Plotting sine wave for a ODE Problem

Hello all, I need some help on trying to plot these as a sine wave curve in Matlab, but can't seem to figure out how. Here's what I have:

t=0:5

r1=[(9.81/16)-(2.40/4)]*exp(-2*t)+(9.81/8)*sin(2*t);

r2=[(9.81/16)-(2.45/4)]*exp(-2*t)+(9.81/8)*sin(2*t);

r3=[(9.81/16)-(2.50/4)]*exp(-2*t)+(9.81/8)*sin(2*t);

figure(1) plot(t,r1) grid on

figure(2) plot(t,r2) grid on

figure(3) plot(t,r3) grid on

They are in the right plot and looks. But can't seem to get them into the sine wave curve I need them in. Any help would be great. Thanks.

Answer 1

[Star Strider]

Use the linspace function to define ‘t’:

t = linspace(0,5);

[Jim Xiong]

That was easy. Thanks.

[Star Strider]

As always, my pleasure.