[python-dtcwt] 222/497: tests/util.py: add a percentile-based 'nearly equal' test

[Ghislain Vaillant]

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ghisvail-guest pushed a commit to branch debian/sid
in repository python-dtcwt.

commit 576b8855f308a85584572985aeb9e66f0da9f6f8
Author: Rich Wareham <rjw57 at cam.ac.uk>
Date:   Wed Dec 4 15:28:40 2013 +0000

    tests/util.py: add a percentile-based 'nearly equal' test
---
 tests/util.py | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/tests/util.py b/tests/util.py
index 1999603..0c86b49 100644
--- a/tests/util.py
+++ b/tests/util.py
@@ -15,6 +15,15 @@ def assert_almost_equal(a, b, tolerance=TOLERANCE):
             'Arrays differ by a maximum of {0} which is greater than the tolerance of {1}'.
             format(md, tolerance))
 
+def assert_percentile_almost_equal(a, b, percentile=90, tolerance=TOLERANCE):
+    md = np.percentile(np.abs(a-b), percentile)
+    if md <= tolerance:
+        return
+
+    raise AssertionError(
+            'Arrays differ by a maximum of {0} in the {2}th percentile which is greater than the tolerance of {1}'.
+            format(md, tolerance, percentile))
+
 def _mean(a, axis=None, *args, **kwargs):
     """Equivalent to numpy.mean except that the axis along which the mean is taken is not removed."""
 

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