Merge pull request #154 from dfm/infinite-loop

Fixing infinite loop

src/corner/core.py

@@ -568,6 +568,11 @@ def hist2d(
             "have no dynamic range. You could try using the "
             "'range' argument."
         )
+    if H.sum() == 0:
+        raise ValueError(
+            "It looks like the provided 'range' is not valid "
+            "or the sample is empty."
+        )
 
     if smooth is not None:
         if gaussian_filter is None:

tests/test_hist2d.py

@@ -131,3 +131,9 @@ def test_lowNfilled():
 )
 def test_lowNnofill():
     _run_hist2d("lowNnofill", N=20, no_fill_contours=True)
+
+
+def test_infinite_loop():
+    x, y = np.random.rand(2, 1000)
+    with pytest.raises(ValueError):
+        corner.hist2d(x, y, 20, range=[(0, 1), (2, 3)])