Modify line / plot in IPython notebook "interact"

Question

Is there a way to modify the plot inside IPython "interact" function rather than replotting it?

In case when the plot contains a lot of heavy graphics (or some parts require heavy calculations) it would be much faster than doing the plot from the scratch.

I'm trying the following code, but it does not work: after changing the slider the whole plot becomes blank.

%matplotlib inline
import matplotlib.pyplot as plt
from IPython.html.widgets import interact
import numpy as np

x = np.arange(0,11.)
y1 = x / 10.
y2 = np.random.rand(len(x))

plt.plot(x,y1)
plt.plot(x,y2)

plt.ylim([0,1])
ax = plt.gca()

def replot_it(a):
    ax.lines.pop(1)

    y = (x/10.)**a
    ax.plot(x,y)

interact(replot_it, a=(0.,5.))

I would appreciate any suggestions.

tacaswell · Accepted Answer · 2015-05-28 03:24:02Z

1

If you have IPython > 3.0 and mpl > 1.4: run this is one cell:

%matplotlib notebook
import matplotlib.pyplot as plt
from IPython.html.widgets import interact
import numpy as np

x = np.arange(0,11.)
y1 = x / 10.
y2 = np.random.rand(len(x))
fig, ax = plt.subplots()
ln1, = ax.plot(x,y1)
ln2, = ax.plot(x,y2)

ax.set_ylim([0,1])


def replot_it(a):
    y = (x/10.)**a
    ln2.set_ydata(y)
    ax.figure.canvas.draw()

and

interact(replot_it, a=(0.,5.))

in the cell below it.

answered May 28, 2015 at 3:24

tacaswell

88.2k23 gold badges222 silver badges203 bronze badges

Sign up to request clarification or add additional context in comments.

Collectives™ on Stack Overflow

Modify line / plot in IPython notebook "interact"

1 Answer 1

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

Comments

Your Answer

Sign up or log in

Post as a guest

Related