Converting a 3D Matrix to multiple 2D matrices

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Aldo Hernandez 2021-1-17

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https://ww2.mathworks.cn/matlabcentral/answers/719105-converting-a-3d-matrix-to-multiple-2d-matrices

编辑： Bruno Luong 2021-1-17

I have a 3D matrix, 1000 x 1000 x 40

I want to convert this matrix to 40 different matrices, 1000 x 1000 each. I suppose I am asking for the inverse of repmat, however searches into that have not led to progress.

Any help is appreciated.

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Athrey Ranjith Krishnanunni 2021-1-17

编辑：Athrey Ranjith Krishnanunni 2021-1-17

Something like this?

largeMatrix = randn(1000,1000,40);
smallMatrixArray = cell(40,1);
for iOuterDim = 1:40
    smallMatrixArray{iOuterDim} = largeMatrix(:,:,iOuterDim);
end

Steven Lord 2021-1-17

I want to convert this matrix to 40 different matrices

Why? What benefit do you hope to gain by doing that instead of indexing into the array to retrieve the appropriate slice when needed?

A = reshape(1:(3*4*5), [3 4 5]);
A4 = A(:, :, 4)
A4 = 3×4
    37    40    43    46
    38    41    44    47
    39    42    45    48

What happens when or if you expand your problem sizes to an array of size 10000 in the third dimension? Your workspace would become awfully cluttered with ten thousand and one arrays in it.

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