MATLAB: Merging files using for loop

merge text file

I am trying to merge 7 text files into 1 using system ('copy 090615.txt+090616.txt+090617.txt+090618.txt+090619.txt+090619.txt+090620.txt+090621.txt New.txt'); How can I do the same thing using a for loop. Thanks

Best Answer

The above method should work.

However, instead of copying the content into a string ( which might be HUGE for several files ), try using the flag 'a' (append) instead of 'w' (write, will start at the beginning of the file again) when opening the file, i.e.

   fid = fopen(newFile, 'a');

This way, you can read the files one at a time, and write the content to a single file.

PS: If the file is not empty in the beginning, but you don't want to keep the old content, you need to open it with "w" for k == 1, and then use "a".

Related Solutions

MATLAB: How to change a specific part in a specific line in a text file

contents = fileread('test.txt');
newa = 10;
newb = 123;
newcontents = regexprep(contents, {'^a\S*=\S*\d+', '^b\S*=\S*\d+'}, {sprintf('a = %d', newa), sprintf('b = %d', newb)});
fid = fopen('test_new.txt', 'wt');
fwrite(fid, newcontents);
fclose(fid);

MATLAB: How to extract specific rows from a text file

Hello,

Here is an solution that you can refer,

clear
FileName = 'HP1_ordered.txt';
NewFile = 'HP1_ordered_skip10.txt';
fp = fopen(FileName);
Str   = textscan(fp,'%s','delimiter',sprintf('\f'));
fclose(fp);
cStr = char(Str{1}(1:10:end)); % you can change number of row 
                                % that you want to skip at this line. 
fid = fopen(NewFile, 'w');
if fid == -1
  error('Cannot create new file: %s', NewFile);
end
for i = 1:size(cStr,1)
fprintf(fid, '%s\n', cStr(i,:));
end
fclose(fid);

In this code, it is supposed that you have "FileName" and want to write its containts into "NewFile". Also, you want to skip 10 rows of the "FileName".

Hope it could help.

Best Answer

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MATLAB: How to change a specific part in a specific line in a text file

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