# 1X1500 cell array to matrix

3 views (last 30 days)
Arup Bhattacharya on 24 Jan 2019
Commented: Adam Danz on 25 Jan 2019
I have 1500 .txt files containing 5 columns and 71022 rows. I converted them into 1x1500 cell array using import tool. Now the new table data has 1500 tables, each having 5 columns and 71022 rows. I want to have a 3-D matrix. How do I do that?

Adam Danz on 24 Jan 2019
Since each matrix is the same size, here's an easy solution: If your cell array is named 'ca', 'm' will be your 3D array.
m = reshape(cell2mat(ca), 71022, 5, 1500);
How this works:
cell2mat() converts your 1x1500 cell into a 71022x(1500*5) matrix.
reshape() converts that matrix into a 3D array with 71022 rows, 5 columns, and 1500 pages.
Adam Danz on 25 Jan 2019
My solution works when your variable is a cell array and each element of the cell array is a matrix. I'll need to look at your variable to help further. You could save your variable to a mat file and upload it here.

Bob Thompson on 24 Jan 2019
You can try using cell2mat(), but I'm not intimately familiar with it enough to know if it will work with arrays inside each cell, or if you need to just have doubles.
Alternatively, you can always just use a loop:
for i = 1:size(cellarray,2)
3dmatrix(:,:,i) = cellarray{i};
end

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