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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
2252965835 I_kwDOAMm_X86GSYfL 8958 DataArray .rolling() unclear behaviour when center=False juliencarponcy 41296546 open 0     3 2024-04-19T13:12:28Z 2024-04-19T15:15:52Z   NONE      

What is your issue?

Hi,

I am using the rolling().construct() method which I found very convenient and efficient.

I had timeseries with 2 dimensions: time and channel. I used the construct to produce small overlapping windows of samples on all channels:

xr_data['full_windowed_eeg'] = xr_data['resampled_eeg'] \ .rolling(resampled_time=window_size, min_periods=None) \ .construct("window_tvec", stride=1, keep_attrs=True) \ .dropna('resampled_time') \ .rename({'resampled_time':'window_time'}).copy()

However, after not obtaining the result I expected, I found out that the new coord window_time, was corresponding to the original time coords at the end/right of the window, and not as the first time coord of the window as I expected.

There is no argument to specify this apparently, as in its current state, it allows only for taking the "center coord" or the "right coord" (if center=False).

I expect that the way I wanted it is not so uncommon, so implementing that possibility would be great. But more urgently, I would find it extremely useful and avoiding puzzling debbugging if this behaviour was clearly explained in the API reference.

But maybe I am missing something here?

Thanks for your great work !

 
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     xarray 13221727 issue

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