Hello,

I was testing the following on https://try.jupyter.org/  and wondering why 
the plot sometimes disappears:

%matplotlib notebook
import numpy as np
import matplotlib.pyplot as plt

def f(p):
    plt.figure(2)
    nx = 10
    ny = 10
    x = np.linspace(1, nx, nx)
    y = np.linspace(1, ny, ny)
    xv, yv = np.meshgrid(x, y)

    rgb = np.zeros((nx*ny,3))
    rgb[:,0] += 1
    rgb[:][p-1] = [0,1,0]

    area=200
    plt.scatter(xv, yv, marker='s', s=area, c=rgb)

    plt.xticks([])
    plt.yticks([])
#    plt.show()

from ipywidgets import interact, interactive
interactive_plot = interactive(f, p=(0, 100))
interactive_plot

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