BUG: Return scalars from ufunclike objects

No need to reinvent the wheel here - the ufunc machinery will handle the out arguments

Fixes #8993

1 files changed, 25 insertions, 0 deletions

diff --git a/numpy/lib/tests/test_ufunclike.py b/numpy/lib/tests/test_ufunclike.py
index 2f671739e..0b152540f 100644
--- a/numpy/lib/tests/test_ufunclike.py
+++ b/numpy/lib/tests/test_ufunclike.py
@@ -1,5 +1,6 @@
 from __future__ import division, absolute_import, print_function
 
+import numpy as np
 import numpy.core as nx
 import numpy.lib.ufunclike as ufl
 from numpy.testing import (
@@ -62,11 +63,35 @@ class TestUfunclike(TestCase):
         assert_(isinstance(f, MyArray))
         assert_equal(f.metadata, 'foo')
 
+        # check 0d arrays don't decay to scalars
+        m0d = m[0,...]
+        m0d.metadata = 'bar'
+        f0d = ufl.fix(m0d)
+        assert_(isinstance(f0d, MyArray))
+        assert_equal(f0d.metadata, 'bar')
+
     def test_deprecated(self):
         # NumPy 1.13.0, 2017-04-26
         assert_warns(DeprecationWarning, ufl.fix, [1, 2], y=nx.empty(2))
         assert_warns(DeprecationWarning, ufl.isposinf, [1, 2], y=nx.empty(2))
         assert_warns(DeprecationWarning, ufl.isneginf, [1, 2], y=nx.empty(2))
 
+    def test_scalar(self):
+        x = np.inf
+        actual = np.isposinf(x)
+        expected = np.True_
+        assert_equal(actual, expected)
+        assert_equal(type(actual), type(expected))
+
+        x = -3.4
+        actual = np.fix(x)
+        expected = np.float64(-3.0)
+        assert_equal(actual, expected)
+        assert_equal(type(actual), type(expected))
+
+        out = np.array(0.0)
+        actual = np.fix(x, out=out)
+        assert_(actual is out)
+
 if __name__ == "__main__":
     run_module_suite()