how to write a script that outerjoins multiple data files
1 回表示 (過去 30 日間)
古いコメントを表示
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 件のコメント
採用された回答
Guillaume
2019 年 4 月 10 日
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 件のコメント
Guillaume
2019 年 4 月 10 日
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.
その他の回答 (0 件)
参考
カテゴリ
Help Center および File Exchange で Time Series Objects についてさらに検索
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!