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  • chuaxr · 1 ✖

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  • Example on using `preprocess` with `mfdataset` · 1 ✖

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id html_url issue_url node_id user created_at updated_at ▲ author_association body reactions performed_via_github_app issue
1062761948 https://github.com/pydata/xarray/issues/2313#issuecomment-1062761948 https://api.github.com/repos/pydata/xarray/issues/2313 IC_kwDOAMm_X84_WHXc chuaxr 30007270 2022-03-09T10:13:09Z 2022-03-09T10:13:09Z NONE

Seconding @dcherian's comment in #4901 on an example for .encoding['source']. Working off @raybellwaves' example, something like this would have been useful to me:

```

import xarray as xr import numpy as np model1 = xr.DataArray(np.arange(2), coords=[np.arange(2)], name="f") model1.to_dataset().to_netcdf("model1.nc") model2 = xr.DataArray(np.arange(2), coords=[np.arange(2)], name="f") model2.to_dataset().to_netcdf("model2.nc") ds = xr.open_mfdataset( ... ["model1.nc", "model2.nc"], ... preprocess=lambda ds: ds.expand_dims( ... {"model_name": [ds.encoding["source"].split("/")[-1].split(".")[0]]} ... ), ... ) ds <xarray.Dataset> Dimensions: (dim_0: 2, model_name: 2) Coordinates: * dim_0 (dim_0) int64 0 1 * model_name (model_name) object 'model1' 'model2' Data variables: f (model_name, dim_0) int64 dask.array<chunksize=(1, 2), meta=np.ndarray> ```

On that note, the example above seems to work with some slight changes: ```

import numpy as np import xarray as xr

f1 = xr.DataArray(np.arange(2), coords=[np.arange(2)], dims=["a"], name="f1") f1 = f1.assign_coords(t='t0') f1.to_dataset().to_netcdf("f1.nc")

f2 = xr.DataArray(np.arange(2), coords=[np.arange(2)], dims=["a"], name="f2") f2 = f2.assign_coords(t='t1') f2.to_dataset().to_netcdf("f2.nc")

Concat along t

def preprocess(ds): ... return ds.expand_dims("t") ...

ds = xr.open_mfdataset(["f1.nc", "f2.nc"], concat_dim="t", preprocess=preprocess) ds <xarray.Dataset> Dimensions: (a: 2, t: 2) Coordinates: * t (t) object 't0' 't1' * a (a) int64 0 1 Data variables: f1 (t, a) float64 dask.array<chunksize=(2, 2), meta=np.ndarray> f2 (t, a) float64 dask.array<chunksize=(2, 2), meta=np.ndarray> ```

 
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   Example on using `preprocess` with `mfdataset` 344614881

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