DOC: Added np.bit_count (#19355)

numpy · Jul 12, 2021 · a5d88e1 · a5d88e1
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diff --git a/doc/release/upcoming_changes/19355.new_feature.rst b/doc/release/upcoming_changes/19355.new_feature.rst
@@ -0,0 +1,12 @@
+`np.bit_count` to compute the number of 1-bits in an integer
+------------------------------------------------------------
+
+This new function counts the number of 1-bits in a number.
+These work on all the numpy integer types, as well as the
+builtin arbitrary-precision `Decimal` and `long` types.
+
+.. code-block:: python
+
+    >>> a = np.array([2**i - 1 for i in range(16)])
+    >>> np.bit_count(a)
+    array([ 0,  1,  2,  3,  4,  5,  6,  7,  8,  9, 10, 11, 12, 13, 14, 15])
diff --git a/doc/source/reference/routines.math.rst b/doc/source/reference/routines.math.rst
@@ -169,3 +169,5 @@ Miscellaneous
    real_if_close
 
    interp
+
+   bit_count