create a function that increments a counter by 2 every time it is called in matlab

main.m
function count = incrementCounter()
% this function increments a counter by 2 every time it is called
persistent counter    % declare the counter as persistent so it retains its value between function calls
if isempty(counter)   % check if the counter is empty (i.e., on the first function call)
    counter = 0;      % initialize the counter to 0
end
counter = counter + 2; % increment the counter by 2
count = counter;       % set the output variable to the new counter value
end
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