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  • shoyer · 3 ✖
id html_url issue_url node_id user created_at updated_at ▲ author_association body reactions performed_via_github_app issue
249390682 https://github.com/pydata/xarray/issues/748#issuecomment-249390682 https://api.github.com/repos/pydata/xarray/issues/748 MDEyOklzc3VlQ29tbWVudDI0OTM5MDY4Mg== shoyer 1217238 2016-09-24T22:16:17Z 2016-09-24T22:16:29Z MEMBER

@alexamici Something else must have gone wrong here -- your example works for me:

``` In [9]: dataset = xr.Dataset({'data': np.zeros((2,), dtype='complex128')})

In [10]: dataset Out[10]: <xarray.Dataset> Dimensions: (data: 2) Coordinates: * data (data) complex128 0j 0j Data variables: empty

In [11]: dataset.to_netcdf('tmp.nc', engine='h5netcdf') ```

Maybe you need to update to a newer version of h5py? (Just a guess)

 
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   IO fails with complex datatypes 131972229
182943474 https://github.com/pydata/xarray/issues/748#issuecomment-182943474 https://api.github.com/repos/pydata/xarray/issues/748 MDEyOklzc3VlQ29tbWVudDE4Mjk0MzQ3NA== shoyer 1217238 2016-02-11T16:28:04Z 2016-02-11T16:28:04Z MEMBER

OK, I can reproduce this. The issue seems to be that xarray uses the netCDF4 package as the default backend for reading netCDF4/HDF5 files, and netCDF4 seems to silently drop these variables with a compound dtype, even though allegedly it supports them.

The work around is to use engine='h5netcdf' explicitly when opening these netCDF files:

``` In [35]: ntwk_opened = xr.open_dataset('ring_slot.nc', engine='h5netcdf')

In [36]: ntwk_opened Out[36]: <xarray.Dataset> Dimensions: (f: 201, m: 2, n: 2) Coordinates: * f (f) float64 75.0 75.17 75.35 75.53 75.7 75.88 76.05 76.22 76.4 ... * m (m) int64 0 1 * n (n) int64 0 1 Data variables: s (f, m, n) complex128 (-0.503723180993+0.457844804761j) ... z0 (f, m) complex128 (50+0j) (50+0j) (50+0j) (50+0j) (50+0j) ... Attributes: name: ring slot ```

 
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   IO fails with complex datatypes 131972229
181438176 https://github.com/pydata/xarray/issues/748#issuecomment-181438176 https://api.github.com/repos/pydata/xarray/issues/748 MDEyOklzc3VlQ29tbWVudDE4MTQzODE3Ng== shoyer 1217238 2016-02-08T15:57:02Z 2016-02-08T15:57:02Z MEMBER

This looks bad! I was pretty sure we had tested this with h5netcdf. I'll take a look later... what version of h5py are you using?

 
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   IO fails with complex datatypes 131972229

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