Merging text files according to time

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Shreenath Krishnamurthy
编辑： Astik Sachan 2019-8-9
Hi,
I am using the following code to merge data from several text files in the directory into a single file
files=dir('*.txt');
fileout='merged.txt';
fout=fopen(fileout,'w');
for cntfiles=1:length(files)
fin=fopen(files(cntfiles).name);
while ~feof(fin)
fprintf(fout,'%s %d\n',fgetl(fin),cntfiles);
end
fclose(fin);
end
fclose(fout);
How do i megre text files according to the time it was created. For instance i have 4 files in a directory and in the merged texted file the first data should be from the 1st file created, the second is the second file created and so on....

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回答（1 个）

Astik Sachan
Astik Sachan 2019-8-8
Hi Shreenath,
What you want is to sort the files (variable) on the basis of Time
Here is the code to do that
files = dir('*.txt')
files = struct2cell(files)
files = files' % to transpose the cell created
[S , I] = sort(files(:,3)); % make sure if '3' is your Time Field
files = files(I,:) % sorted variable files
Enjoy your day!
Thanks
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Shreenath Krishnamurthy
Shreenath Krishnamurthy 2019-8-8
Hi, I am having a couple of issues
  1. When i try Astiks code, in a directory containing 7000 files, the files are not sorted properly according to date if there are files from two months i.e 31 may and 1, 2june.
  2. I get files which contains the names of the files directory date created etc. How do i use this information now to write to a single text file. i.e how do i use 'files' in fopen to read all these files.
thanks for your help.
Astik Sachan
Astik Sachan 2019-8-9
编辑：Astik Sachan 2019-8-9
Try This then
files = dir('*.txt')
files = struct2table(files)
[S , I] = sort(files.datenum);
files = files(I,:)
This is based on Datenum that is a timestamp in Numeric Form.

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