Summing elements in an array

[dirac]

Hi,

I am wanting to sum the first 1000 elements in a matrix I have defined.
Initially I want to perform it on one column, but then move to performing
the calculation over all 20 columns. Is there a way to do this as I am
having great difficulty using for loops for this.

Another question is if three nested for loops for analyzing a 210000 element
array is going to be slow...

Thanks in advance.

Martin

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Converting myself from Excel to Octave for reasons I hope to find out.
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