.. only:: html
.. note::
:class: sphx-glr-download-link-note
Click :ref:`here ` to download the full example code
.. rst-class:: sphx-glr-example-title
.. _sphx_glr_gallery_subplots_axes_and_figures_fahrenheit_celsius_scales.py:
=================================
Different scales on the same axes
=================================
Demo of how to display two scales on the left and right y axis.
This example uses the Fahrenheit and Celsius scales.
.. image:: /gallery/subplots_axes_and_figures/images/sphx_glr_fahrenheit_celsius_scales_001.png
:alt: Two scales: Fahrenheit and Celsius
:class: sphx-glr-single-img
.. code-block:: default
import matplotlib.pyplot as plt
import numpy as np
def fahrenheit2celsius(temp):
"""
Returns temperature in Celsius given Fahrenheit temperature.
"""
return (5. / 9.) * (temp - 32)
def make_plot():
# Define a closure function to register as a callback
def convert_ax_c_to_celsius(ax_f):
"""
Update second axis according with first axis.
"""
y1, y2 = ax_f.get_ylim()
ax_c.set_ylim(fahrenheit2celsius(y1), fahrenheit2celsius(y2))
ax_c.figure.canvas.draw()
fig, ax_f = plt.subplots()
ax_c = ax_f.twinx()
# automatically update ylim of ax2 when ylim of ax1 changes.
ax_f.callbacks.connect("ylim_changed", convert_ax_c_to_celsius)
ax_f.plot(np.linspace(-40, 120, 100))
ax_f.set_xlim(0, 100)
ax_f.set_title('Two scales: Fahrenheit and Celsius')
ax_f.set_ylabel('Fahrenheit')
ax_c.set_ylabel('Celsius')
plt.show()
make_plot()
.. _sphx_glr_download_gallery_subplots_axes_and_figures_fahrenheit_celsius_scales.py:
.. only :: html
.. container:: sphx-glr-footer
:class: sphx-glr-footer-example
.. container:: sphx-glr-download sphx-glr-download-python
:download:`Download Python source code: fahrenheit_celsius_scales.py `
.. container:: sphx-glr-download sphx-glr-download-jupyter
:download:`Download Jupyter notebook: fahrenheit_celsius_scales.ipynb `
.. only:: html
.. rst-class:: sphx-glr-signature
Keywords: matplotlib code example, codex, python plot, pyplot
`Gallery generated by Sphinx-Gallery
`_