issues: 39385095

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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
39385095 MDU6SXNzdWUzOTM4NTA5NQ== 203 Support mathematical operators (+-*/, etc) for GroupBy objects 1217238 closed 0   740776 0 2014-08-04T01:40:11Z 2014-09-12T01:18:04Z 2014-09-12T01:18:04Z MEMBER      

Building on #200, we could add support for mathematical operations to GroupBy objects.

Math with groupby objects should automatically "broadcast" across group labels, so we can write something like:

climatology = ds.groupby('time.month').mean('time') anomalies = ds.groupby('time.month') - climatology

 
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