Applying a Plot to cftool

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Ausamah Hobbi
Ausamah Hobbi 2016-2-14
Hey! Please help.
I am relatively new to Matlab and I would love some help. I have a random 5x5 binary code with zeroes and ones. With that I have plotted it using:
x=randi([0 1], 5);
index = find(1);
x(index) = [];
stairs([x,x(end)]);
print('tempplot','-dpng');
Which looks like the attached file. With this function/plot now I am trying to apply the Fourier Series Approximation using cftool (which I have). But every time I do it it says "Input must be two, three, or four variables or a curve fitting session file." I am trying to find the approximation of this function. Is there a way around it? Someone please help! I very much appreciate it in advance.

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