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id node_id number title user state locked assignee milestone comments created_at updated_at ▲ closed_at author_association active_lock_reason draft pull_request body reactions performed_via_github_app state_reason repo type
677773328 MDU6SXNzdWU2Nzc3NzMzMjg= 4338 Combining tiled data sets in xarray nicholaskgeorge 56926399 closed 0     4 2020-08-12T15:12:39Z 2020-08-13T12:04:11Z 2020-08-12T22:50:33Z NONE      

I'm working on a project where I need to combine different sets of geographic image tiles into one large tile in Xarray. I am running into an issue. I've made a simplified example bellow.

```python square1 = xr.DataArray(name="box1", data=np.random.randint(5, size=(3, 2)), coords=[("x", [0,1,2]),('y',[0,1])]) square2 = xr.DataArray(name="box2", data=np.random.randint(5, size=(3, 2)), coords=[("x", [2,3,4]),('y',[0,1])]) square3 = xr.DataArray(name="box3", data=np.random.randint(5, size=(3, 2)), coords=[("x", [0,1,2]),('y',[2,3])]) square4 = xr.DataArray(name="box4", data=np.random.randint(5, size=(3, 2)), coords=[("x", [2,3,4]),('y',[2,3])])

combineddata = xr.combine_by_coords([square1,square2,square3,square4]) ``` I thought this is all you need to do it but I get this error

```python

ValueError Traceback (most recent call last) <ipython-input-57-fc5add80d55a> in <module> ----> 1 xr.combine_by_coords([square1,square2,square3,square4])

~/my-conda-envs/dem/lib/python3.8/site-packages/xarray/core/combine.py in combine_by_coords(datasets, compat, data_vars, coords, fill_value, join, combine_attrs) 713 714 # Group by data vars --> 715 sorted_datasets = sorted(datasets, key=vars_as_keys) 716 grouped_by_vars = itertools.groupby(sorted_datasets, key=vars_as_keys) 717

~/my-conda-envs/dem/lib/python3.8/site-packages/xarray/core/combine.py in vars_as_keys(ds) 502 503 def vars_as_keys(ds): --> 504 return tuple(sorted(ds)) 505 506

~/my-conda-envs/dem/lib/python3.8/site-packages/xarray/core/common.py in bool(self) 118 119 def bool(self: Any) -> bool: --> 120 return bool(self.values) 121 122 def float(self: Any) -> float:

ValueError: The truth value of an array with more than one element is ambiguous. Use a.any() or a.all() ``` I am not really sure why this is not working. 

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   completed xarray 13221727 issue

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