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Interp na warning #9813

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Interp na warning #9813

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7400d26
interpolation with nans warning
hollymandel Nov 24, 2024
7cfa6ac
test modification
hollymandel Nov 24, 2024
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6 changes: 6 additions & 0 deletions xarray/core/dataset.py
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Original file line number Diff line number Diff line change
Expand Up @@ -4184,6 +4184,12 @@ def _validate_interp_indexer(x, new_x):
variables: dict[Hashable, Variable] = {}
reindex: bool = False
for name, var in obj._variables.items():
if var.isnull().any():
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@dcherian dcherian Dec 2, 2024

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ah we can't do this really. I thought the behaviour stemmed from NaNs in the coordinate. Scanning the whole array like this is going to be expensive in many cases.

emit_user_level_warning(
"Interpolation behavior with NaNs is inconsistent. Consider using"
" .dropna() or .interpna()."
)

if name in indexers:
continue

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4 changes: 3 additions & 1 deletion xarray/tests/test_interp.py
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Expand Up @@ -496,7 +496,9 @@ def test_nans(use_dask: bool) -> None:
pytest.skip("dask is not installed in the environment.")
da = da.chunk()

actual = da.interp(x=[0.5, 1.5])
with pytest.warns(UserWarning, match=r"^Interpolation behavior"):
actual = da.interp(x=[0.5, 1.5])

# not all values are nan
assert actual.count() > 0

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