What do these lines of code mean

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Camden Nelson
Camden Nelson 2023-2-11
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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回答（2 个）

Walter Roberson
Walter Roberson 2023-2-11
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.
Voss
Voss 2023-2-11
Ran in:
"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
  2 个评论
Camden Nelson
Camden Nelson 2023-2-11
Okay gotcha. That makes a lot more sense seeing it step by step. Thanks!
Steven Lord
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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