Re: silly problem

*To*: mathgroup at smc.vnet.net*Subject*: [mg85310] Re: silly problem*From*: Szabolcs Horvát <szhorvat at gmail.com>*Date*: Tue, 5 Feb 2008 19:44:11 -0500 (EST)*References*: <fo9g1h$sbm$1@smc.vnet.net>

Francis Bitonti wrote: > I'm new to Mathematica so this is a very basic question I think. but on= e > that has me hung up. I keep getting this error > > Set::write: Tag List in {0,0,0,0,0,0,0,0}[1] is Protected. >> Most probably you had something assigned to 'k', e.g. In[1]:= k = {1, 2} Out[1]= {1, 2} In[2]:= k[1] = 2 During evaluation of In[2]:= Set::write: Tag List in {1,2}[1] is \ Protected. >> Out[2]= 2 > > > my code looks like this. > > *IN:* > For[i = 1, i < 6 , i++, > Print[ > g = i; > k[g] = twoDcalc[e1, a1, nodes[[{edges[[g, 1]], edges[[g, 2]]}]]] > ]] You might find is useful to avoid functions like For[] and explicit assignments inside calculations, so that these kind of variable-name collisions do not occur. Or just use Module[] to localize variables. Szabolcs Horv=E1t