# How to concatenate lines in cell arrays

7 vues (au cours des 30 derniers jours)
Hugo le 15 Mar 2022
Modifié(e) : Stephen23 le 8 Avr 2022
Hi,
I have a Cell array, name DATA with 5*50 cells. Each cell has a 1000*30 matrix
I would like to obtain a new matrix that contains the concatenation of the column 1 and all lines (:,1), for all the 50 columns. I need all the lines of all cells in all columns to show up as a resulting matrix, named MR, of dimensions 40000*50.
Right now I have the following code:
for j=1:1:50
MR(:,j)=cat(1,DATA{1,j}(:,1),DATA{2,j}(:,1),DATA{3,j}(:,1),DATA{4,j}(:,1),DATA{5,j}
end
However, the code write all the columns with the same values, so definitely there is something wrong with it. Any help is appreciated.
Best regards,
##### 3 commentairesAfficher 1 commentaire plus ancienMasquer 1 commentaire plus ancien
Hugo le 15 Mar 2022
Dear Jan,
I am sorry. I apologize for my mistake. Each cell of the array DATA has dimensions 1000*1
Jan le 16 Mar 2022
So you have a {5 x 50} cell array containing [1000 x 1] vectors. Then I still do not understand, how you can obtain a [40000 x 50] matrix.

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### Réponse acceptée

Voss le 15 Mar 2022
% 5-by-50 cell array, each cell containing a 1000-by-1 column vector:
DATA = repmat({(1:1000).'},5,50);
% combine all cells into a 5000-by-50 matrix:
DATA_MAT = cell2mat(DATA);
##### 3 commentairesAfficher 1 commentaire plus ancienMasquer 1 commentaire plus ancien
Stephen23 le 15 Mar 2022
Modifié(e) : Stephen23 le 8 Avr 2022
Of course, you use your DATA array.
_ just made up some data so that they could run their code on something. Code does not run on air.
Use your DATA. Not the fake DATA that _ kindly used to demonstrate their code with.
Voss le 15 Mar 2022
@Hugo: As @Stephen points out, I made up values for DATA just for demonstration purposes. In fact you may only need to run the second line of my answer (with your DATA variable), in order to do what you want:
DATA_MAT = cell2mat(DATA);

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