MATLAB: Loop to iterate ode45 function

MATLABode45

Hello, I'm having some issue using the ode45 function. In the function F, I assigned e = 0, but I want to make a loop that assigns e = 0:0.2:1 and use the ode45 function to plot the equation for each e in one plot. The code below is what I currently have, but I keep on getting errors when I try looping the function. Any ideas? 
%e = 0:0.2:1;
[t,x]=ode45(@F,[0,20],[0,1]);
plot(t,x(:,1))
    
function xp = F(t,x)
    e = 0;
    xp = zeros(2,1);
    xp(1) = x(2);
    xp(2) = -x(1) - e*x(1)^3;
end

Best Answer

figure;
axes('NextPlot', 'add');
for e = 0:0.2:1
    [t, x] = ode45(@(t, y) F(t, y, e), [0, 20], [0, 1]);
    plot(t, x(:,1))
end
function xp = F(t, x, e)
    xp    = zeros(2,1);
    xp(1) = x(2);
    xp(2) = -x(1) - e*x(1)^3;
end
Here you create an "anonymous function", which appends the 3rd input argument e.
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