Pi Membership Function

alpha=20;
betaa = 30;
gammaa = 40;
delta = 45;
for i=1:10
  x(i) = i*5
  if x(i)<=alpha
    y(i)=0;
  elseif x(i)<=betaa
    y(i) = (x(i)-alpha)/(betaa-alpha)
  elseif x(i) <=gammaa
      y(i) = 1;
   elseif x(i) <= delta
     y(i)=(delta-x(i))/(delta-gammaa);
  else
    y(i) = 0;
  end
end
plot(x,y)