Triangular Membership Function

alpha=10;
beta = 25;
gamma = 40;
for i=1:10
  x(i) = i*5
  if x(i)<=alpha
    y(i)=0;
  elseif x(i)<=beta
    y(i) = (x(i)-alpha)/(beta-alpha)
  elseif x(i) <=gamma
     y(i)=(gamma-x(i))/(gamma-beta);
  else
    y(i) = 0;
  end
end
plot(x,y)