How do I save data to a TXT file?

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Bernoulli Lizard 2012-9-5

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编辑： MathWorks Support Team 2024-6-5

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.

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Raghunandan V 2018-10-4

编辑：per isakson 2019-1-20

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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)

Yeswanth Kaushik 2023-6-8

try writetable or writecell commands.

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José-Luis 2024-9-4

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编辑：MathWorks Support Team 2024-6-5

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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

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lafnath p 2016-11-14

how to get the size of data in file

celine azizieh 2017-8-14

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.

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WAEL Al-dulaimi 2017-12-8

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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

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Peter 2017-12-8

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.

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Ahmed Saeed Mansour 2019-1-20

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How can we save transient CFD results in a file during running the code?

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Venkatanarasimha Hegde 2023-3-17

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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