Animating the Plot

We now define a function update$\_$plot $($i$)$ that updates all three graphs. The time at time step no$.i$ is

$t=t_0+i*t$

where $t$ is time step size. For our animation, a step size of $t={10}^{-3}T($i$.$e$.\frac{1}{1000}$ th of the period$)$ works well.

Exercise $3$

Complete the function update$\_$plot $($i$)$ below. It should update the "ydata" for line$1,$ line $2$ and line$3$ at time t$0+$i$*$dt $.$ Do not alter the

return statement $($the last line in update$\_$plot $()).$ Remember that the code inside the function must be indented.

In $[10]$:

Number of time steps: $2000$

In $[10]$: $1$ # This cell is used for internal tests. Do not delete or modify.

The animation

Now we're ready to run the animation. Execute the cell below and scroll up to the plot. When the animation stops, you can replay it by simply running the

code cell below again.

Verify that you see:

the green wave traveling right

the animation code is below this and it is correct but im sure what i am doing wrong with this part in python