.. 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_ticks_and_spines_colorbar_tick_labelling_demo.py: ============================ Colorbar Tick Labelling Demo ============================ Produce custom labelling for a colorbar. Contributed by Scott Sinclair .. code-block:: default import matplotlib.pyplot as plt import numpy as np from matplotlib import cm from numpy.random import randn # Fixing random state for reproducibility np.random.seed(19680801) Make plot with vertical (default) colorbar .. code-block:: default fig, ax = plt.subplots() data = np.clip(randn(250, 250), -1, 1) cax = ax.imshow(data, cmap=cm.coolwarm) ax.set_title('Gaussian noise with vertical colorbar') # Add colorbar, make sure to specify tick locations to match desired ticklabels cbar = fig.colorbar(cax, ticks=[-1, 0, 1]) cbar.ax.set_yticklabels(['< -1', '0', '> 1']) # vertically oriented colorbar .. image:: /gallery/ticks_and_spines/images/sphx_glr_colorbar_tick_labelling_demo_001.png :alt: Gaussian noise with vertical colorbar :class: sphx-glr-single-img .. rst-class:: sphx-glr-script-out Out: .. code-block:: none [Text(1, -1, '< -1'), Text(1, 0, '0'), Text(1, 1, '> 1')] Make plot with horizontal colorbar .. code-block:: default fig, ax = plt.subplots() data = np.clip(randn(250, 250), -1, 1) cax = ax.imshow(data, cmap=cm.afmhot) ax.set_title('Gaussian noise with horizontal colorbar') cbar = fig.colorbar(cax, ticks=[-1, 0, 1], orientation='horizontal') cbar.ax.set_xticklabels(['Low', 'Medium', 'High']) # horizontal colorbar plt.show() .. image:: /gallery/ticks_and_spines/images/sphx_glr_colorbar_tick_labelling_demo_002.png :alt: Gaussian noise with horizontal colorbar :class: sphx-glr-single-img .. _sphx_glr_download_gallery_ticks_and_spines_colorbar_tick_labelling_demo.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: colorbar_tick_labelling_demo.py ` .. container:: sphx-glr-download sphx-glr-download-jupyter :download:`Download Jupyter notebook: colorbar_tick_labelling_demo.ipynb ` .. only:: html .. rst-class:: sphx-glr-signature Keywords: matplotlib code example, codex, python plot, pyplot `Gallery generated by Sphinx-Gallery `_