Re: Summation question
- To: mathgroup at smc.vnet.net
- Subject: [mg85743] Re: [mg85664] Summation question
- From: Sseziwa Mukasa <mukasa at jeol.com>
- Date: Wed, 20 Feb 2008 07:06:10 -0500 (EST)
- References: <200802190647.BAA27190@smc.vnet.net>
On Feb 19, 2008, at 1:47 AM, Robert Pigeon 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 ?
One way is to map the sum indices to the set elements eg:
Sum[f[Prime[i]],{i,start,finish}]
but this may present problems if the sum is over an infinite range.
Regards,
Sseziwa
- Follow-Ups:
- Re: Re: Summation question
- From: Andrzej Kozlowski <akoz@mimuw.edu.pl>
- Re: Re: Summation question
- References:
- Summation question
- From: Robert Pigeon <robert.pigeon@videotron.ca>
- Summation question