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Merge pull request #6045 from minrk/nbformat4 nbformat v4
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NumPy and Matplotlib examples

First import NumPy and Matplotlib:

In [1]:
%matplotlib inline
import matplotlib
import matplotlib.pyplot as plt
print(matplotlib.backends.backend)

module://IPython.kernel.zmq.pylab.backend_inline
In [2]:
from IPython.display import set_matplotlib_formats
set_matplotlib_formats('png', 'pdf')
matplotlib.rcParams['figure.figsize'] = (2,1)
In [3]:
ip.display_formatter.formatters['application/pdf'].type_printers
Out[3]:
{matplotlib.figure.Figure: <function IPython.core.pylabtools.<lambda>>}
In [4]:
import numpy as np

Now we show some very basic examples of how they can be used.

In [5]:
a = np.random.uniform(size=(100,100))
In [6]:
a.shape
Out[6]:
(100, 100)
In [7]:
evs = np.linalg.eigvals(a)
In [8]:
evs.shape
Out[8]:
(100,)

Here is a very long heading that pandoc will wrap and wrap and wrap and wrap and wrap and wrap and wrap and wrap and wrap and wrap and wrap and wrap

Here is a cell that has both text and PNG output:

In [9]:
plt.hist(evs.real)
Out[9]:
(array([97,  2,  0,  0,  0,  0,  0,  0,  0,  1]),
 array([ -2.59479443,   2.67371141,   7.94221725,  13.21072308,
         18.47922892,  23.74773476,  29.0162406 ,  34.28474644,
         39.55325228,  44.82175812,  50.09026395]),
 <a list of 10 Patch objects>)
No description has been provided for this image 
def foo(bar=1):
    """docstring"""
    raise Exception("message")