how to combine text files using load function?

i want to combine A,B,C files into one file.

But i faced error , Error using horzcat Dimensions of arrays being concatenated are not consistent.

this is my code

%put files to combine
File = {file_name_1, file_name_2,file_name_3};
A = [];
for index = 1 : numOfFile
 newA = load(File{index});
 A = [A newA];
end
% save final output
save('outputFile.txt', 'A')

[Kevin Chng]

I hope this help you

combinedata = [];
for K = 1 : 42
thisfilename = sprintf('file_name_%1d.txt', K);
thisdata = load(thisfilename); %load just this file
combinedata = [combinedata;thisdata]
end

%save final output
save('outputFile.txt','combinedata')

I modified the code from this link

https://www.mathworks.com/matlabcentral/answers/224348-how-can-i-read-all-text-files-in-a-folder-without-making-a-struct

[Walter Roberson]

Kevin Chng's solution puts the three files below each other, and presumes that the three files have the same number of columns.

The original code tries to put the three files beside each other, and presumes that the three files have the same number of rows.

If the three files must go beside each other but do not have the same number of rows, then you cannot create a numeric array from them unless you pad the shorter entries.

[Hyo Wan Park]

combinedata = [combinedata;thisdata];

this line happens same error.

[Kevin Chng]

Walter's Roberson mentioned that it might have error due to different number of columns.

Do you mind provide few of your files for me to try out?

Answer 1

[Walter Roberson]

The below code assumes the files are to be put side by side, and assumes that the number of rows in the files might be different. The number of columns in each file does not need to be the same at all. Shorter rows are padded with the value of your choice.

pad_value = nan;     %change to 0 if you want padding by 0

%put files to combine
File = {file_name_1, file_name_2,file_name_3};

for index = 1 : numOfFile
  newA = load(File{index});
  if ndims(newA) > 2
     error('File "%s" has more than 2 dimensions', File{index});
  end
  if index == 1
     A = newA;
  else
    [or, oc] = size(A);
    [nr, nc] = size(newA);
    if nr > or                       %new file has more rows than any previous file
      A(or+1:nr, :) = pad_value;
      or = nr;
    end
    if nr < or                       %new file has fewer rows than some previous file
      newA(nr+1:or, :) = pad_value;
      nr = or;
    end
    A(:, end+1:end+nc) = newA;
  end
end

% save final output
save('outputFile.txt', 'A', '-ascii', '-double')

The logic would be much the same for the case of putting the files under each other but not assuming that the number of columns are the same.

Answer 2

[Raghunandan V]

Since you are trying to do in arrays you are not able to concancate You should try it using cell arrays. something like this

fileName={'new1.txt', 'new2.txt', 'new3.txt'};

%open file identifier

fid=fopen('MyFile.txt','w')

for k=1:length(fileName)

    %read the file name as string including delimiters and next lines

    List=textread(fileName{1,k},'%s','delimiter','\n');

    %arrange them in order of k if you want in a cell array

    FinalList{k,1}=List;

    %or print them into a file.

    fprintf(fid, [cell2mat(List)  '\n']);

end

%close file indentifier

fclose(fid)