Change dimension of matrices in a cell variable

Dear MATLAB community, I have made a cell whose dimension is a*b*c, which contains matrices of dimension d*1.

I want to change the dimension of matrices in such cell so that I get a cell variable whose dimension is a*d, which contains matrices of dimension c*b

Can I do such process using mat2cell, cell2mat, or any other function without using for loop or with only few for loops?

CHANGE (d*1) matrices in (a*b*c) cell

INTO (c*b) matrices in (a*d) cell

Answer 1

[Vedant Shah]

Hi @JINGYU KANG,

To convert an existing ‘a x b x c’ cell array containing ‘dx1’ matrices into an ’a x d’ cell array, you can follow these steps:

1. Loop over each value of ‘a’
2. For each iteration, convert the ‘b x c’ cell slice into a matrix using cell2mat.
3. Reshape the matrix into the desired ‘d’ size.
4. Convert it back into a ‘c x b’ cell array using mat2cell.
5. Append the result to the rows of the new cell array.

Below is a code snippet for your reference:

newCell = cell(a, d); 

for i = 1:a 
    matrices = cell2mat(reshape(originalCell(:, :), a, [])); 
    
    reshapedMatrices = reshape(matrices, d, []); 
    
    splitMatrices = mat2cell(reshapedMatrices, ones(1, d), c*b); 
    
    newCell(i, :) = cellfun(@(x) reshape(x, c, b), splitMatrices, 'UniformOutput', false); 
end 

For more information, you can refer to the documentation using the following commands in the MATLAB command window:

web(fullfile(docroot, "/matlab/ref/mat2cell.html")) 
web(fullfile(docroot, "/matlab/ref/cell2mat.html")) 
web(fullfile(docroot, "/matlab/ref/reshape.html"))