how to generate waveform graph?

Can anyone help me generate code to produce this waveform graph? This is wave equation that using finite difference method. Thank you very much for helping..

Answer 1

[the cyclist]

Here is a simple script that will plot the function sin(L*x). Perhaps you can adapt it to plot your function u(x,t):

L = 0.5;

x = 0 : 0.1 : 60;
u = sin(L*x);

figure

plot(x,u)

[sing lai]

Thank you, i get the idea, but how to apply finite difference method into this code? thanks for your help~