MATLAB: I converted double in CSV, but I need the comma at the end of each value

Hello everybody!

I'm a begginer in Matlab but I need to know how to do somethings for a internship. I need to convert a double to a CSV file; I did it with "writematrix" and it works!

The problem is that I need to put this *.CSV in another software and it wants each value delimited with comma.

I want something like this:

But I have this:

Can someone help me? Thank you

I'll show you a part of the code where are the variables that I need:

%inizializziamo un vettore di soli zeri in cui raccoglieremo i valori in mV da salvare
    sign1=zeros(size(P)); %P=P(:,1)
    for k=1:length(P)
        if P(k)==1
        sign1(k)=signdata(k);
        end
    end
    
    ----------
    
    writematrix(sign1,'myFile.CSV','Delimiter',','); %converto matrice in file CSV

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