What do these lines of code mean

Question

Camden Nelson 2023-2-11

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1910635-what-do-these-lines-of-code-mean

评论： Steven Lord 2023-2-11

I am working on a homework assignment where I have to code a linear search algorithm, and looked up a video to see other solutions. I am confused what the code on lines 2 and 6 mean practically. Is it first initializing an empty array than storing the found user value into that array?

See code below:

1) x = input('Enter the array:');

2) Y = [];

3) y = input('Enter the number you want to seach:');

4) for i=1:length(x)

5) if (x(i)==y)

6) Y = [Y i];

7) end

8) end

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Answer 1

Walter Roberson 2023-2-11

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https://ww2.mathworks.cn/matlabcentral/answers/1910635-what-do-these-lines-of-code-mean#answer_1168945

Yes. That code starts with an empty output, and then each time it finds a match, it appends the index of the match at the end of the list.

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Camden Nelson 2023-2-11

Ah I see. Thank you!

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Answer 2

Voss 2023-2-11

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1910635-what-do-these-lines-of-code-mean#answer_1168950

在 MATLAB Online 中打开

"Is it first initializing an empty array"

Yes.

"[then] storing the found user value into that array?"

Storing the index (i) at which the user's value was found. Specifically, line 6 is storing all the indices at which the user's value was found, and doing so by concatenating them one-by-one with the array Y, and storing the result as the new Y each time.

Consider the following code. Each time, Y = [Y i]; appends a new value to the end of Y by concatenating the existing Y with the new value i.

Y = [];
i = 2;
Y = [Y i]
Y = 2
i = 5;
Y = [Y i]
Y = 1×2
     2     5
i = 10;
Y = [Y i]
Y = 1×3
     2     5    10

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Camden Nelson 2023-2-11

Okay gotcha. That makes a lot more sense seeing it step by step. Thanks!

Steven Lord 2023-2-11

FYI for future reference, you can step through code line by line using the debugging tools if that helps you more easily understand what the code is doing.

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