Merge pull request rougier#67 from bruno314/off-by-one

Off by one error

Author: rougier

02-introduction.rst

@@ -156,7 +156,7 @@ and you don't need to read this book).
 .. code:: python
           
    def function_1(seq, sub):
-       return [i for i in range(len(seq) - len(sub)) if seq[i:i+len(sub)] == sub]
+       return [i for i in range(len(seq) - len(sub) +1) if seq[i:i+len(sub)] == sub]
 
    def function_2(seq, sub):
        target = np.dot(sub, sub)

code/random_walk.py

@@ -47,7 +47,7 @@ def random_walk_fastest(n=1000):
 # -----------------------------------------------------------------------------
 # Readable but slow
 def find_crossing_1(seq, sub):
-    return [i for i in range(len(seq) - len(sub)) if seq[i:i+len(sub)] == sub]
+    return [i for i in range(len(seq) - len(sub) +1) if seq[i:i+len(sub)] == sub]
 
 # Fast but hardly readable
 def find_crossing_2(seq, sub):