#!/usr/bin/env python
# coding: utf-8

# This notebook is part of the `nbsphinx` documentation: https://nbsphinx.readthedocs.io/.

# # Using Cell Metadata to Select a Thumbnail
# 
# If the [nbsphinx-thumbnail](cell-tag.ipynb) cell tag is not enough,
# you can use cell metadata to specify more options.
# 
# The last cell in this notebook has this metadata:
# 
# ```json
# {
#     "nbsphinx-thumbnail": {
#         "tooltip": "This tooltip message was defined in cell metadata"
#     }
# }
# ```
# 
# If there are multiple outputs in the selected cell,
# the last one is used.
# See [Choosing from Multiple Outputs](multiple-outputs.ipynb)
# for how to select a specific output.

# In[ ]:


import matplotlib.pyplot as plt
import numpy as np


# In[ ]:


plt.rcParams['image.cmap'] = 'coolwarm'
plt.rcParams['image.origin'] = 'lower'


# Some example data stolen from
# https://matplotlib.org/examples/pylab_examples/pcolor_demo.html:

# In[ ]:


x, y = np.meshgrid(np.arange(-3, 3, 0.1), np.arange(-2, 2, 0.1))
z = (1 - x / 2 + x ** 5 + y ** 3) * np.exp(-x ** 2 - y ** 2)


# In[ ]:


zmax = np.max(np.abs(z))


# In[ ]:


fig, ax = plt.subplots(figsize=[5, 3.5])
ax.imshow(z, vmin=-zmax, vmax=zmax)