how to write a script that outerjoins multiple data files
1 view (last 30 days)
Show older comments
I have files "File1.csv", "File2.csv",.... and "File33.csv". Each of 33 files has a key variable 'date'. I would need to outerjoin these 33 files using 'date' as the key variable. I understand it is a generalization of
B=outerjoin(File1,File2,'Keys', 'date', 'MergeKeys', true)
But I need to understand
(1) how to write a loop to read 33 files from C:\Dropbox (say)
(2) how to write a loop to outerjoin 33 files
(3) how to write a script to save the output file into C:\Dropbox
I will appreciate a code sample.
Thank you.
0 Comments
Accepted Answer
Guillaume
on 10 Apr 2019
Something like (untested, expect typos):
folder = 'C:\dropbox';
filelist = dir(fullfile(folder, 'File*.csv'));
for fileidx = 1:numel(filelist)
filecontent = readtable(fullfile(folder, filelist(fileidx).Name));
if fileidx == 1
joined = filecontent;
else
joined = outerjoin(joined, filecontent, 'Keys', 'Date', 'MergeKeys', true)
end
end
writetable(joined, fullfile(folder, 'joined.csv'));
3 Comments
Guillaume
on 10 Apr 2019
Well, I did warn that typos were likely. You're allowed to try to figure out what the code does and fix the typos yourself.
Replace Name by name.
More Answers (0)
See Also
Categories
Find more on Time Series Objects in Help Center and File Exchange
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!