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I'm working in a matlab script that open a group of text files and read their content. The content is XY double points, separated by " ". I save the readed values in a Array like this:

 dataArray= textscan(fileID, formatSpec, 'Delimiter', delimiter, 'MultipleDelimsAsOne', true, 'EmptyValue' ,NaN, 'ReturnOnError', false); 

This work fine but problems appear when i open multiple files because put the data in a array od data. Here the code and example:

for i = 1:length(files) 
 %% Open the text file.
 fileID = fopen([path filesi],'r');
 dataArray = cat(1, dataArray, textscan(fileID, formatSpec, 'Delimiter', delimiter, 'MultipleDelimsAsOne', true, 'EmptyValue' ,NaN, 'ReturnOnError', false));
 end

 %% Close the text file.
 fclose(fileID);
end

The result of this is:

Where each cell is

I want that all values appear continuous like in the second picture. What i'm doing wrong?

Cat should work, but for your example [dataArray; textscan(...)] looks even more convenient to me. Check first, whether what you load via textscan really has the format that you expect.

Please note that at your example image you have different data types. Column 1 and 2 are of type double and 3 is of type cell. To concentrate all in one variable it is necessary that everything is of type double. Check your formatSpec variable.

Also, your example code is not working because of an additional end.