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

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Sarah Bassiouny
Sarah Bassiouny 2022-11-26
评论： Jan 2022-11-27
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.
Thank you in advance

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Jan
Jan 2022-11-26
编辑：Jan 2022-11-26
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
  2 个评论
Sarah Bassiouny
Sarah Bassiouny 2022-11-26
okay perfect, i got the results of the smallest value, now i need to know the position of that value and display it in the form of an array, so if the smallest value is in position 4 then the value in the results matrix is the difference, and the array is 6.
Thank you in advance
Jan
Jan 2022-11-27
[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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