From 9aea5a42bd8b74ffd2472d1e6c7761daca868a4a Mon Sep 17 00:00:00 2001
From: Eric Wieser <wieser.eric@gmail.com>
Date: Tue, 18 Jul 2017 00:42:15 +0100
Subject: BUG: Make transpose and diagonal masks be views

Fixes gh-8506 and fixes gh-7483
---
 numpy/ma/core.py | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

(limited to 'numpy/ma/core.py')

diff --git a/numpy/ma/core.py b/numpy/ma/core.py
index deddacfdc..0035cd9f7 100644
--- a/numpy/ma/core.py
+++ b/numpy/ma/core.py
@@ -2558,7 +2558,8 @@ def _arraymethod(funcname, onmask=True):
         if not onmask:
             result.__setmask__(mask)
         elif mask is not nomask:
-            result.__setmask__(getattr(mask, funcname)(*args, **params))
+            # __setmask__ makes a copy, which we don't want
+            result._mask = getattr(mask, funcname)(*args, **params)
         return result
     methdoc = getattr(ndarray, funcname, None) or getattr(np, funcname, None)
     if methdoc is not None:
-- 
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