MATLAB calls function every time I compile the file

Question

I am fairly new to MATLAB, and I wrote the following function to rotate a vector by 90 degrees anticlockwise.

function w = rotate(v)
R=[0,-1;1,0];
w=R*v;
end

but every time I compile the file, MATLAB calls rotate with an argument v which I have not defined yet, which leads to an error. How do I stop MATLAB from calling this function when I compile the file? I have tried to fiddle with the Run icon but the most I was able to do was to give a different input to rotate every time I compiled the file. (I'm using MATLAB R2020a)