FIX: regression

astromancer · astromancer · commit 55a9da449df8 · 2024-06-14T11:43:29.000+02:00
diff --git a/lib/matplotlib/cbook.py b/lib/matplotlib/cbook.py
@@ -1545,6 +1545,10 @@ def hexbin(x, y, C=None, gridsize=100,
         ty = np.log10(ty)
     if extent is not None:
         xmin, xmax, ymin, ymax = extent
+        if xmin > xmax:
+            raise ValueError("In extent, xmax must be greater than xmin")
+        if ymin > ymax:
+            raise ValueError("In extent, ymax must be greater than ymin")
     else:
         xmin, xmax = (tx.min(), tx.max()) if len(x) else (0, 1)
         ymin, ymax = (ty.min(), ty.max()) if len(y) else (0, 1)
@@ -1600,7 +1604,7 @@ def hexbin(x, y, C=None, gridsize=100,
             else:
                 Cs_at_i2[i2[i]].append(C[i])
         if mincnt is None:
-            mincnt = 0
+            mincnt = 1
         accum = np.array(
             [reduce_C_function(acc) if len(acc) >= mincnt else np.nan
                 for Cs_at_i in [Cs_at_i1, Cs_at_i2]
