html_url,issue_url,id,node_id,user,created_at,updated_at,author_association,body,reactions,performed_via_github_app,issue
https://github.com/pydata/xarray/issues/3954#issuecomment-1115437287,https://api.github.com/repos/pydata/xarray/issues/3954,1115437287,IC_kwDOAMm_X85CfDjn,26384082,2022-05-02T22:37:48Z,2022-05-02T22:37:48Z,NONE,"In order to maintain a list of currently relevant issues, we mark issues as stale after a period of inactivity

If this issue remains relevant, please comment here or remove the `stale` label; otherwise it will be marked as closed automatically
","{""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",,596249070
https://github.com/pydata/xarray/issues/3954#issuecomment-610715885,https://api.github.com/repos/pydata/xarray/issues/3954,610715885,MDEyOklzc3VlQ29tbWVudDYxMDcxNTg4NQ==,34353851,2020-04-08T02:25:34Z,2020-04-08T02:25:34Z,NONE,"import xarray as xr
import numpy as np

x = 2
y = 4
z = 3
data = np.arange(x*y*z).reshape(z, x, y)

# 3d array with coords
a = xr.DataArray(data, dims=['z', 'y', 'x'], coords={'z': np.arange(z)})

# 2d array without coords
b = xr.DataArray(np.arange(x*y).reshape(x, y)*1.5, dims=['y', 'x'])

# expand 2d to 3d

b = b.assign_coords({'z':3})

comb = xr.concat([a, b], dim='z')

perhaps you need another thing.
http://xarray.pydata.org/en/stable/generated/xarray.concat.html
** consist of variables and coordinates with matching shapes

if you compare your shape are differents a.shape and b.shape
Regards.
Javier Ruano.

El mié., 8 abr. 2020 a las 1:36, Xin Zhang (<notifications@github.com>)
escribió:

> The 3D array has three dims: z, y and x.
> The 2D array has two dims: y and x.
> When I try to concatenate them by expanding the 2D array with z dim,
> there's something wrong in _dataset_concat
> MCVE Code Sample
>
> import xarray as xrimport numpy as np
>
> x = 2
> y = 4
> z = 3
> data = np.arange(x*y*z).reshape(z, x, y)
> # 3d array with coords
> a = xr.DataArray(data, dims=['z', 'y', 'x'], coords={'z': np.arange(z)})
> # 2d array without coords
> b = xr.DataArray(np.arange(x*y).reshape(x, y)*1.5, dims=['y', 'x'])
> # expand 2d to 3d
> b = b.expand_dims('z')
> # concat
> comb = xr.concat([a, b], dim='z')
>
> Expected Output
>
> Same as np.concatenate:
>
> concat_array = np.concatenate((a, b))
> comb = xr.DataArray(concat_array, dims={'z', 'y', 'x'})
>
> <xarray.DataArray (z: 4, x: 2, y: 4)>
> array([[[ 0. ,  1. ,  2. ,  3. ],
>         [ 4. ,  5. ,  6. ,  7. ]],
>
>        [[ 8. ,  9. , 10. , 11. ],
>         [12. , 13. , 14. , 15. ]],
>
>        [[16. , 17. , 18. , 19. ],
>         [20. , 21. , 22. , 23. ]],
>
>        [[ 0. ,  1.5,  3. ,  4.5],
>         [ 6. ,  7.5,  9. , 10.5]]])
> Dimensions without coordinates: z, x, y
>
> Problem Description
>
>     comb = xr.concat([a, b], dim='z')
>   File ""E:\miniconda3\envs\satpy\lib\site-packages\xarray\core\concat.py"", line 135, in concat
>     return f(objs, dim, data_vars, coords, compat, positions, fill_value, join)
>   File ""E:\miniconda3\envs\satpy\lib\site-packages\xarray\core\concat.py"", line 455, in _dataarray_concat
>     join=join,
>   File ""E:\miniconda3\envs\satpy\lib\site-packages\xarray\core\concat.py"", line 395, in _dataset_concat
>     raise ValueError(""%r is not present in all datasets."" % k)
> ValueError: 'z' is not present in all datasets.
>
> If I change b = b.expand_dims('z') to b = b.expand_dims(z=3) as suggested
> by @dcherian <https://github.com/dcherian> , I still get the same error.
> Versions Output of `xr.show_versions()` INSTALLED VERSIONS
>
> commit: None
> python: 3.7.6 | packaged by conda-forge | (default, Jan 7 2020, 21:48:41)
> [MSC v.1916 64 bit (AMD64)]
> python-bits: 64
> OS: Windows
> OS-release: 10
> machine: AMD64
> processor: Intel64 Family 6 Model 158 Stepping 9, GenuineIntel
> byteorder: little
> LC_ALL: None
> LANG: None
> LOCALE: None.None
> libhdf5: None
> libnetcdf: None
>
> xarray: 0.15.1
> pandas: 1.0.3
> numpy: 1.18.1
> scipy: 1.4.1
> netCDF4: None
> pydap: None
> h5netcdf: None
> h5py: None
> Nio: None
> zarr: None
> cftime: 1.1.1.2
> nc_time_axis: None
> PseudoNetCDF: None
> rasterio: 1.1.3
> cfgrib: None
> iris: None
> bottleneck: None
> dask: 2.10.1
> distributed: 2.14.0
> matplotlib: 3.2.1
> cartopy: 0.17.0
> seaborn: 0.10.0
> numbagg: None
> setuptools: 46.1.3.post20200325
> pip: 20.0.2
> conda: None
> pytest: None
> IPython: 7.13.0
> sphinx: 2.4.4
>
> —
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> Reply to this email directly, view it on GitHub
> <https://github.com/pydata/xarray/issues/3954>, or unsubscribe
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>
","{""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",,596249070
https://github.com/pydata/xarray/issues/3954#issuecomment-610707081,https://api.github.com/repos/pydata/xarray/issues/3954,610707081,MDEyOklzc3VlQ29tbWVudDYxMDcwNzA4MQ==,30388627,2020-04-08T01:52:30Z,2020-04-08T01:52:30Z,NONE,"Thanks, @fujiisoup .
@dcherian decided to improve the error message later. So, I will leave this open.","{""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",,596249070