ENH: Adding np.quantile() and np.nanquantile(). #10199

1 files changed, 22 insertions, 0 deletions

diff --git a/numpy/lib/tests/test_function_base.py b/numpy/lib/tests/test_function_base.py
index 0a4c7c370..280715bc3 100644
--- a/numpy/lib/tests/test_function_base.py
+++ b/numpy/lib/tests/test_function_base.py
@@ -2719,6 +2719,28 @@ class TestPercentile(object):
                 a, [0.3, 0.6], (0, 2), interpolation='nearest'), b)
 
 
+class TestQuantile(object):
+    # most of this is already tested by TestPercentile
+
+    def test_basic(self):
+        x = np.arange(8) * 0.5
+        assert_equal(np.quantile(x, 0), 0.)
+        assert_equal(np.quantile(x, 1), 3.5)
+        assert_equal(np.quantile(x, 0.5), 1.75)
+
+    def test_no_p_overwrite(self):
+        # this is worth retesting, beause quantile does not make a copy
+        p0 = np.array([0, 0.75, 0.25, 0.5, 1.0])
+        p = p0.copy()
+        np.quantile(np.arange(100.), p, interpolation="midpoint")
+        assert_array_equal(p, p0)
+
+        p0 = p0.tolist()
+        p = p.tolist()
+        np.quantile(np.arange(100.), p, interpolation="midpoint")
+        assert_array_equal(p, p0)
+
+
 class TestMedian(object):
 
     def test_basic(self):