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Add note on diff's n differing from pandas #3822

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Mar 5, 2020
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Add note on diff's n differing from pandas #3822

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c55f021
note that n != periods in diff docstring
max-sixty Mar 4, 2020
69e4bf5
better wording based on feedback
max-sixty Mar 4, 2020
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6 changes: 6 additions & 0 deletions xarray/core/dataarray.py
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Expand Up @@ -2692,6 +2692,12 @@ def diff(self, dim: Hashable, n: int = 1, label: Hashable = "upper") -> "DataArr
difference : same type as caller
The n-th order finite difference of this object.

.. note::

`n` matches numpy's behavior and is different from pandas' similarly
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located `periods` argument


Examples
--------
>>> arr = xr.DataArray([5, 5, 6, 6], [[1, 2, 3, 4]], ['x'])
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5 changes: 5 additions & 0 deletions xarray/core/dataset.py
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Expand Up @@ -4879,6 +4879,11 @@ def diff(self, dim, n=1, label="upper"):
difference : same type as caller
The n-th order finite difference of this object.

.. note::

`n` matches numpy's behavior and is different from pandas' similarly
located `periods` argument

Examples
--------
>>> ds = xr.Dataset({'foo': ('x', [5, 5, 6, 6])})
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