.. 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 :class: sphx-glr-single-img .. code-block:: default import matplotlib.pyplot as plt import numpy as np def fahrenheit2celsius(temp): """ Returns temperature in Celsius. """ return (5. / 9.) * (temp - 32) 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() .. _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 :download:`Download Python source code: fahrenheit_celsius_scales.py ` .. container:: sphx-glr-download :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 `_