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  • cmdupuis3 · 6 ✖

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  • xr.DataSet.expand_dims axis option doesn't work · 6 ✖

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id html_url issue_url node_id user created_at updated_at ▲ author_association body reactions performed_via_github_app issue
1397549856 https://github.com/pydata/xarray/issues/7456#issuecomment-1397549856 https://api.github.com/repos/pydata/xarray/issues/7456 IC_kwDOAMm_X85TTOsg cmdupuis3 45972964 2023-01-19T20:21:12Z 2023-01-19T23:54:29Z NONE

EDIT: Lots of confusion below about nothing, plz disregard

Okay, regardless of expected behavior here, my particular use-case requires that I transpose these dimensions. Can someone show me a way to do this? I tried to explain the xarray point of view to Keras, but Keras is really not interested ;)

I tried something like ds.expand_dims("sample").transpose('sample','nlat','nlon') to complete futility, probably something to do with the Frozen stuff if I had to guess.

 
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   xr.DataSet.expand_dims axis option doesn't work 1548355645
1397648400 https://github.com/pydata/xarray/issues/7456#issuecomment-1397648400 https://api.github.com/repos/pydata/xarray/issues/7456 IC_kwDOAMm_X85TTmwQ cmdupuis3 45972964 2023-01-19T21:45:24Z 2023-01-19T21:45:24Z NONE

I was thinking something like this:

da = xr.DataArray([[1,2,3],[4,5,6],[7,8,9]], coords={'a':[1,2,3], 'b':[1,2,3]}) ds = xr.Dataset({'da':da}) ds1 = ds.expand_dims('yomama', axis=0) print(ds1[0].dims) ds2 = ds.expand_dims('yomama', axis=2) print(ds2[0].dims)

...but this throws an error (like it should). I think I must be reading my code wrong lol

 
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   xr.DataSet.expand_dims axis option doesn't work 1548355645
1397633052 https://github.com/pydata/xarray/issues/7456#issuecomment-1397633052 https://api.github.com/repos/pydata/xarray/issues/7456 IC_kwDOAMm_X85TTjAc cmdupuis3 45972964 2023-01-19T21:29:10Z 2023-01-19T21:29:10Z NONE

Okay I think I get the philosophy now. However, indexing a DataSet with an integer actually does work. If performance is the goal, shouldn't something like ds[0] throw a warning or an error?

 
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   xr.DataSet.expand_dims axis option doesn't work 1548355645
1397588476 https://github.com/pydata/xarray/issues/7456#issuecomment-1397588476 https://api.github.com/repos/pydata/xarray/issues/7456 IC_kwDOAMm_X85TTYH8 cmdupuis3 45972964 2023-01-19T20:49:52Z 2023-01-19T20:53:29Z NONE

Nvm, my use case isn't what I thought it was, but I'll push the issue a bit.

So I'm not disputing anything about what these functions actually do now, the issue I have is that the functions here treat the dimension order of a DataSet as if it's arbitrary, but calling [] on a DataSet slices it in a decidedly non-arbitrary way. It turns out that [] actually does care about which axis you select if you call expand_dims first, and you index with an integer like [0]. I think this inconsistency is what's confusing to me atm.

 
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   xr.DataSet.expand_dims axis option doesn't work 1548355645
1397408991 https://github.com/pydata/xarray/issues/7456#issuecomment-1397408991 https://api.github.com/repos/pydata/xarray/issues/7456 IC_kwDOAMm_X85TSsTf cmdupuis3 45972964 2023-01-19T18:13:16Z 2023-01-19T18:13:16Z NONE

Yeah, I could put something together. It'll probably have to wait until next week though.

 
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   xr.DataSet.expand_dims axis option doesn't work 1548355645
1397292416 https://github.com/pydata/xarray/issues/7456#issuecomment-1397292416 https://api.github.com/repos/pydata/xarray/issues/7456 IC_kwDOAMm_X85TSP2A cmdupuis3 45972964 2023-01-19T16:49:58Z 2023-01-19T16:52:33Z NONE

I mean that's fine, but in that case, the documentation is very misleading 

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   xr.DataSet.expand_dims axis option doesn't work 1548355645

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