <djmpark at comcast.net>
  • Date: Tue, 23 Sep 2008 07:36:00 -0400 (EDT)
  • References: <gb7obt$ngj$1@smc.vnet.net>

a1 = 1; a2 = 2; a3 = 3;
func[g_] := g;
Summa = 0;
For[i = 1, i <= 3, i += 1, Summa += func[Symbol["a" <> ToString[i]]]]
Summa
6

Or maybe simpler with Functional programming:

a[1] = 1; a[2] = 2; a[3] = 3;
Total@Array[a, 3]
6

-- 
David Park
djmpark at comcast.net
http://home.comcast.net/~djmpark/  


<kazik.lakomy at gmail.com> wrote in message news:gb7obt$ngj$1 at smc.vnet.net...
> Hi,
> do you know maybe is there a possibility to change a name of a
> variable in a loop? I'm not exactly sure how to explain it, so maybe
> instead of my words I paste a basic example that express my query:
> 
> a1 = 1; a2 = 2; a3 = 3;
> func[g_] := g;
> Summ = 0;
> 
> For[i = 1, i <= 3, i += 1,
> Summa += func[ai]]
> 
> So something like this... I have tried to deal with this like with
> strings and have put func[a<>"i"] but it didn't work (quite logic).
> The general problem is much more complicated, this is only a part of
> it, so please do not suggest me how can I sum up three numbers, this I
> believe I know :) I would very appreciate any hints,
> Best regards,
> Kazik
>


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