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

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Jasmine Karim 2018-8-28

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评论： OCDER 2018-8-30

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}

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Answer 1

OCDER 2018-8-28

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https://ww2.mathworks.cn/matlabcentral/answers/416598-how-to-count-the-number-of-elements-of-several-arrays-inside-an-array#answer_334464

编辑：OCDER 2018-8-28

在 MATLAB Online 中打开

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

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Jasmine Karim 2018-8-30

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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 2018-8-30

在 MATLAB Online 中打开

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);