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Adding elements of a matrix

• To: mathgroup at smc.vnet.net
• Subject: [mg40583] Adding elements of a matrix
• From: Rebeca Choy <rchoy at ula.ve>
• Date: Thu, 10 Apr 2003 03:42:37 -0400 (EDT)
• Sender: owner-wri-mathgroup at wolfram.com

Hi,

How can I add in Mathematica every element of a matrix without adding 
twice the mixed terms?

for example i have a matrix m[[i,j]] and i want to add every term where 
i<j (this is to avoiding adding twice the same number)

Can I do it with Sum?

Rebeca Choy

• Follow-Ups:
  • Re: Adding elements of a matrix
    • From: Dr Bob <majort@cox-internet.com>