# 2D summation loop

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John Allen il 22 Ago 2019
Commentato: James Tursa il 23 Ago 2019
How do I create this in MATLAB?
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James Tursa il 22 Ago 2019
What have you done so far? What specific problems are you having with your code? Do you know how to write a for-loop, or use the sum( ) function, or use the diff( ) function, or use the .* operator?
John Allen il 22 Ago 2019
Yes, I know all of those, just never did it like this, so totally confused how to structure this one.

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### Risposta accettata

James Tursa il 23 Ago 2019
Modificato: James Tursa il 23 Ago 2019
Take the denominator for instance. Literally written out, this would be
denominator = 0;
for k=1:K
denominator = denominator + B(k,j)^2;
end
Or, assuming the first dimension of B is K, then you could use the sum( ) function:
denominator = sum(B(:,j).^2);
You can construct similar code for the numerator.
Probably best if you code everything up using for-loops just to get something running that works. Then you can simplify things with the sum( ) and diff( ) functions. It is possible to do the entire operation to construct ds without loops.
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John Allen il 23 Ago 2019
OK, thank you very much, I think I get it now, I marked answer as accepted.
Thanks again! :)
James Tursa il 23 Ago 2019
If you have trouble, don't hesitate to post your current code and the problems you are having and we can still help you.

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