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/1005#issuecomment-447043519,https://api.github.com/repos/pydata/xarray/issues/1005,447043519,MDEyOklzc3VlQ29tbWVudDQ0NzA0MzUxOQ==,1217238,2018-12-13T16:59:55Z,2018-12-13T16:59:55Z,MEMBER,"Something like this might work for you:
```python
import xarray
import numpy as np

def add_cyclic_point(xarray_obj, dim, period=None):
  if period is None:
    period = xarray_obj.sizes[dim] / xarray_obj.coords[dim][:2].diff(dim).item()
  first_point = xarray_obj.isel({dim: slice(1)})
  first_point.coords[dim] = first_point.coords[dim]+period
  return xarray.concat([xarray_obj, first_point], dim=dim)
```

Example usage:
```
>>> ds = xarray.Dataset({'foo': ('x', np.arange(10))}, {'x': np.arange(10)})
>>> add_cyclic_point(ds, dim='x', period=10)
<xarray.Dataset>
Dimensions:  (x: 11)
Coordinates:
  * x        (x) int64 0 1 2 3 4 5 6 7 8 9 10
Data variables:
    foo      (x) int64 0 1 2 3 4 5 6 7 8 9 0
```

It would also make sense to add a more generic `.pad()` method, which this function would be a special case of (if `mode='wrap'`).","{""total_count"": 1, ""+1"": 1, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",,177484162
https://github.com/pydata/xarray/issues/1005#issuecomment-248151652,https://api.github.com/repos/pydata/xarray/issues/1005,248151652,MDEyOklzc3VlQ29tbWVudDI0ODE1MTY1Mg==,1217238,2016-09-19T22:49:38Z,2016-09-19T22:49:38Z,MEMBER,"Note that `xarray.apply` doesn't solve this _yet_, but hopefully it will soon. I'll update this issue when it does.
","{""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",,177484162
https://github.com/pydata/xarray/issues/1005#issuecomment-248045734,https://api.github.com/repos/pydata/xarray/issues/1005,248045734,MDEyOklzc3VlQ29tbWVudDI0ODA0NTczNA==,1217238,2016-09-19T16:35:42Z,2016-09-19T16:35:42Z,MEMBER,"> Do I need to create a new Xarray DataArray from the output of add_cyclic_point?

Yes, that would be my suggested approach.

This would be a good use case for `xarray.apply` (#964).
","{""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",,177484162