Combine graphs into one?

I am solving a dampened spring problem, and am asked to solve the system of ODEs using different values for the coefficient and plot all results in the same graph.

Right now, I have 3 different files (one for each value of coefficient). So, each one has a slightly different system of ODEs.

I have used ode45 to solve them and plot them. But now I am wondering how can I "combine" the 3 plots into one? I seem to remember it's not so hard when you are working on the same file, but here I am not. So, also, is solving the 3 systems on a single file possible?

Here is one of the files for reference:

function overdamped

tspan = 0:0.5:15;
[t,y] = ode45(@f,tspan,[1; 0]);

plot(t,y(:,1))
xlabel('time in s');
ylabel('distance in m');

function dydt = f(~,y)
dydt = zeros(2,1);
dydt(1) = y(2);
dydt(2) = -10*y(2) - y(1);
end
Sol = [t y(:,1)]
end

Thanks

Answer 1

[Jan]

tspan = 0:0.5:15;
[t1, y1] = ode45(@f1, tspan, [1, 0]);
[t2, y2] = ode45(@f2, tspan, [1, 0]);
[t3, y3] = ode45(@f3, tspan, [1, 0]);

axes('NextPlot', 'add');  % Equivalent to:  hold all
plot(tspan, y1(:,1));
plot(tspan, y2(:,1));
plot(tspan, y3(:,1));
xlabel('time in s');
ylabel('distance in m');

function dydt = f1(~, y)
dydt = [y(2); -10*y(2) - y(1)];
end
function dydt = f2(~, y)
dydt = [y(2); -2*y(2) - y(1)];
end
function dydt = f3(~, y)
dydt = [y(2); 17*y(2) - y(1)];
end