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Re: Adding elements of a matrix

  • To: mathgroup at smc.vnet.net
  • Subject: [mg40612] Re: [mg40583] Adding elements of a matrix
  • From: Sseziwa Mukasa <mukasa at jeol.com>
  • Date: Fri, 11 Apr 2003 02:01:43 -0400 (EDT)
  • Sender: owner-wri-mathgroup at wolfram.com

On Thursday, April 10, 2003, at 03:42 AM, Rebeca Choy wrote:

> 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?
>

Yes,

Sum[m[[i,j]] ,{j,1,Length[m[[1]]]},{i,1,j-1}]

Regards,

Ssezi



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