issues: 743165216

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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
743165216 MDU6SXNzdWU3NDMxNjUyMTY= 4587 ffill with datetime64 errors 15331990 open 0     1 2020-11-15T02:38:39Z 2020-11-15T14:23:19Z   CONTRIBUTOR      

import xarray as xr import pandas as pd xr.DataArray(pd.date_range('2020-01-01', '2020-02-01').tolist() + [pd.NaT]).ffill('dim_0')

<xarray.DataArray (dim_0: 33)> array(['2020-01-01T00:00:00.000000000', '2020-01-02T00:00:00.000000000', '2020-01-03T00:00:00.000000000', '2020-01-04T00:00:00.000000000', '2020-01-05T00:00:00.000000000', '2020-01-06T00:00:00.000000000', '2020-01-07T00:00:00.000000000', '2020-01-08T00:00:00.000000000', '2020-01-09T00:00:00.000000000', '2020-01-10T00:00:00.000000000', '2020-01-11T00:00:00.000000000', '2020-01-12T00:00:00.000000000', '2020-01-13T00:00:00.000000000', '2020-01-14T00:00:00.000000000', '2020-01-15T00:00:00.000000000', '2020-01-16T00:00:00.000000000', '2020-01-17T00:00:00.000000000', '2020-01-18T00:00:00.000000000', '2020-01-19T00:00:00.000000000', '2020-01-20T00:00:00.000000000', '2020-01-21T00:00:00.000000000', '2020-01-22T00:00:00.000000000', '2020-01-23T00:00:00.000000000', '2020-01-24T00:00:00.000000000', '2020-01-25T00:00:00.000000000', '2020-01-26T00:00:00.000000000', '2020-01-27T00:00:00.000000000', '2020-01-28T00:00:00.000000000', '2020-01-29T00:00:00.000000000', '2020-01-30T00:00:00.000000000', '2020-01-31T00:00:00.000000000', '2020-02-01T00:00:00.000000000', 'NaT'], dtype='datetime64[ns]') Dimensions without coordinates: dim_0

```

~/anaconda3/envs/py3/lib/python3.7/site-packages/xarray/core/computation.py in apply_variable_ufunc(func, signature, exclude_dims, dask, output_dtypes, vectorize, keep_attrs, dask_gufunc_kwargs, args) 698 ) 699 --> 700 result_data = func(input_data) 701 702 if signature.num_outputs == 1:

~/anaconda3/envs/py3/lib/python3.7/site-packages/bottleneck/slow/nonreduce_axis.py in push(a, n, axis) 49 elif ndim == 0: 50 return y ---> 51 fidx = ~np.isnan(y) 52 recent = np.empty(y.shape[:-1]) 53 count = np.empty(y.shape[:-1])

TypeError: ufunc 'isnan' not supported for the input types, and the inputs could not be safely coerced to any supported types according to the casting rule ''safe'' ```

 
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     13221727 issue

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