issue_comments: 181916808

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https://github.com/pydata/xarray/issues/525#issuecomment-181916808 https://api.github.com/repos/pydata/xarray/issues/525 181916808 MDEyOklzc3VlQ29tbWVudDE4MTkxNjgwOA== 2789820 2016-02-09T15:35:37Z 2016-02-09T15:35:37Z NONE

@hgrecco - for astropy's Quantity, we currently also rely on __array_prepare__ and __array_wrap__. The main annoyances are (1) one cannot change the input before a numpy ufunc is called, and therefore often has no choice but to let a wrong calculation proceed; (2) proper recognition in non-ufunc functions is sparse (e.g., np.dot, etc.; see http://docs.astropy.org/en/latest/known_issues.html#quantity-issues)

Aside: at some point I'd hope to get the various implementations of units to talk together: it would be good to have an API that works such that units are inter-operable.

 
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