combine multiple text files into one text file with a loop

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Aaron Farkas
Aaron Farkas 2012-5-30
评论： Walter Roberson 2019-2-23
Hi
I have multiple text files with names like 1.txt, 2.txt, 3.txt...... Each file has a single row of data(same format and length), I am think about combining those files into one text file which has a matrix data.
For example
1.txt has a row of " 1 3 4 8...."
2.txt has a row of " 3 5 7 3...."
3.txt has a row of " 9 1 3 5...."
......
I want to combine them into a file with a matrix like below,
1 3 4 8....
3 5 7 3....
9 1 3 5....
I know I can do system('copy 1.txt+2.txt+3.txt MyBigFat.txt'), but if I have over 100 or even 1000 text files can I save myself the trouble from doing system('copy 1.txt +2.txt+ 3.txt +...+1000.txt')?
Thanks in advance!
  1 个评论
Walter Roberson
Walter Roberson 2019-2-23
You can generate the command to system()
s = sprintf('%d.txt+', 1:999);
s = ['copy ', s, '+1000.txt MyBigFat.txt'];
system(s)

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回答（2 个）

Andrei Bobrov
Andrei Bobrov 2012-5-30
k = arrayfun(@(x)dlmread([num2str(x),'.txt']),1:3,'un',0)
out = cat(1,k{:})
dlmwrite('4.txt',out,'delimiter', ' ')
Walter Roberson
Walter Roberson 2012-5-30
  2 个评论
Kjersti Ensrud
Kjersti Ensrud 2019-2-22
Do you know how to get each .txt-file to start at a new line. Something like \n ?
Walter Roberson
Walter Roberson 2019-2-23
Is it the case that you are reading in a number of files, and building up one large numeric array from them, and that you want to write out the numeric array, but with an empty line between where the boundaries of the files used to be?

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