2D summation loop

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John Allen 2019-8-22

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https://ww2.mathworks.cn/matlabcentral/answers/477259-2d-summation-loop

评论： James Tursa 2019-8-23

采纳的回答： James Tursa

How do I create this in MATLAB?

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James Tursa 2019-8-22

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 2019-8-22

Yes, I know all of those, just never did it like this, so totally confused how to structure this one.

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James Tursa 2019-8-23

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编辑：James Tursa 2019-8-23

在 MATLAB Online 中打开

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.