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Vectorizing a summation

From: rdelgado
Subject: Vectorizing a summation
Date: Tue, 29 Jan 2013 05:53:47 -0800 (PST) 
Hello,

I have a question about vectorizing a summation on Octave.

Suposse that I want to do this summation:

result = SUM(from i=1...MxN) SUM (from j=1...MxN) (Xi - Yi) * (Xj - Yj)

Where X, Y are MxN matrices.

Is there any way of doing that operation without for loops in Octave?
I can't find a way, but I am a beginner in Octave too.

Thanks for your time.



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