issues: 712217045

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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
712217045 MDU6SXNzdWU3MTIyMTcwNDU= 4476 Reimplement GroupBy.argmax 1200058 open 0     5 2020-09-30T19:25:22Z 2023-03-03T06:59:40Z   NONE      

Please implement

Is your feature request related to a problem? Please describe. Observed: python da.groupby("g").argmax(dim="t") ```python

AttributeError Traceback (most recent call last) <ipython-input-84-15c199b0f7d4> in <module> ----> 1 da.groupby("g").argmax(dim="t")

AttributeError: 'DataArrayGroupBy' object has no attribute 'argmax' ```

Describe the solution you'd like Expected: Vector of length len(unique(g)) containing the indices of da["t"] where the value was maximum.

Workaround: python da.groupby("g").apply(lambda c: c.argmax(dim="t")) <xarray.DataArray 'da' (st: 11, g: 1)> array([[ 7], [ 0], [14], [14], [ 0], [ 0], [ 7], [ 0], [14], [ 0], [ 7]]) Coordinates: * st (st) object 'a' ... 'z' * g (g) object 'E'

 
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     13221727 issue

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