How to merge .txt files from a loop using writematrix

Hello,

I have a problem with a code. I am making via aloop multiple .txt files. I would like to merge them to a final.txt file, via a for loop but I do not know how.

I am importing my code

for n=1:numel(st);
for i=1:size(nam);
    FP=fopen(sprintf('m%g0.txt',i),'wt');
    fprintf(FP,'%s\t',num2str(Results));  
    fclose(FP);
    
    D = 'absolute/relative path to where the files are saved';
    N = 25; % number of files
    C = cell(1,N);
    for k = 1:N
        F = fullfile(D,sprintf('m%u.txt',k));
        C{k} = dlmread(F);
    end
    M = vertcat(C{:});
FF = sprintf('final%u.txt',n);
dlmwrite(FF,M,'\t')

end
end

I have tried dlmwrite but it does not work.

command window shows me error:

Error using dlmread (line 62) The file 'C:\Users\HP\Desktop\P\m2.txt' could not be opened because: No such file or directory

Error in F (line 105) C{k} = dlmread(F);

Could you help me?

Answer 1

[Ronit]

Hello Ivan,

The error message suggests that the file m2.txt does not exist at the specified path. This could be due to a mismatch in the file naming or path issues. Please look at the following approach:

D = 'absolute/relative path to where the files are saved';
N = 25;

for n = 1:numel(st)
    for i = 1:size(nam)
        filename = fullfile(D, sprintf('m%u.txt', i)); % Correct file naming
        FP = fopen(filename, 'wt');
        fprintf(FP, '%s\t', num2str(Results));  
        fclose(FP);
    end
    
    C = cell(1, N);
    for k = 1:N
        F = fullfile(D, sprintf('m%u.txt', k)); % Correct file naming
        if exist(F, 'file')
            C{k} = readmatrix(F, 'Delimiter', '\t');
        else
            warning('File %s does not exist.', F);
        end
    end
    
    M = vertcat(C{:});
    FF = fullfile(D, sprintf('final%u.txt', n));
    writematrix(M, FF, 'Delimiter', '\t');
end

Please try to use "readmatrix" instead of "dlmread" as it is not recommended anymore. Following are the MATLAB’s documentation links for further information:

1. "readmatrix" - https://www.mathworks.com/help/matlab/ref/readmatrix.html
2. "dlmread" - https://www.mathworks.com/help/matlab/ref/dlmread.html
3. "writematrix" - https://www.mathworks.com/help/matlab/ref/writematrix.html

I hope it resolves your query!