A code and plot a graph for a projectile motion of a ball
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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 件のコメント
Scott MacKenzie
2021 年 6 月 2 日
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.
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James Tursa
2021 年 6 月 11 日
編集済み: James Tursa
2021 年 6 月 11 日
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.
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