median: fix off-by-one

Who would have thought list indexes start at 0?

Signed-off-by: Johannes Weiner <hannes@cmpxchg.org>

1 files changed, 1 insertions, 1 deletions

diff --git a/median b/median
index c6832dc..f82fbc8 100755
--- a/median
+++ b/median
@@ -14,7 +14,7 @@ def median_sorted(v):
     if l % 2:
         return v[m]
     else:
-        return mean([v[m], v[m + 1]])
+        return mean([v[m - 1], v[m]])
 
 parser = argparse.ArgumentParser()
 parser.add_argument('-m', '--minmax', action='store_true')