fix matplotlib errors for single level discrete colormaps (pydata#4256)

* duplicate the level if a single level was passed * don't handle scalars it seems these will never be passed at that level * [test-upstream] [skip-ci]
dcherian · Mar 7, 2021 · 54d5817 · 54d5817
1 parent b610a3c
commit 54d5817
Showing 1 changed file with 3 additions and 0 deletions.
diff --git a/xarray/plot/utils.py b/xarray/plot/utils.py
@@ -60,6 +60,9 @@ def _build_discrete_cmap(cmap, levels, extend, filled):
     """
     import matplotlib as mpl
 
+    if len(levels) == 1:
+        levels = [levels[0], levels[0]]
+
     if not filled:
         # non-filled contour plots
         extend = "max"