# Subtracting a value in a 3D array with all values in another 3D array

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Sarah Bassiouny 2022년 11월 26일
댓글: Jan 2022년 11월 27일
Hello, I have 2 three-dimensional arrays, i would like to take the first value in the first array and subtract it with all values in the second array, and then the second value in the first array with all values in the second array, and in each time the smallest value of the subtraction is put in a new array.
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Sarah Bassiouny 2022년 11월 26일
min(abs(x-y))

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### 채택된 답변

Jan 2022년 11월 26일
편집: Jan 2022년 11월 26일
A = rand(5,6,7);
B = rand(6,7,8);
D = min(A(:).' - B(:), [], 1);
Result = reshape(D, size(A));
If the intermediate matrix A(:).'-B(:) exhausts the available RAM, use a loop:
Result = zeros(size(A));
for k = 1:numel(A)
Result(k) = min(A(k) - B, [], 'all');
end
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Jan 2022년 11월 27일
[D, Pos] = min(A(:).' - B(:), [], 1);
determines the position also as linear index. But what do you exactly need as output "position" for 3D arrays?
I do not understand, what this means: "if the smallest value is in position 4 then the value in the results matrix is the difference, and the array is 6." Why 6?

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