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Conditonal sum

• To: mathgroup at smc.vnet.net
• Subject: [mg50263] Conditonal sum
• From: "Christopher Grinde" <christopher.grinde at hive.no>
• Date: Mon, 23 Aug 2004 06:34:44 -0400 (EDT)
• Organization: Vestfold University College
• Sender: owner-wri-mathgroup at wolfram.com

I am new to mathematica and could really need a tip on how to implement a 
conditional sum.  Pseudocode would be something like this


EndSum=a;
if j in Sm:
	EndSum=EndSum+f[j]
end


I have tried doing this by using an If-clause inside the sum-function, but  

this seems little elegant and is nor very suitable for symbolic calculations.

Any advice would be highly appreciated

Christopher Grinde