我刚开始学习如何用Python编写代码。我很感兴趣
u[x,t]
矩阵。我试过了return u
,它给我一个错误。for
循环的位置正确且运行正常。这是我的代码:
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?
我看到一些动画代码太复杂,我无法理解。任何人都可以帮我解决上面提到的问题吗?谢谢!
答案 0 :(得分:3)
在文件的末尾执行:
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()
这里是mp4的gif: