Add Phil Elson's percentage histogram example

dmcdougall · dmcdougall · commit 0c22d3bd5b06 · 2012-08-27T15:27:34.000+01:00
diff --git a/examples/pylab_examples/histogram_percent_demo.py b/examples/pylab_examples/histogram_percent_demo.py
@@ -0,0 +1,22 @@
+from numpy.random import randn
+import matplotlib.pyplot as plt
+from matplotlib.ticker import FuncFormatter
+
+def to_percent(y, position):
+    # Ignore the passed in position. This has the effect of scaling the default
+    # tick locations.
+    return str(100 * y)
+
+x = randn(5000)
+
+# Make a normed histogram. It'll be multiplied by 100 later.
+plt.hist(x, bins=50, normed=True)
+
+# Create the formatter using the function to_percent. This multiplies all the
+# default labels by 100, making them all percentages
+formatter = FuncFormatter(to_percent)
+
+# Set the formatter
+plt.gca().yaxis.set_major_formatter(formatter)
+
+plt.show()
