Bellasmith asked . 2020-07-29

How to make a matrix from the cells inside the cell?

Hi! I have a cell variable, the size is 4 by 3. The third column of the variable contains cells again. I want to extract the numbers that I have inside every cell of the third column and make a usual double variable. How can I do this?

Example: A = 4x3 cell.

1 1 1x1 cell

1 2 2x1 cell

1 3 5x1 cell

1 4 3x1 cell.

Every cell of the third column has cells with only one number inside. I want to get these numbers out. So in the end I want to have a matrix of 1+2+5+3 rows from the A cell. Is it possible to do it?

matrix , matlab

Expert Answer

Neeta Dsouza answered . 2024-12-21 17:05:33

Z = A(:,3);
 Wanted = cell2mat(cat(1, Z{:}))

A cell array is a data type with indexed data containers called cells, where each cell can contain any type of data. Cell arrays commonly contain either lists of text, combinations of text and numbers, or numeric arrays of different sizes. Refer to sets of cells by enclosing indices in smooth parentheses, (). Access the contents of cells by indexing with curly braces, {}.

Creation

When you have data to put into a cell array, create the array using the cell array construction operator, {}.

C = {1,2,3;
     'text',rand(5,10,2),{11; 22; 33}}

C=2×3 cell array
    {[   1]}    {[          2]}    {[     3]}
    {'text'}    {5x10x2 double}    {3x1 cell}

You also can use {} to create an empty 0-by-0 cell array.

C = {}

C =

  0x0 empty cell array

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