Check the flipped of 3D Array matrix

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Trang Hu Jia
Trang Hu Jia 2022-2-16
评论： Trang Hu Jia 2022-2-17
Hello everyone,
I'm construct the multi dimensions 3D [X,Y,Z double] matrix.
Suppose I have
A = zeros(3,6,3);
A(:,:,1) = [1 2 3 3 2 1
2 2 3 3 2 2
3 3 4 4 3 3];
A(:,:,2) = [1 1 3 3 1 1
0 0 3 3 0 0
5 5 6 6 5 5];
A(:,:,3) = [0 0 3 3 0 0
1 1 3 3 1 1
5 5 1 1 5 5];
As we can see, along through Z-axis ( the center in column 1 to column 3 can be flipped as column 4 to 6
Do we have any way to check and return as logical value (0,1) to show this multidimension arrays are fliped or not.
Thanks in advances.
  2 个评论
Benjamin Thompson
Benjamin Thompson 2022-2-16
Can you define what "flipped" means? You can review the contents of your matrix in MATLAB after creating it.
Trang Hu Jia
Trang Hu Jia 2022-2-16
Dear @Benjamin Thompson
Thek you very much for replying this topic.
The "flipped" that I mean is in page 1 to 3 (in Z-axis)
Column 3 are exactly the same in column 4, Column 2 are exactly the same in column 5 and so on.
This matrix I can directly check it easily.
However, suppose I have larger matrix in X rows and Y columns, do we have any way to check it by logical ?
Thanks in advances.

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采纳的回答

Jan
Jan 2022-2-16
编辑：Jan 2022-2-16
Do you mean:
isequal(A, flip(A, 2))
If A is huge (e.g. 1 GB), this operation is not efficient, because it duplicates the Array. If this is the bottleneck of you code, you could to the comparison in a C-mex function. This will be a little bit slower for small A (I estimate until 1000 elements), but much faster if e.g. the first element does not match already and the function can reply FALSE soon.
Do you need such a C-mex function?

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