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-rw-r--r--series_expansion.py6
1 files changed, 6 insertions, 0 deletions
diff --git a/series_expansion.py b/series_expansion.py
index edee84e..76adc30 100644
--- a/series_expansion.py
+++ b/series_expansion.py
@@ -44,6 +44,12 @@ class SeriesExpansion(object):
except (TypeError, IndexError):
coords = [coords]
+ if diff_order is not None:
+ try:
+ diff_order[0]
+ except (TypeError, IndexError):
+ diff_order = [diff_order]
+
if diff_order is None:
diff_order = [0] * len(coords)