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fix da.pad example for numpy 1.20 #4865

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Merged
merged 3 commits into from
Feb 7, 2021
Merged

fix da.pad example for numpy 1.20 #4865

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91da5bb
fix da.pad example for numpy 1.20
mathause Feb 5, 2021
21ad6d2
update docstring
mathause Feb 7, 2021
1c181f9
add tests
mathause Feb 7, 2021
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23 changes: 11 additions & 12 deletions xarray/core/dataarray.py
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Original file line number Diff line number Diff line change
Expand Up @@ -3851,9 +3851,8 @@ def pad(

Notes
-----
By default when ``mode="constant"`` and ``constant_values=None``, integer types will be
promoted to ``float`` and padded with ``np.nan``. To avoid type promotion
specify ``constant_values=np.nan``
For ``mode="constant"`` and ``constant_values=None``, integer types will be
promoted to ``float`` and padded with ``np.nan``.

Examples
--------
Expand All @@ -3880,16 +3879,16 @@ def pad(
* x (x) float64 nan 0.0 1.0 nan
* y (y) int64 10 20 30 40
z (x) float64 nan 100.0 200.0 nan
>>> da.pad(x=1, constant_values=np.nan)

Careful, ``constant_values`` can be coerced to the data type of the array which
may lead to a loss of precision:

>>> da.pad(x=1, constant_values=1.23456789)
<xarray.DataArray (x: 4, y: 4)>
array([[-9223372036854775808, -9223372036854775808, -9223372036854775808,
-9223372036854775808],
[ 0, 1, 2,
3],
[ 10, 11, 12,
13],
[-9223372036854775808, -9223372036854775808, -9223372036854775808,
-9223372036854775808]])
array([[ 1, 1, 1, 1],
[ 0, 1, 2, 3],
[10, 11, 12, 13],
[ 1, 1, 1, 1]])
Coordinates:
* x (x) float64 nan 0.0 1.0 nan
* y (y) int64 10 20 30 40
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