% This just displays what's happening for one x. In a graph!

y = 6171;
result(1) = y;
count = 1;

while y > 1 && count < threshold,
   
        % x is the start number. iterate, changing y!
        if mod(y,2)
            y = 3*y + 1;
        end
    
        y = y/2;
        result(count) = y;
        count = count+1;
    
end

x = 1:length(result);

plot(x,result,'x-')