Problem writing Summation code

2013 6 23
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Hi all,
I'm having problems writing a summation code for my thesis. The required summation is at http://i.imgur.com/yGMcc79.png
I've tried following the MATLAB help pages but am getting nowhere.
Thanks in advance,
James

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L = 1:10; % Assuming L
d = linspace(2,3,10); % Assuming d
n = sum(l .* (log10(d))) / (10 * sum((log10(d)).^2))
This is an approximate solution. I am assuming N = 10 and L and d are vectors.

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