converting 3d matrix into a cell array

Question

AT_HYZ 2024-3-21

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回答： Dyuman Joshi 2024-3-22

Hi,

I have a 3D matrix (1001x 259x 259) and want to convert to a cell array (1x1001) in which each cell array has 259x259 matrix (2D matrix). Could anyone help?

Thanks.

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AT_HYZ 2024-3-22

在 MATLAB Online 中打开

I tried the below code from this forum

https://www.mathworks.com/matlabcentral/answers/344044-transform-a-3d-matrix-into-cell-array

Mycell = num2cell(Mymatrix,[2 3]);

But I want the 2D matrix inside each cell array.

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Answer 1

Dyuman Joshi 2024-3-22

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@AT_HYZ, change the dimensions and use the above transformation -

abc = rand(1001,259,259);
%Shift dimensions
Mymatrix = shiftdim(abc, 1);
%Check size
size(Mymatrix)
ans = 1x3
         259         259        1001
%Use num2cell
Mycell = num2cell(Mymatrix,[1 2]);
size(Mycell)
ans = 1x3
           1           1        1001
%Change the size of the cell array as required
Mycell = reshape(Mycell, 1, 1001);
%Check the size of data inside a cell element
size(Mycell{1})
ans = 1x2
   259   259

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Answer 2

James Tursa 2024-3-22

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https://ww2.mathworks.cn/matlabcentral/answers/2097556-converting-3d-matrix-into-a-cell-array#answer_1429291

编辑：James Tursa 2024-3-22

在 MATLAB Online 中打开

x = rand(1001,259,259);
result = arrayfun(@(k)squeeze(x(k,:,:)),1:size(x,1),'uni',false);
size(result)
ans = 1x2
           1        1001
size(result{1})
ans = 1x2
   259   259

But, be advised that for matrix manipulation it might be better to keep this data as a 3D array with dimensions 259x259x1001 (i.e., permute(x,[2 3 1])) so that you can take advantage of the page functions like pagemtimes, pagemldivide, etc.