How to i plot curve graph for equation with condition?

i want to plot this equation into graph.. but i only got a straight line..

a=3;

l=0.15;

m=0.5;

D=0.4;

wn=sqrt(9.81/l);

t = 0:0.05:(a*pi/wn);

x0=(D/2)*(1-cos(wn/a)*t);

plot(t,x0)

attached with me is graph i want to visualize...

Answer 1

[langrg]

A parenthesis is missing in your formula (look your print), there is an closing parenthesis after "t", but there is no opening parenthesis associated.

I've tried this, that seems to work:

a=3;
l=0.15;
m=0.5;
D=0.4;
wn=sqrt(9.81/l);
t = 0:0.05:(a*pi/wn);
x0=(D/2)*(1-cos((wn/a)*t));
plot(t,x0);

[Artoria Pendragon]

thanks a lot...i really appreciate your helps....