You are reading an old version of the documentation (v2.2.2). For the latest version see https://matplotlib.org/stable/api/_as_gen/matplotlib.pyplot.set_cmap.html
Version 2.2.2
matplotlib
Fork me on GitHub

matplotlib.pyplot.set_cmap

matplotlib.pyplot.set_cmap(cmap)[source]

Set the default colormap. Applies to the current image if any. See help(colormaps) for more information.

cmap must be a Colormap instance, or the name of a registered colormap.

See matplotlib.cm.register_cmap() and matplotlib.cm.get_cmap().