1""" 2=============== 3Date Demo Rrule 4=============== 5 6Show how to use an rrule instance to make a custom date ticker - here 7we put a tick mark on every 5th easter 8 9See https://dateutil.readthedocs.io/en/stable/ for help with rrules 10""" 11import matplotlib.pyplot as plt 12from matplotlib.dates import (YEARLY, DateFormatter, 13 rrulewrapper, RRuleLocator, drange) 14import numpy as np 15import datetime 16 17# Fixing random state for reproducibility 18np.random.seed(19680801) 19 20 21# tick every 5th easter 22rule = rrulewrapper(YEARLY, byeaster=1, interval=5) 23loc = RRuleLocator(rule) 24formatter = DateFormatter('%m/%d/%y') 25date1 = datetime.date(1952, 1, 1) 26date2 = datetime.date(2004, 4, 12) 27delta = datetime.timedelta(days=100) 28 29dates = drange(date1, date2, delta) 30s = np.random.rand(len(dates)) # make up some random y values 31 32 33fig, ax = plt.subplots() 34plt.plot_date(dates, s) 35ax.xaxis.set_major_locator(loc) 36ax.xaxis.set_major_formatter(formatter) 37ax.xaxis.set_tick_params(rotation=30, labelsize=10) 38 39plt.show() 40