Add nonsingular handling for nans/infs

dstansby · dstansby · commit 79acf300b887 · 2018-09-26T10:20:52.000+01:00
diff --git a/lib/matplotlib/dates.py b/lib/matplotlib/dates.py
@@ -1228,6 +1228,8 @@ def tick_values(self, vmin, vmax):
         return self.get_locator(vmin, vmax).tick_values(vmin, vmax)
 
     def nonsingular(self, vmin, vmax):
+        if not np.isfinite(vmin) or not np.isfinite(vmax):
+            return 1, 2  # initial range, no data plotted yet
         # whatever is thrown at us, we can scale the unit.
         # But default nonsingular date plots at an ~4 year period.
         if vmin == vmax:
