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Raise ValueError in _get_ordered_vertices() with "mixed" order #595

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Raise ValueError in _get_ordered_vertices() with "mixed" order #595

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15c709e
Raise a ValueError in `_get_ordered_vertices()` with `"mixed"` core d…
tomvothecoder Sep 18, 2025
1a5eb22
Replace ValueError with NotImplementedError
tomvothecoder Sep 24, 2025
bde699c
[pre-commit.ci] auto fixes from pre-commit.com hooks
pre-commit-ci[bot] Sep 24, 2025
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6 changes: 6 additions & 0 deletions cf_xarray/helpers.py
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Original file line number Diff line number Diff line change
Expand Up @@ -338,6 +338,12 @@ def _get_ordered_vertices(
elif order == "descending":
endpoints = np.maximum(bounds[..., :, 0], bounds[..., :, 1])
last_endpoint = np.minimum(bounds[..., -1, 0], bounds[..., -1, 1])
else:
raise NotImplementedError(
f"Cannot determine vertices for non-monotonic bounds with {order} core "
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Hey @malmans2, I addressed your comment here. This PR is ready for another review.

The new else statement will catch any order that is not "ascending" or "descending". I kept the same error message (beside specifying the order value) because it should be helpful for the user.

"dimension orders. Try normalizing the coordinates to a monotonic "
"convention and try again."
)

vertices = np.concatenate(
[endpoints, np.expand_dims(last_endpoint, axis=-1)], axis=-1
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