Add log2 and exp2.

Fix scimath to use log2.
Complex versions of these functions need to be added.
MPL also defines log2 with slightly different properties.
For instance, it returns an integer value for log2(2).

1 files changed, 1 insertions, 1 deletions

diff --git a/numpy/lib/scimath.py b/numpy/lib/scimath.py
index 0d765fa20..269d332bf 100644
--- a/numpy/lib/scimath.py
+++ b/numpy/lib/scimath.py
@@ -328,7 +328,7 @@ def log2(x):
     array([ 2.+4.5324j,  3.+4.5324j,  3.+0.j    ])
     """
     x = _fix_real_lt_zero(x)
-    return nx.log(x)/_ln2
+    return nx.log2(x)
 
 def power(x, p):
     """Return x**p.