Yes!
fid = fopen('output_file.txt','wt'); % Open output_file.txt
% 'w' means overwrite everything that is already in the file, use 'a' to
% append instead. 't' means format more like a text file
for i=1:length(text)
linie=find(key(i)==alfabet);
coloana=find(text(i)==mat(linie,:));
decrypt=[decrypt mat(1,coloana)];
fprintf(fid,'%s\n',coloana); % To the file already opened (identified by fid)
% write a single line (%s) followed by a newline symbol (\n)
% '%s' tells the function to expect a string input; if the input
% you want to write to the file is not a string you'll need to change
% the formatting identifier. A link to the function is below.
end
decrypt
fclose(fid) % close the opened file
