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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
1599044689 I_kwDOAMm_X85fT3xR 7558 shift time using frequency strings dcherian 2448579 open 0     2 2023-02-24T17:35:52Z 2023-02-26T15:08:13Z   MEMBER      

Discussed in https://github.com/pydata/xarray/discussions/7557

<sup>Originally posted by **arfriedman** February 24, 2023</sup> Hi, In addition to integer offsets, I was wondering if it is possible to [shift](https://docs.xarray.dev/en/stable/generated/xarray.Variable.shift.html) a variable by a specific time frequency interval as in [pandas](https://pandas.pydata.org/docs/reference/api/pandas.Series.shift.html). For example, something like: ``` import xarray as xr ds = xr.tutorial.load_dataset("air_temperature") air = ds["air"] air.shift(time="1D") ``` Otherwise, is there another xarray function or recommended approach for this type of operation?
 
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     xarray 13221727 issue
1599056009 I_kwDOAMm_X85fT6iJ 7559 Support specifying chunk sizes using labels (e.g. frequency string) dcherian 2448579 open 0     2 2023-02-24T17:44:03Z 2023-02-25T03:46:49Z   MEMBER      

Is your feature request related to a problem?

dask.dataframe supports repartitioning or rechunking using a frequency string (freq kwarg).

I think this would be a useful addition to .chunk. It would help with some groupby problems (as suggested in this comment) and generally make a few problems amenable to blockwise/map_blocks solutions.

Describe the solution you'd like

  1. One solution is to allow .chunk(lon=5, time="MS"). There is some ugliness in that this syntax mixes up integer index values (lon=5) and a label-based frequency string time="MS"
  2. So perhaps a second method chunk_by_labels would be useful where chunk_by_labels(lon=5, time="MS") would rechunk the data so that a single chunk contains 5° of longitude points and a month of time. Alternative this could be .chunk(lon=5, time="MS", by="labels")

Describe alternatives you've considered

Have the user do this manually but that's kind of annoying, and a bit advanced.

Additional context

No response

 
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     xarray 13221727 issue

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