Plotting data in matlab

Hi,

I wanted to plot an ode, but when i do it plots 2 values, y(1) and
y(2), is there any way that i can get it to plot only one????

function dydt = pen(t,y)

m = 10;
l = 10;
g = 9.81;

dydt = [y(2); -g*sin(y(1))/l];

and

[t,y] = ode45(@pen,[0 20], [pi/2 0]);
plot(t,y);

is used to execute.

Many Thanks

.

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