issue_comments: 1434780029
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| html_url | issue_url | id | node_id | user | created_at | updated_at | author_association | body | reactions | performed_via_github_app | issue |
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| https://github.com/pydata/xarray/issues/4079#issuecomment-1434780029 | https://api.github.com/repos/pydata/xarray/issues/4079 | 1434780029 | IC_kwDOAMm_X85VhQF9 | 90008 | 2023-02-17T15:08:50Z | 2023-02-17T15:08:50Z | CONTRIBUTOR | I know it is "stale" but aligning to these "surprise dimensions" creates "late stage" bugs that are hard to pinpoint. I'm not sure if it is possible to mark these dimensions as "unnamed" and as such, they should be "merged" into new "unnamed" dimensions that the user isn't tracking at this point in time. Our workaround have included calling these dimensions something related to the datarray ```python import xarray as xr d1 = xr.DataArray(data=[1, 2]) assert 'dim_0' in d1.dims d2 = xr.DataArray(data=[1, 2, 3]) assert 'dim_0' in d2.dims xr.Dataset({'d1': d1, 'd2': d2}) ``` Stack trace``` --------------------------------------------------------------------------- ValueError Traceback (most recent call last) Cell In[2], line 7 4 d2 = xr.DataArray(data=[1, 2, 3]) 5 assert 'dim_0' in d2.dims ----> 7 xr.Dataset({'d1': d1, 'd2': d2}) File ~/mambaforge/envs/dev/lib/python3.9/site-packages/xarray/core/dataset.py:612, in Dataset.__init__(self, data_vars, coords, attrs) 609 if isinstance(coords, Dataset): 610 coords = coords.variables --> 612 variables, coord_names, dims, indexes, _ = merge_data_and_coords( 613 data_vars, coords, compat="broadcast_equals" 614 ) 616 self._attrs = dict(attrs) if attrs is not None else None 617 self._close = None File ~/mambaforge/envs/dev/lib/python3.9/site-packages/xarray/core/merge.py:564, in merge_data_and_coords(data_vars, coords, compat, join) 562 objects = [data_vars, coords] 563 explicit_coords = coords.keys() --> 564 return merge_core( 565 objects, 566 compat, 567 join, 568 explicit_coords=explicit_coords, 569 indexes=Indexes(indexes, coords), 570 ) File ~/mambaforge/envs/dev/lib/python3.9/site-packages/xarray/core/merge.py:741, in merge_core(objects, compat, join, combine_attrs, priority_arg, explicit_coords, indexes, fill_value) 738 _assert_compat_valid(compat) 740 coerced = coerce_pandas_values(objects) --> 741 aligned = deep_align( 742 coerced, join=join, copy=False, indexes=indexes, fill_value=fill_value 743 ) 744 collected = collect_variables_and_indexes(aligned, indexes=indexes) 745 prioritized = _get_priority_vars_and_indexes(aligned, priority_arg, compat=compat) File ~/mambaforge/envs/dev/lib/python3.9/site-packages/xarray/core/alignment.py:848, in deep_align(objects, join, copy, indexes, exclude, raise_on_invalid, fill_value) 845 else: 846 out.append(variables) --> 848 aligned = align( 849 *targets, 850 join=join, 851 copy=copy, 852 indexes=indexes, 853 exclude=exclude, 854 fill_value=fill_value, 855 ) 857 for position, key, aligned_obj in zip(positions, keys, aligned): 858 if key is no_key: File ~/mambaforge/envs/dev/lib/python3.9/site-packages/xarray/core/alignment.py:785, in align(join, copy, indexes, exclude, fill_value, *objects) 589 """ 590 Given any number of Dataset and/or DataArray objects, returns new 591 objects with aligned indexes and dimension sizes. (...) 775 776 """ 777 aligner = Aligner( 778 objects, 779 join=join, (...) 783 fill_value=fill_value, 784 ) --> 785 aligner.align() 786 return aligner.results File ~/mambaforge/envs/dev/lib/python3.9/site-packages/xarray/core/alignment.py:573, in Aligner.align(self) 571 self.assert_no_index_conflict() 572 self.align_indexes() --> 573 self.assert_unindexed_dim_sizes_equal() 575 if self.join == "override": 576 self.override_indexes() File ~/mambaforge/envs/dev/lib/python3.9/site-packages/xarray/core/alignment.py:472, in Aligner.assert_unindexed_dim_sizes_equal(self) 470 add_err_msg = "" 471 if len(sizes) > 1: --> 472 raise ValueError( 473 f"cannot reindex or align along dimension {dim!r} " 474 f"because of conflicting dimension sizes: {sizes!r}" + add_err_msg 475 ) ValueError: cannot reindex or align along dimension 'dim_0' because of conflicting dimension sizes: {2, 3} ```cc: @claydugo |
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