combine multiple text files into one text file

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Cody on 5 Jul 2011
Commented: michael fried on 22 Mar 2022
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....
Thanks a lot

Accepted Answer

Fangjun Jiang
Fangjun Jiang on 5 Jul 2011
In DOS, I used to use this all the time.
copy 1.txt+2.txt+3.txt MyBigFat.txt
In MATLAB, you can use
system('copy 1.txt+2.txt+3.txt MyBigFat.txt')
michael fried
michael fried on 22 Mar 2022
Use parameter "b" (binary) in order to avoid that character...:
In Windows Command Line:
copy /b 1.txt+2.txt+3.txt MyBigFat.txt
Or in Matlab:
system('copy /b 1.txt+2.txt+3.txt MyBigFat.txt')

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More Answers (3)

Jason Ross
Jason Ross on 5 Jul 2011
Keep in mind you don't even need MATLAB to do this. You can do it with built in OS commands on Windows or UNIX
type 1.txt > bigfile.txt
type 2.txt >> bigfile.txt
touch bigfile.txt
cat 1.txt >> bigfile.txt
cat 2.txt >> bigfile.txt
This will result in one big file that's in the format you want. Of course, there's no error checking, but the big upside is going to be that there is very little overhead so your processing may go considerably faster depending on the number of files you have to do.
Depending on the order of the file names, this may also be very easily scriptable. You will, of course need to use one of the import functions in MATLAB to read it in eventually, as well.

Nirmal Gunaseelan
Nirmal Gunaseelan on 5 Jul 2011
I prefer to use TEXTREAD in such cases. You could pass in different file names in every call and use the same matrix with different row numbers as output variables.
Fangjun Jiang
Fangjun Jiang on 5 Jul 2011
What Nirmal meant was to use textread() to read each file and then combine them in MATLAB. You know it's very easy to concatenate data in MATLAB, do you?
a=[1 3 4 8]
b=[3 5 7 3]

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Alex Z.
Alex Z. on 16 Jun 2017
This can be done in Easymorph (it's free) using Append transformation. It can work with as many as 10 millions rows in the file.

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