issue_comments: 702671253

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https://github.com/pydata/xarray/issues/4471#issuecomment-702671253 https://api.github.com/repos/pydata/xarray/issues/4471 702671253 MDEyOklzc3VlQ29tbWVudDcwMjY3MTI1Mw== 500246 2020-10-02T11:07:33Z 2020-10-02T11:07:33Z CONTRIBUTOR

The ds.load() prevents the traceback because it means the entire n-d data variable is multiplied with the 1-d scale factor. Similarly, requesting a slice (ds["Rad"][400:402, 300:302]) also prevents a traceback. The traceback occurs if a single value is requested, because then Python will complain about multiplying a scalar with a 1-d array. I'm not entirely sure why, but would be a numpy issue:

``` In [7]: a = np.array(0)

In [8]: b = np.array([0])

In [9]: a * b Out[9]: array([0])

In [10]: a *= b

ValueError Traceback (most recent call last) <ipython-input-10-0d04f348f081> in <module> ----> 1 a *= b

ValueError: non-broadcastable output operand with shape () doesn't match the broadcast shape (1,) ```

 
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