How to save data from a for loop?

Hello everyone ,

i will need your help. I am running a consequence of files with a for loop, which matlab is reading and making some calculations with their data. What i want to do is to save certain results from the calculations of every file that is running (from every file thas is going through the loop). I need to do that in xlsx or txt file. Thank you in advance!

p.s i managed to succeed in saving the graphics from every file that i plotted:

savefig (h1, sprintf('Experimental_drying_rates_%s.fig ', num2str(i)));
savefig (h2, sprintf('Evaporation_coefficent_beta_%s.fig ', num2str(i)));
savefig (h3, sprintf('Calculated_drying_rates_%s.fig ',  num2str(i)));

[Stephen23]

Note that rather than using num2str and sprintf like this:

sprintf('Experimental_drying_rates_%s.fig ', num2str(i))

you can use sprintf directly to convert the numeric value:

sprintf('Experimental_drying_rates_%d.fig ', i)
%                                  ^^ numeric format specifier!

https://www.mathworks.com/help/matlab/import_export/process-a-sequence-of-files.html

"I need to do that in xlsx or txt file."

https://www.mathworks.com/help/matlab/standard-file-formats.html

[Niya Bedzheva]

okay, thank you, got it. But still i can't find a way to save the variables i need after reading each file from the loop. I got six files that matlab is reading in order and after finishing calculations of every file i need to save a few variables into txt files (to every file that is read should attach a txt file with results).

[Niya Bedzheva]

i am trying with something like this

for i=1:N
    R=table (Time, beta, Sh, K, 'VariableNames' , {'Time', 'beta', 'Sh', 'K'});
    writetable(R,'Results_%d.txt',i);
end

but it gives me error: Wrong number of arguments.

[Stephen23]

writetable is not sprintf. Do not mix them up.

To generate the filename, use sprintf as I showed you:

F = sprintf('Results_%d.txt',i);

Then use that filename in writetable:

writetable(R,F)

[Niya Bedzheva]

Thank you very much, it worked! i just don't know how to accept your answer :/

Answer 1

[Stephen23]

Where T is your table:

for k = ...
    T = your table
    F = sprintf('Results_%d.txt',k);
    writetable(T,F)
end