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Adding semicolon and comma and saving it into .txt file

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I have a vector (2x6001) and I want to save it to into a .txt file,. But before saving it , I also want to add a semicolon after every even position and a comma after every odd position:
Let's say:
x=(x1,x2,x3,x4,x5,...)
and I want sth like this:
x=(x1,x2;x3,x4;x5,...)
How can I do this?
I don't have access to the writematrix function, only dlmwrite
I tried delimiter, but all the data will get the same delimiter.

Accepted Answer

Ildeberto de los Santos Ruiz
Try this low-level code:
-----------------------------------------
x = randi(9,[1,2*6001]); % ACTUAL DATA
fileID = fopen('data.txt','w');
for k = 1:2:numel(x)-1
fprintf(fileID,'%g,%g;',x(k),x(k+1));
end
fclose(fileID);
-----------------------------------------
Enjoy!

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