我剛開始學習如何用Python編碼.我有興趣

>如何復制u [x,t]矩陣.我嘗試返回u,這使我出錯.

>如果此代碼中for循環的位置正確并且可以正常運行.

>最重要的是,如何為該一維波方程制作動畫,在其中我可以看到波是如何從高斯演化成并分裂成兩個相同高度的波的.

這是我的代碼：

import numpy as np

import matplotlib.pyplot as plt

dx=0.1 #space increment

dt=0.05 #time increment

tmin=0.0 #initial time

tmax=2.0 #simulate until

xmin=-5.0 #left bound

xmax=5.0 #right bound...assume packet never reaches boundary

c=1.0 #speed of sound

rsq=(c*dt/dx)**2 #appears in finite diff sol

nx = int((xmax-xmin)/dx) + 1 #number of points on x grid

nt = int((tmax-tmin)/dt) + 2 #number of points on t grid

u = np.zeros((nt,nx)) #solution to WE

#set initial pulse shape

def init_fn(x):

val = np.exp(-(x**2)/0.25)

if val<.001:>

return 0.0

else:

return val

for a in range(0,nx):

u[0,a]=init_fn(xmin+a*dx)

u[1,a]=u[0,a]

#simulate dynamics

for t in range(1,nt-1):

for a in range(1,nx-1):

u[t+1,a] = 2*(1-rsq)*u[t,a]-u[t-1,a]+rsq*(u[t,a-1]+u[t,a+1])

# Where is the code that is needed to run the simulation?

我看到一些動畫代碼對我來說太復雜了.有人可以幫我解決上面提到的問題嗎？謝謝！

解決方法:

在文件末尾執行以下操作：

fig = plt.figure()

plts = [] # get ready to populate this list the Line artists to be plotted

plt.hold("off")

for i in range(nt):

p, = plt.plot(u[i,:], 'k') # this is how you'd plot a single line...

plts.append( [p] ) # ... but save the line artist for the animation

ani = animation.ArtistAnimation(fig, plts, interval=50, repeat_delay=3000) # run the animation

ani.save('wave.mp4') # optionally save it to a file

plt.show()

這是mp4的gif：

標簽：matplotlib,animation,waveform,python,numpy

來源： https://codeday.me/bug/20191121/2049615.html

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