How to concatenate elements in cell array to a vector?

Question

NHJ 2022-8-3

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1772960-how-to-concatenate-elements-in-cell-array-to-a-vector

评论： NHJ 2022-8-3

I have cell arrays with different size & I want to concatenate all the elements in the cell to become a vector. How to do that?

This is my code:

% Create cell arrays
Q= [23 34; 44 55; 56 71; 63 49; 71 30];
B= [12 13; 10 99];
C{1}=Q;
C{2}=B;
% Convert cells to vector
nCol   = cellfun('size', C, 1); 
nRow   = numel(C); 
No_of_elements = cellfun(@numel, C); 
P = No_of_elements(1,1) + No_of_elements(1,2); 
Output = NaN(1,P); % Size vector
for iC = 1:numel(C)
  idx = (iC - 1) + 1;
  Output(1:P(iC), idx:idx+1) = C{iC};
end

I want the final output to become, Output = [23 34 44 55 56 71 63 49 71 30 12 13 10 99]

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Answer 1

Paul 2022-8-3

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https://ww2.mathworks.cn/matlabcentral/answers/1772960-how-to-concatenate-elements-in-cell-array-to-a-vector#answer_1020110

在 MATLAB Online 中打开

Q= [23 34; 44 55; 56 71; 63 49; 71 30];
B= [12 13; 10 99];
C{1}=Q;
C{2}=B;
Output = reshape(vertcat(C{:}).',1,[])
Output = 1×14
    23    34    44    55    56    71    63    49    71    30    12    13    10    99

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Paul 2022-8-3

编辑：Paul 2022-8-3

在 MATLAB Online 中打开

Q and B are not cell arrays. If you have them by themselves then

Q = [23 34 10; 44 55 45; 56 71 32; 63 49 55; 71 30 11];
B = [12 13; 10 99];
output = horzcat(reshape(Q.',1,[]),reshape(B.',1,[]))
output = 1×19
    23    34    10    44    55    45    56    71    32    63    49    55    71    30    11    12    13    10    99

If they really are elements of a cell array

C{1} = Q;
C{2} = B;
output = horzcat(reshape(C{1}.',1,[]),reshape(C{2}.',1,[]))
output = 1×19
    23    34    10    44    55    45    56    71    32    63    49    55    71    30    11    12    13    10    99

Probably other solutions as well.

NHJ 2022-8-3