Re: Changing names of variables in a loop

*To*: mathgroup at smc.vnet.net*Subject*: [mg92199] Re: Changing names of variables in a loop*From*: Jean-Marc Gulliet <jeanmarc.gulliet at gmail.com>*Date*: Tue, 23 Sep 2008 07:29:30 -0400 (EDT)*Organization*: The Open University, Milton Keynes, UK*References*: <gb7obt$ngj$1@smc.vnet.net>

kazik.lakomy at gmail.com wrote: > 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, Use array/function notation: 'someName'['someNumber'] (w/o the quotation marks). For instance, In[1]:= a[1] = 1; a[2] = 2; a[3] = 3; func[g_] := g; Summ = 0; For[i = 1, i <= 3, i += 1, Summ += func[a[i]]] Summ Sum[a[i], {i, 1, 3}] Out[5]= 6 Out[6]= 6 Regards, -- Jean-Marc