Re: Summation question

*To*: mathgroup at smc.vnet.net*Subject*: [mg85708] Re: [mg85664] Summation question*From*: Bob Hanlon <hanlonr at cox.net>*Date*: Tue, 19 Feb 2008 07:08:23 -0500 (EST)*Reply-to*: hanlonr at cox.net

s = Prime /@ Range[6] {2,3,5,7,11,13} Total[f /@ s] f(2)+f(3)+f(5)+f(7)+f(11)+f(13) Plus @@ f /@ s f(2)+f(3)+f(5)+f(7)+f(11)+f(13) Sum[f[s[[i]]], {i, 6}] f(2)+f(3)+f(5)+f(7)+f(11)+f(13) Bob Hanlon ---- Robert Pigeon <robert.pigeon at videotron.ca> wrote: > Good day all, > > I want to make a summation like this: Sum[f[i],{i, start, > finish}]. What I want is that the sum be over a specific set like > {1,3,5,7,11,13}. So the sum would be : f[1]+f[3]+f[5]+f[7]+f[11]+f[13]. The > set I want to use is the primes. So, how do I use, if possible, Sum over a > specific set ? > > > > Thanks, > > > > Robert > > > > Robert Pigeon > >