<p>我找到了一个黑客来做这个。定义一个单独的函数,比如“donothing”函数,它什么也不做。然后,在update函数内设置svlsr的值之前,将svlsr绑定从update更改为donothing,以便调用donothing函数而不是update。设置好_值后,将svlsr滑块重新绑定到update函数。以下是完整代码:</p>
<pre><code>import numpy as np
import matplotlib.pyplot as plt
from matplotlib.widgets import Slider
import sys
fig, ax = plt.subplots()
plt.subplots_adjust(left=0.25, bottom=0.25)
t = np.arange(0.0, 1.0, 0.001)
a0 = 5
f0 = 3
s = a0*np.sin(2*np.pi*f0*t)
l, = plt.plot(t,s, lw=2, color='red')
plt.axis([0, 1, -10, 10])
axcolor = 'lightgoldenrodyellow'
d0 = 0.0
c = 300000
z0 = d0/c
vmin = -300.0
vmax = 3000.0
zmin = -0.01
zmax = 2
axfreq = plt.axes([0.25, 0.1, 0.65, 0.03], facecolor=axcolor)
axz = plt.axes([0.25, 0.15, 0.65, 0.03], facecolor=axcolor)
svlsr = Slider(axfreq, 'VLSR', vmin, vmax, valinit=d0, valfmt=u'%1.1f')
sreds = Slider(axz, 'z', zmin, zmax, valinit=z0, valfmt=u'%1.4f')
def donothing(val): #The dummy function
pass
def update(val):
global d0, z0
delt = svlsr.val/c
z = sreds.val
svlsr.observers[svlsrcid] = donothing #Binding removed from update
if z!=0.0:
if z != z0:
delt = z
svlsr.set_val(z*c) #set_val causes infinite loop?? Now it doesn't.
svlsr.observers[svlsrcid] = update #Binded again with update
d0 = delt
z0 = z
fac = 1.0 + delt
l.set_xdata(t*fac)
fig.canvas.draw_idle()
svlsrcid = svlsr.on_changed(update) #Getting the id of the binding
sredscid = sreds.on_changed(update)
plt.show()
</code></pre>
<p>只删除带有disconnect的绑定将不起作用,因为它将给出“RuntimeError:dictionary changed size during iteration”错误。在</p>