Merge specific text files - matlab

Question

I have a problem in my code. I am using some loops in order to create mulptile .txt files with specific names, eg mR1.txt, mR2.txt,...mR100.txt. After that I merge them into one file with the following commands:
name=regexp(fileread('names.txt'), '\r?\n', 'split') .';
file1=regexp(fileread('data.txt'), '\r?\n', 'split') .';
.....
for n=1:numel(name);
for z=1:size(file1)
........ %making caluclations
FP=fopen(sprintf('mR%g0.txt',z),'wt');
fprintf(FP,'%s\t',file1{z},num2str(number),num2str(number);
fclose(FP);
txtFiles = dir('mR*.txt') ; % get the text files in the present folder
N = length(txtFiles) ; % Total number of text files
iwant = cell(N,1) ; % initlaize the data required
% loop for each file
for i = 1:N
thisFile = txtFiles(i).name ;
iwant{i} = importdata(thisFile) ; % read data of the text file
end
iwant = cell2mat(iwant) ;
outFile = strcat('finalR',num2str(n),'.txt') ;
dlmwrite(outFile,iwant,'delimiter','\t')
end
end
I would like to create for each iteration M1_mR1.txt,...,M1_mr100.txt, and M1_mR1.txt,..., M2_mR100.txt. After that I would like to merge all the files that Have prefix M1_.....txt into one file and all the files that Have prefix M2_.....txt into one file.
How could I do this?

Answer 1

This can be done in multiple ways.
Note about sorting: The default sorting in files will give higher value to file2 than file100, so you need to sort by actual number value. This is done by converting the filename numbers to first code and second code, and then sort by the second code with sortrows.
So this will solve the problem:
clear
textfiles_dir=dir('M*_mR*.txt');
textfiles_name={textfiles_dir.name}; %group the filenames into cell array
textfiles_codes=cellfun(#(fname)textscan(fname,'M%d_mR%d.txt'),textfiles_name,'Uniform',false);
textfiles_codes=cell2mat(cat(1,textfiles_codes{:})); %separate bw first and second code
disp(textfiles_codes)
[sorted_codes,orig_idx]=sortrows(textfiles_codes,2); %sort by second code
first_codes=sorted_codes(:,1);
second_codes=sorted_codes(:,2);
unique_firstcodes=unique(first_codes);
for ifirstcode=1:length(unique_firstcodes)
firstcode=unique_firstcodes(ifirstcode);
fprintf('firstcode=%d: ',firstcode)
target_name=sprintf('Merged%d.txt',firstcode);
f_target=fopen(target_name,'w');
idxs=orig_idx(first_codes==firstcode); % already sorted in increasing order
for i=1:length(idxs)
idx=idxs(i);
fname=textfiles_name{idx};
fprintf(' %s ',fname)
f_src=fopen(fname,'r');
src_text=fread(f_src,'*char')';
fclose(f_src);
fwrite( f_target,src_text);
end
fclose(f_target);
fprintf('\n')
end
fprintf('Done!\n')