Hello,
I have thought of this might interesting to share. Register at www.sagenb.org or try on your local Sage-notebook and using the following code:
Simple example demonstrating how to interact with matplotlib directly.
Comment plt.clf() to get the plots overlay in each update.
Gokhan Sever & Harald Schilly (2010-01-24)
from scipy import stats
import numpy as np
import matplotlib.pyplot as plt
@interact
def plot_norm(loc=(0,(0,10)), scale=(1,(1,10))):
rv = stats.norm(loc, scale)
x = np.linspace(-10,10,1000)
plt.plot(x,rv.pdf(x))
plt.grid(True)
plt.savefig(‘plt.png’)
plt.clf()
A very easy to use example, also well-suited for learning and demonstration purposes.
Posted at: http://wiki.sagemath.org/interact/graphics#Interactwithmatplotlib
Have fun 
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Gökhan