fix number of bins: yet another off-by-one

diff --git a/coinflip-histo.py b/coinflip-histo.py
index 2a737ce2b8689988a8d29d3ac284ce64f5637e71..65c8a44581fa4000b9ac00ebbc6ea2ce7c04a379 100755 (executable)
--- a/coinflip-histo.py
+++ b/coinflip-histo.py
@@ -16,5 +16,6 @@ repeats = int(sys.argv[2])
 
 vals = [sum(flipcoins(flips)) for i in range(repeats)]
 
-plot.hist(vals, bins=flips, align='left')
+# The number of bins must be flips+1: why?
+plot.hist(vals, bins=flips+1, align='left')
 plot.show()