How to count the number of elements of several arrays inside an array?

Not sure if there is an easy function for this. I have a 3x3 cell array, and inside each of those cells are arrays of various sizes. I want to calculate the length for each of these and store it, am trying to write a loop for this but not sure how to get it to read all the arrays vertically AND horizontally. Any suggestions?

18x5 cell   25x5 cell   46x5 cell
63x5 cell   77x5 cell  27x5 cell
34x5 cell   90x5 cell  19x5 cell

ie) the output would be {18, 25, 46; 63, 77, 27; 34, 90, 19}

Answer 1

[OCDER]

T = [18 63 34 25 77 90 46 27 19];
C = cell(3);
for k = 1:length(T)
    C{k} = cell(T(k), 5);
end

D = cellfun('size', C, 1); 
D =
  18    25    46
  63    77    27
  34    90    19

[Jasmine Karim]

I'm not able to get this to work for my particular data - what if the data aren't already defined for T? The values in the cells will change with each iteration.

[OCDER]

Can you elaborate?

D = cellfun('size', C, 1);
                    ^ this is your cell array storing matrix of difference sizes

This should work for C, as long as C is a cell array storing matrices, even if the size of the matrix per element in C changes per iteration. In the example I gave above, "T" is just there to recreate your data for testing purpose only. Your code should not even need "T".

[Jasmine Karim]

I think that's the problem, C is not holding the matrices. I used (size(iFI)) because this is part of a bigger loop and the length of iFI will keep changing.

            C = cell(size(iFI));
            for k = 1:length(iFI)
                C{k} = cell(iFI(k), 7);
            end
            D = cellfun('size', C, 1);

But I get this error: Error using cell Conversion to double from cell is not possible.

And C is still full of []

[OCDER]

iFI = num2cell(randi(5, 5)); %Is this a cell?

C = cell(size(iFI));
for k = 1:length(iFI)
    C{k} = cell(iFI(k), 7);  
    %Can't use a cell as a index. 
    %cell(iFI(k), 7) == cell({#}, 7) => 
    %ERROR: Conversion to double from cell is not possible.

      %To fix, you need to get the integer value instead.
      C{k} = cell(iFI{k}, 7); %use curly brackets {}, not parentheses ()
  end
  D = cellfun('size', C, 1);