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  • raybellwaves · 2 ✖

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  • Rolling mean of dask array conflicting sizes for data and coordinate in rolling operation · 2 ✖

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  • CONTRIBUTOR · 2 ✖
id html_url issue_url node_id user created_at updated_at ▲ author_association body reactions performed_via_github_app issue
388489805 https://github.com/pydata/xarray/issues/2113#issuecomment-388489805 https://api.github.com/repos/pydata/xarray/issues/2113 MDEyOklzc3VlQ29tbWVudDM4ODQ4OTgwNQ== raybellwaves 17162724 2018-05-11T21:25:32Z 2018-05-11T21:25:50Z CONTRIBUTOR

I realized there with an issue before that in without center=True it doesn't raise an issue but it returns rubbish:

``` import xarray as xr import numpy as np

a = xr.DataArray(np.arange(1,4), coords=[np.arange(1,4)], dims='x') print(a.rolling(x=3, center=True).mean()) Out[2]: <xarray.DataArray (x: 3)> array([ nan, 2., nan]) Coordinates: * x (x) int64 1 2 3 print(a.chunk().rolling(x=3).mean().values) Out[3]: array([ -6.14891469e+18, -9.22337204e+18, -1.22978294e+19]) ```

The culprit lies in a dask function https://github.com/pydata/xarray/blob/6d8ac11ca0a785a6fe176eeca9b735c321a35527/xarray/core/dask_array_ops.py#L24

Not sure if this is an issue with the function or the way the data is going into the function.

For the center=True issue: https://github.com/pydata/xarray/blob/6d8ac11ca0a785a6fe176eeca9b735c321a35527/xarray/core/rolling.py#L308 is slicing the data.

 
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   Rolling mean of dask array conflicting sizes for data and coordinate in rolling operation 321917084
388042273 https://github.com/pydata/xarray/issues/2113#issuecomment-388042273 https://api.github.com/repos/pydata/xarray/issues/2113 MDEyOklzc3VlQ29tbWVudDM4ODA0MjI3Mw== raybellwaves 17162724 2018-05-10T12:43:18Z 2018-05-10T12:43:18Z CONTRIBUTOR

Probably isn't a good first issue but I wouldn't like to spend some time on this. Welcome to suggest places to look and things to try.

 
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   Rolling mean of dask array conflicting sizes for data and coordinate in rolling operation 321917084

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