frame stackplot limits in billions to make numbers clearer

story645 · rcomer · story645 · commit 483fdb472620 · 2023-11-21T15:08:54.000-05:00
Co-authored-by: Ruth Comer &lt;10599679+rcomer@users.noreply.github.com&gt;
diff --git a/galleries/examples/lines_bars_and_markers/stackplot_demo.py b/galleries/examples/lines_bars_and_markers/stackplot_demo.py
@@ -16,15 +16,17 @@
 import matplotlib.pyplot as plt
 import numpy as np
 
+import matplotlib.ticker as mticker
+
 # data from United Nations World Population Prospects (Revision 2019)
 # https://population.un.org/wpp/, license: CC BY 3.0 IGO
 year = [1950, 1960, 1970, 1980, 1990, 2000, 2010, 2018]
 population_by_continent = {
-    'africa': [228, 284, 365, 477, 631, 814, 1044, 1275],
-    'americas': [340, 425, 519, 619, 727, 840, 943, 1006],
-    'asia': [1394, 1686, 2120, 2625, 3202, 3714, 4169, 4560],
-    'europe': [220, 253, 276, 295, 310, 303, 294, 293],
-    'oceania': [12, 15, 19, 22, 26, 31, 36, 39],
+    'Africa': [.228, .284, .365, .477, .631, .814, 1.044, 1.275],
+    'the Americas': [.340, .425, .519, .619, .727, .840, .943, 1.006],
+    'Asia': [1.394, 1.686, 2.120, 2.625, 3.202, 3.714, 4.169, 4.560],
+    'Europe': [.220, .253, .276, .295, .310, .303, .294, .293],
+    'Oceania': [.012, .015, .019, .022, .026, .031, .036, .039],
 }
 
 fig, ax = plt.subplots()
@@ -33,7 +35,9 @@
 ax.legend(loc='upper left', reverse=True)
 ax.set_title('World population')
 ax.set_xlabel('Year')
-ax.set_ylabel('Number of people (millions)')
+ax.set_ylabel('Number of people (billions)')
+# add tick at every 200 million people
+ax.yaxis.set_minor_locator(mticker.MultipleLocator(.2))
 
 plt.show()
 
