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Re: Changing names of variables in a loop

• To: mathgroup at smc.vnet.net
• Subject: [mg92194] Re: Changing names of variables in a loop
• From: dh <dh at metrohm.ch>
• Date: Mon, 22 Sep 2008 07:24:02 -0400 (EDT)
• References: <gb7obt$ngj$1@smc.vnet.net>

Hi Kazik,

obviously your ai is a function of i. Therefore, simply define this 

function:

ai[1]=1; ai[2]=2; ai[3]=3;

For[i = 1, i <= 3, i += 1, Summa += func[ai[i]]]

you could do something similar with an array. This is less flexible but 

faster.

hope this helps, Daniel



kazik.lakomy at gmail.com wrote:

> 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

> 





-- 



Daniel Huber

Metrohm Ltd.

Oberdorfstr. 68

CH-9100 Herisau

Tel. +41 71 353 8585, Fax +41 71 353 8907

E-Mail:<mailto:dh at metrohm.com>

Internet:<http://www.metrohm.com>