issue_comments: 275778443

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https://github.com/pydata/xarray/issues/60#issuecomment-275778443 https://api.github.com/repos/pydata/xarray/issues/60 275778443 MDEyOklzc3VlQ29tbWVudDI3NTc3ODQ0Mw== 8982598 2017-01-27T21:24:31Z 2017-01-27T21:24:31Z CONTRIBUTOR

Just as I am interested in having this functionality, and the new apply_ufunc is available, would something along these lines suffice?

```python from wherever import argmax, take # numpy or dask

def gufunc_idxmax(x, y, axis=None): indx = argmax(x, axis) return take(y, indx)

def idxmax(obj, dim): sig = ([(dim,), (dim,)], [()]) kwargs = {'axis': -1} return apply_ufunc(gufunc_idxmin, obj, obj[dim], signature=sig, kwargs=kwargs, dask_array='allowed') ```

 
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