Re: Changing names of variables in a loop

*To*: mathgroup at smc.vnet.net*Subject*: [mg92189] Re: Changing names of variables in a loop*From*: Jens-Peer Kuska <kuska at informatik.uni-leipzig.de>*Date*: Mon, 22 Sep 2008 07:10:05 -0400 (EDT)*Organization*: Uni Leipzig*References*: <gb7obt$ngj$1@smc.vnet.net>*Reply-to*: kuska at informatik.uni-leipzig.de

Hi, a) what is with a[1] = 1; a[2] = 2; a[3] = 3; and Sum[a[i],{i,1,3}] b) if you like it more complicated a1 = 1; a2 = 2; a3 = 3; func[g_] := g; sum = 0; Do[ sum += func[ToExpression["a" <> ToString[i]]], {i, 1, 3}] Regards Jens 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 >