Export 2 Dimension out of a 3 dimensionoal Array

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Mouse
Mouse 2021-11-8
评论： Star Strider 2021-11-8
Hi
I hava a 3D Array. Now I like to save the content of the 3d array in n 2d arrays
2dArray = zeros(size(3dArray([1],:,:)));
for z = 1: size(3dArray(:)
2dArray(z)=3dArray(z,:,:)
end
What am I doing wrong?

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回答（1 个）

Star Strider
Star Strider 2021-11-8
Ran in:
I am not certain what is the desired result.
Usually, the intent is to separate the ‘pages’ (third dimension) of the array into separate 2D arrays.
Likely the best option for that is —
Array3D = randi(9, 3, 4, 4);
Array3D(:,:,2) % Display Page (Dleete Later)
ans = 3×4
2 8 7 2 8 2 6 4 1 9 3 6
A3dsz = size(Array3D)
A3dsz = 1×3
3 4 4
Arrays2D = mat2cell(Array3D, A3dsz(1), A3dsz(2), ones(1,A3dsz(3)));
Arrays2D{2} % Display Result
ans = 3×4
2 8 7 2 8 2 6 4 1 9 3 6
Make appropriate changes to get the desired result.
.
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Mouse
Mouse 2021-11-8
data3D=rand(3,3883,280); %create a 3D array
for i = 1: 3 %now separate every page of the 3D array into 2D arrays
oneDataSet = data3D(i,:,:); %cut away a page "slide"
data_2D=squeeze(oneDataSet);%put away the information that this is a page. Only Information about 2D Array will stay
end
this is my solution to convert a 3 Dimensional Array
Star Strider
Star Strider 2021-11-8
Ran in:
The code in Comment overwrites ‘data_2D’ in every loop iteration. Only one (the last) 2D matrix created will result.
My code produces 3 separate matrices as cell arrays.
A small addition to it will squeeze all of them as well —
Array3D = randi(9, 3, 5, 4);
Array3D(2,:,:); % Display Page (Delete Later)
squeeze(Array3D(2,:,:)) % Display Page (Delete Later)
ans = 5×4
6 9 2 9 7 8 5 8 8 1 8 7 5 7 1 8 6 1 7 6
A3dsz = size(Array3D);
Arrays2D = mat2cell(Array3D, ones(1,A3dsz(1)), A3dsz(2), A3dsz(3));
Arrays2D{2}; % Display Result
Arrays2D = cellfun(@squeeze, Arrays2D, 'Unif',0); % Display Result
Arrays2D{2}
ans = 5×4
6 9 2 9 7 8 5 8 8 1 8 7 5 7 1 8 6 1 7 6
.

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