issue_comments: 76500617

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https://github.com/pydata/xarray/issues/343#issuecomment-76500617 https://api.github.com/repos/pydata/xarray/issues/343 76500617 MDEyOklzc3VlQ29tbWVudDc2NTAwNjE3 7462311 2015-02-28T01:02:27Z 2015-02-28T01:02:27Z NONE

Points taken. Thanks for responding so quickly. I didn't realize that Pandas does something similar. I understand that the default behavior of NumPy/Python is to pass by reference (assignment) but I didn't realize that this rule applies even when converting an object from one type to another. Now that I have checked, np.ma.masked_array also uses a reference to the input data by default (however, it also provides the option for creating a copy).

In the API reference for DataArray, it probably wouldn't hurt to say that the input data is not copied by default and that a reference is used instead. I guess making note of this would only benefit less experienced users like myself, but it would be appreciated. 

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