Doubt about finding the nearest values between array and a matrix

2022 1 25
2 个回答
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更新时间：2022 1 26
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0 个投票

Hi, everybody
I'm trying to find the nearest values from a array inside a matrix. Example:
Array = [12, 16, 300, 200, 250, 380, 145, 6, 8, 10, 12, 100, 16, 440]; %array with 14 elements
Matrix = [15, 20, 310; 1000, 500, 1; 146, 10, 11; 5, 23, 800; 600, 100, 50]; %matrix 5x3
but when a try:
for i=1:size(Array,2)
[~,ID] = min(abs(Matrix - Array(i)),[],1);
end
The ID have just 3 elements, not 14. I don't understand why. Anybody could explain to me. please.
Att,
Paulo

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 采纳的回答

Torsten
Torsten 2022-1-25

1 个投票

for i=1:size(Array,2)
[r{i},c{i}] = find(abs(Matrix-Array(i))==min(abs(Matrix(:)-Array(i))));
end

更多回答（1 个）

Jon
Jon 2022-1-25

1 个投票

You are overwriting the value of ID with each pass through your loop, so you only see the value for the last pass.
If you want the value for every pass then you need to assign ID(i) in the loop

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Jon
Jon 2022-1-25
编辑：Jon 2022-1-25
Also, I'm not really clear on what you are looking for here. Do you want to know for each element of Array the value in Matrix (doesn't matter the row or column) which is the closest?
So for example for Array(1) = 12, what is the answer you are hoping to find?
DGM
DGM 2022-1-25
I'm just going to add that clearing up this confusion would be helped greatly by using meaningful variable names. Calling an array "Array" is about as fruitful as naming your kids "Hey You".
Paulo Cunha
Paulo Cunha 2022-1-25
编辑：Paulo Cunha 2022-1-26
@Jon I need to know the positions of the nearest values from the Array inside the Matrix. Because in my original matrix, that I'm using in my project and it has 5548 elements, has several elements with the same value, and I need to know the positions of all of them.
For Array(1) = 12, I'm waiting for (3,3). The position of 11.
Paulo Cunha
Paulo Cunha 2022-1-25
@DGM I gave those names, because the names I use in my original project could turn the problem too complex. My mother language is portuguese, and I use it to create the variables, and the project has almost 1000 lines.
Paulo Cunha
Paulo Cunha 2022-1-26
@Jon thank you for the clarification! You helped me to solve the problem with your main answer. Thank you!!

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