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-rw-r--r--numpy/lib/function_base.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/numpy/lib/function_base.py b/numpy/lib/function_base.py
index b616011d1..32c999dfc 100644
--- a/numpy/lib/function_base.py
+++ b/numpy/lib/function_base.py
@@ -1701,7 +1701,7 @@ def gradient(f, *varargs, **kwargs):
if len(distances) != f.shape[axes[i]]:
raise ValueError("when 1d, distances must match "
"the length of the corresponding dimension")
- diffx = np.diff(dx[i])
+ diffx = np.diff(distances)
# if distances are constant reduce to the scalar case
# since it brings a consistent speedup
if (diffx == diffx[0]).all():