plot and parallel translation???

please look at the picture. this is the code of picture.

clc;clear;
syms w
for m = 2:1:5
    for n = 1:1:m
      a(n)=(-1*sin(((2*n-1)*pi)/(2*m))+i*cos(((2*n-1)*pi)/(2*m)));
      if n==1
        F=1/(i*w-a(n));
      else
        F=F*1/(i*w-a(n));
      end
    end
    ezplot(angle(F)*180/pi,[0,3])
    hold on
    grid on
end

I want 0 or more of the graph wants to move it to 360 degrees subtract parallel . beacause atan2 have range(-pi ~ pi). I think It cause The results graphs are separated. but I have no Idea about solve this problem..... please help me.....

[Nitin Khola]

If you want to impose a condition on values greater than zero, you can do so using logical operators. But, I am not entirely sure about your question. Please phrase it more clearly so that we know what question you are trying to ask.