How do I save data to a TXT file?
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Bernoulli Lizard
on 5 Sep 2012
Edited: MathWorks Support Team
on 5 Jun 2024
How do I save data to a TXT file? I want to create a simple two column text file, where the first column is the data from a n x 1 matrix and the second column is a different n x 1 matrix. I also want column headings in the first row of each column.
2 Comments
Raghunandan V
on 4 Oct 2018
Edited: per isakson
on 20 Jan 2019
the problem is you are trying to store them in an array whereas you have to store them in a cell array since each file is of different size Try this code
fileName={'new1.txt', 'new2.txt', 'new3.txt'};
%open file identifier
fid=fopen('MyFile.txt','w');
for k=1:length(fileName)
%read the file name as string including delimiters and next lines
List=textread(fileName{1,k},'%s','delimiter','\n');
%arrange them in order of k if you want in a cell array
FinalList{k,1}=List;
%or print them into a file.
fprintf(fid, [cell2mat(List) '\n']);
end
%close file indentifier
fclose(fid)
Accepted Answer
José-Luis
on 4 Sep 2024
Edited: MathWorks Support Team
on 5 Jun 2024
To write a text file with columns of data that have variable names, use the “writetable” function. First, create the data to write, put it in a table with variable names, and then write the data to text file.
% Create two columns of data
A = rand(10,1);
B = rand(10,1);
% Create a table with the data and variable names
T = table(A, B,'VariableNames',{'A', 'B'});
% Write data to text file
writetable(T,'MyFile.txt')
For more information see:
Write table to file
https://www.mathworks.com/help/matlab/ref/writetable.html
Starting in MATLAB R2019a
, you can also use the "writematrix" function to write a matrix to a file. For example:
M = magic(5);
writematrix(M,"M.txt");
For a complete list of export functions, see:
Supported File Formats for Import and Export
https://www.mathworks.com/help/matlab/import_export/supported-file-formats-for-import-and-export.html
13 Comments
celine azizieh
on 14 Aug 2017
Better to use: fid=fopen('MyFile.txt','wt');
instead of fid=fopen('MyFile.txt','w');
otherwise when opening the file with notepad, there is not return to the line... everything is written on one line.
More Answers (3)
WAEL Al-dulaimi
on 8 Dec 2017
In case I want to open a text file and I have a loop that each time give me different results {x1, x1...xn}. So how can I save all the data that I got from the loop in different names such as y1, y2 .... etc? And under each one of them, I can find the result that I got. I'll appreciate your help. thank you
1 Comment
Peter
on 8 Dec 2017
It is unclear form your question what you are trying to loop across. It sounds like your trying to read from a single text file; is this true? In any case you should be able to just assign the value that you read to a new variable. If you know how long each data set is you can preallocate matrices for those variables, but that's not necessarily necessary.
Ahmed Saeed Mansour
on 20 Jan 2019
How can we save transient CFD results in a file during running the code?
1 Comment
Venkatanarasimha Hegde
on 17 Mar 2023
Its better if you store the time data at different instants along another matrix dimension (possible in C not sure about matlab) or you can concatinate the new data to existing file, so while visualising you can access after the end index of each time instant.
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