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
502060636,MDU6SXNzdWU1MDIwNjA2MzY=,3368,Shift DataArray along a coordinate for different values of each element of another coordinate,49461634,closed,0,,,1,2019-10-03T13:17:10Z,2020-03-29T14:18:11Z,2020-03-29T14:16:43Z,NONE,,,,"#### MCVE Code Sample
<!-- In order for the maintainers to efficiently understand and prioritize issues, we ask you post a ""Minimal, Complete and Verifiable Example"" (MCVE): http://matthewrocklin.com/blog/work/2018/02/28/minimal-bug-reports -->

```python
# Your code here

Original_DataArray =  <xarray.DataArray 'Conexões Domésticas e Piscinas' (projetos_resi: 9, res_segmentacao: 21, time: 133, bands: 10)>

Shift_Map = <xarray.DataArray 'Anos por Desconto' (res_segmentacao: 21)>
array([ 0,  0,  0, 24,  0, 24,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0, 24, 36,
       60, 36,  0])

#""Multi"" Shift Function

def _fn(dataArray,over_shift_index,multi_shift_index,shift_map,initialValues=None):
    """"""    
        -dataArray: dataarray to shift
        -over_shift_index: index over apply shit of dataarray 
        -multi_shift_index: index with the elements to apply a different value shift
        -shift_map: datarray indexed by multi_shift_index with the values to shift for each element
    """"""

    _da = dataArray.copy()
    _shift_map = shift_map.astype(int)
    
    for name, sl in _da.groupby(multi_shift_index.name):
        _shift = subscript(_shift_map, multi_shift_index, name ).values.tolist()
        _sl = sl.squeeze(multi_shift_index.name).shift(time = _shift)
    
        _dict = {multi_shift_index.name : name}
        _da.loc[_dict] = _sl
        

    return _da.fillna(0.)
```

#### Expected Output

Same estructure DataArray shifted along the ""time"" coordinate by a different value for each element of the ""res_segmentacao"" coordinate.

```python
exp_output= multidynamic( Original_DataArray , time, res_segmentacao, Shift_Map )
```

#### Problem Description

I´ve reached my objective but I wanted to consult if anyone had donde this in a more efficient way. Thanks!


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