A code and plot a graph for a projectile motion of a ball
13 次查看(过去 30 天)
显示 更早的评论
How do I write a code and plot a graph for a projectile motion of a ball thrown at 60 deg with a speed of 50 m/s using ode and runge kutta method.
Somebody please help
6 个评论
Scott MacKenzie
2021-6-2
You state that "the plot that appears comes blank". But, actually, there is no plot generated because the plot function never executes. You've got bugs in your code. Good luck.
回答(1 个)
James Tursa
2021-6-11
编辑:James Tursa
2021-6-11
Your main problem is that you don't have enough state variables. You have these two equations:
x'' = 0
y'' = -g
That's two 2nd order equations, so you need to have 2 * 2 = 4 state variables. The state variables you need to integrate are x, y, Vx, Vy. But you only integrate two of these state variables, x and y. You have no code for integrating Vx and Vy. You need to add code for integrating Vx and Vy.
You also are using the solution of x and y integration as the derivative functions, which is incorrect. For a Runge-Kutta method, just use the derivatives. The code would be patterned after:
x' = Vx
y' = Vy
Vx' = x'' = 0
Vy' = y'' = -g
You also use g for both gravity and a function handle, so to avoid confusion you might want to change one of these.
0 个评论
另请参阅
类别
在 Help Center 和 File Exchange 中查找有关 Ordinary Differential Equations 的更多信息
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!