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  • indexing error in sel subsets · 6 ✖
id html_url issue_url node_id user created_at updated_at ▲ author_association body reactions performed_via_github_app issue
298803481 https://github.com/pydata/xarray/issues/1374#issuecomment-298803481 https://api.github.com/repos/pydata/xarray/issues/1374 MDEyOklzc3VlQ29tbWVudDI5ODgwMzQ4MQ== shoyer 1217238 2017-05-03T01:19:36Z 2017-05-03T01:19:36Z MEMBER

There's not really an elegant solution here, but I'll figure something out.

 
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   indexing error in sel subsets 221855729
298802941 https://github.com/pydata/xarray/issues/1374#issuecomment-298802941 https://api.github.com/repos/pydata/xarray/issues/1374 MDEyOklzc3VlQ29tbWVudDI5ODgwMjk0MQ== chunweiyuan 5572303 2017-05-03T01:14:12Z 2017-05-03T01:14:12Z CONTRIBUTOR

This has impacted our workflow as well. Please let us know if we can help.

 
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   indexing error in sel subsets 221855729
295578094 https://github.com/pydata/xarray/issues/1374#issuecomment-295578094 https://api.github.com/repos/pydata/xarray/issues/1374 MDEyOklzc3VlQ29tbWVudDI5NTU3ODA5NA== shoyer 1217238 2017-04-20T04:37:18Z 2017-04-20T04:37:38Z MEMBER

The issue appears to be in our internal CopyOnWriteArray and MemoryCachedArray classes. When the wrapped array is a scalar string, indexing with an empty tuple doesn't work properly: ``` In [14]: from xarray.core.indexing import CopyOnWriteArray, MemoryCachedArray

In [15]: x = CopyOnWriteArray(np.array([1, 2, 3]))

In [16]: x[0] Out[16]: CopyOnWriteArray(array=1)

In [17]: x[0][()] Out[17]: CopyOnWriteArray(array=1)

In [18]: x = CopyOnWriteArray(np.array(['foo', 'bar']))

In [19]: x[0] Out[19]: CopyOnWriteArray(array='foo')

In [20]: x[0][()]

TypeError Traceback (most recent call last) <ipython-input-20-e2b82e9c4874> in <module>() ----> 1 x[0][()]

/Users/shoyer/dev/xarray/xarray/core/indexing.py in getitem(self, key) 401 402 def getitem(self, key): --> 403 return type(self)(self.array[key]) 404 405 def setitem(self, key, value):

TypeError: string indices must be integers `` In some sense, the source issue is thatx[()]` works for numpy scalar numbers, but not strings.

I will see if I can come up with an elegant fix...

 
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   indexing error in sel subsets 221855729
295576554 https://github.com/pydata/xarray/issues/1374#issuecomment-295576554 https://api.github.com/repos/pydata/xarray/issues/1374 MDEyOklzc3VlQ29tbWVudDI5NTU3NjU1NA== shoyer 1217238 2017-04-20T04:25:33Z 2017-04-20T04:25:33Z MEMBER

Marking this as a bug. I can reproduce this locally on master.

 
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   indexing error in sel subsets 221855729
294520876 https://github.com/pydata/xarray/issues/1374#issuecomment-294520876 https://api.github.com/repos/pydata/xarray/issues/1374 MDEyOklzc3VlQ29tbWVudDI5NDUyMDg3Ng== Yefee 6420873 2017-04-17T16:25:12Z 2017-04-17T16:25:12Z NONE

It should be the default engine netCDF4. Here I provided a file: https://github.com/Yefee/bugs-fix/blob/master/lgm2co2.nc

 
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   indexing error in sel subsets 221855729
294251213 https://github.com/pydata/xarray/issues/1374#issuecomment-294251213 https://api.github.com/repos/pydata/xarray/issues/1374 MDEyOklzc3VlQ29tbWVudDI5NDI1MTIxMw== shoyer 1217238 2017-04-14T22:49:49Z 2017-04-14T22:49:49Z MEMBER

Are you using netCDF4 or scipy to read this data? Can you post a small file that illustrates the issue?

 
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   indexing error in sel subsets 221855729

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