Remove mlab.log2

dstansby · dstansby · commit f336729b1d37 · 2018-09-29T11:05:09.000+01:00
diff --git a/doc/api/next_api_changes/2018-09-18-DS.rst b/doc/api/next_api_changes/2018-09-18-DS.rst
@@ -14,6 +14,7 @@ in Matplotlib 2.2 has been removed. See below for a list:
 - `mlab.frange` (use numpy.arange instead)
 - `mlab.identity` (use numpy.identity instead)
 - `mlab.base_repr`
+- `mlab.log2` (use numpy.log2 instead)
 - `mlab.cohere_pairs` (use scipy.signal.coherence instead)
 - `mlab.entropy` (use scipy.stats.entropy instead)
 - `mlab.normpdf` (use scipy.stats.norm.pdf instead)
diff --git a/lib/matplotlib/mlab.py b/lib/matplotlib/mlab.py
@@ -1270,25 +1270,6 @@ def binary_repr(number, max_length=1025):
     return ''.join(map(repr, digits)).replace('L', '')
 
 
-@cbook.deprecated("2.2", 'numpy.log2')
-def log2(x, ln2=math.log(2.0)):
-    """
-    Return the log(*x*) in base 2.
-
-    This is a _slow_ function but which is guaranteed to return the correct
-    integer value if the input is an integer exact power of 2.
-    """
-    try:
-        bin_n = binary_repr(x)[1:]
-    except (AssertionError, TypeError):
-        return math.log(x)/ln2
-    else:
-        if '1' in bin_n:
-            return math.log(x)/ln2
-        else:
-            return len(bin_n)
-
-
 @cbook.deprecated("2.2")
 def ispower2(n):
     """
diff --git a/lib/matplotlib/pylab.py b/lib/matplotlib/pylab.py
@@ -232,7 +232,7 @@
     binary_repr, csv2rec,
     demean, detrend, detrend_linear, detrend_mean, detrend_none,
     ispower2, isvector,
-    log2, movavg,
+    movavg,
     window_hanning, window_none)
 
 from matplotlib import cbook, mlab, pyplot as plt
