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  • dcherian · 2 ✖

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  • netCDF + lazy backend: Error when sel is used with slice, reverse arrange · 2 ✖

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  • MEMBER · 2 ✖
id html_url issue_url node_id user created_at updated_at ▲ author_association body reactions performed_via_github_app issue
1118690026 https://github.com/pydata/xarray/issues/6560#issuecomment-1118690026 https://api.github.com/repos/pydata/xarray/issues/6560 IC_kwDOAMm_X85Crdrq dcherian 2448579 2022-05-05T15:21:22Z 2022-05-05T15:21:40Z MEMBER

OK it has to do with the lazy backend. Calling data_example.load() fixes things. @jesieleo in the mean time, if your data is small use load_dataset or load to fix it.

Though I still can't make a minimal example. The example below works fine.

python import numpy as np import xarray as xr ds = xr.Dataset( { "z": ( ("time", "isoBaricInhPa", "latitude", "longitude"), np.ones((1, 5, 721, 1440)), ) }, coords={"latitude": np.linspace(-90, 90, 721)}, ).to_netcdf("test.nc") ds = xr.open_dataset('test.nc') ds.isel(time=[0], isoBaricInhPa=1).z[:, ::10, :][:, ::-1, :]

 
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   netCDF + lazy backend: Error when sel is used with slice, reverse arrange 1222609313
1118682989 https://github.com/pydata/xarray/issues/6560#issuecomment-1118682989 https://api.github.com/repos/pydata/xarray/issues/6560 IC_kwDOAMm_X85Crb9t dcherian 2448579 2022-05-05T15:16:33Z 2022-05-05T15:16:52Z MEMBER

OK turns out my attempts at a minimal example didn't work.

There's some bug here (on xarray main) 1. the size of latitude is different in .sizes, .shape, .data.shape and 2. latitude really should be 73 elements. I don't see why a subsetting happens when slicing with ::-

@jesieleo here's how I tried to create a "minimal example"

``` python import xarray as xr import numpy as np

ds = xr.Dataset( { "z": ( ("time", "isoBaricInhPa", "latitude", "longitude"), np.ones((1, 5, 721, 1440)), # use numpy.ones to create array of same shape. ) }, coords={"latitude": np.linspace(-90, 90, 721)}, ) ds.isel(isoBaricInhPa=1).z[:, ::10, :][:, ::-1, :] ```

Though this doesn't replicate it!

 
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   netCDF + lazy backend: Error when sel is used with slice, reverse arrange 1222609313

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