How to Rewrite This Section of Code as a For Loop

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Cody Crouse 2024-3-14

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/2094606-how-to-rewrite-this-section-of-code-as-a-for-loop

评论： Steven Lord 2024-3-15

Do you know how a for loop equivalent for this would look like? I can't seem visualize what it would look like without having to make significant changes to the loop that I would have created: How can I compute the error without using the sum? I am not sure how to write it in terms of a loop. I am also not sure if I should use a for loop (given that the number of iterations will be the same as for the while loop) or if I should use the while loop:

This is the sevction of Code I want to convert to a for the purposes of a programming assignment that I have for engineering numerical methods:

function E=find_E(X_Prev, X_New);
termA = (X_New - X_Prev)^2;
termA = sum(termA(:))^0.5;
termB = X_New.^2;
termB = sum(termB(:))^0.5;
E = termA/termB;

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Answer 1

Steven Lord 2024-3-14

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https://ww2.mathworks.cn/matlabcentral/answers/2094606-how-to-rewrite-this-section-of-code-as-a-for-loop#answer_1425566

Conceptually, isn't taking the sum of an array of data just the same as repeatedly adding (+) each element to a running total? [The two implementations may not result in exactly, down-to-the-last-bit, identical answers in practice, but in theory shouldn't they match?]

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Cody Crouse 2024-3-15

在 MATLAB Online 中打开

In addition, I am looking to rewrite this text of code as a loop:

function E = find_E(X_Prev, X_New)
    termA = (X_New - X_Prev).^2;
    termA = sum(termA(:))^0.5;
    termB = X_New.^2;
    termB = sum(termB(:))^0.5;
    E = termA/te

Steven Lord 2024-3-15

Hint: take a look at the numel function.

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Answer 2

Walter Roberson 2024-3-15

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/2094606-how-to-rewrite-this-section-of-code-as-a-for-loop#answer_1425636

在 MATLAB Online 中打开

termAsum = 0;
for term = termA(:).'
    termAsum = termAsum + term;
end

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Cody Crouse 2024-3-15

Does this serve as a resplacement for my code section? I am asking because I already that E = find_E(X_Prev, X_New) several times in my code. In addition, my term statements are underneath it.