matplotlib slider not working when called from a function

Question

I have the following code, which shows a graph with a slinding bar

    from matplotlib.widgets import Slider
    import matplotlib.pyplot as plt
    from numpy i         


        

Answer 1

Based on this you need to keep the sliders around globally.

Your example would only need to be slightly adjusted:

def myplot(): 
    (... same code as above)
    return szoom

keep_sliders = myplot()

Answer 2

Okay, here is my working version with some improvements (e.g. lambda):

from matplotlib.widgets import Slider
import matplotlib.pyplot as plt
from numpy import arange, sin, pi

def myplot():
    t = arange(0.0, 10.0, 0.01)

    fig = plt.figure(figsize=[30, 20])
    ax = plt.subplot(111)
    plt.tight_layout()
    plt.plot(t, sin(t * 10))
    plt.ylim((-2, 2))
    plt.xlim((0, 1))

    axzoom = plt.axes([0.15, 0.05, 0.65, 0.03])
    szoom = Slider(axzoom, 'Window', 1, 2)
    szoom.on_changed(lambda val: ax.set_xlim([val, val + 1]))

    fig.canvas.draw_idle()
    plt.show()

myplot()