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  • shoyer · 8 ✖

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  • Transpose some but not all dimensions · 8 ✖

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544363547 https://github.com/pydata/xarray/issues/1081#issuecomment-544363547 https://api.github.com/repos/pydata/xarray/issues/1081 MDEyOklzc3VlQ29tbWVudDU0NDM2MzU0Nw== shoyer 1217238 2019-10-21T06:09:40Z 2019-10-21T06:09:40Z MEMBER

I agree, I think (2) is what most users would expect.

 
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   Transpose some but not all dimensions 187393785
544350457 https://github.com/pydata/xarray/issues/1081#issuecomment-544350457 https://api.github.com/repos/pydata/xarray/issues/1081 MDEyOklzc3VlQ29tbWVudDU0NDM1MDQ1Nw== shoyer 1217238 2019-10-21T05:06:02Z 2019-10-21T05:06:02Z MEMBER

There's one edge case that might be worth thinking carefully about here: Consider a dataset with two variables with dimensions ('w', 'x', 'y', 'z') and ('x', 'w', 'y', 'z'). Now we write .transpose(..., 'z', 'y'). What should the dimensions of variables on the resulting dataset be?

  1. Both ('w', 'x', 'z', 'y'), with ... filled in based on the order of dimensions in the overall dataset.
  2. ('w', 'x', 'y', 'z') and ('x', 'w', 'y', 'z'), with ... filled in for each variable separately.
 
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   Transpose some but not all dimensions 187393785
540678758 https://github.com/pydata/xarray/issues/1081#issuecomment-540678758 https://api.github.com/repos/pydata/xarray/issues/1081 MDEyOklzc3VlQ29tbWVudDU0MDY3ODc1OA== shoyer 1217238 2019-10-10T16:58:59Z 2019-10-10T16:58:59Z MEMBER

Yes, this looks like a great use-case for Ellipsis!

On Thu, Oct 10, 2019 at 2:12 AM crusaderky notifications@github.com wrote:

From personal experience I find that 99% of the time, I want to push some known dimensions either to the front or to the back of the array while I don't care about the order of the others. I'd love to have this syntax:

transpose(..., "x", "y")

or

transpose("x", "y", ...)

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   Transpose some but not all dimensions 187393785
342906368 https://github.com/pydata/xarray/issues/1081#issuecomment-342906368 https://api.github.com/repos/pydata/xarray/issues/1081 MDEyOklzc3VlQ29tbWVudDM0MjkwNjM2OA== shoyer 1217238 2017-11-08T18:14:56Z 2017-11-08T18:14:56Z MEMBER

tranpose('x', 'y') already means ensure this object has dimensions in the order (x, y): ``` In [2]: a = xarray.DataArray([[0]], dims=['x', 'y'])

In [3]: a.T Out[3]: <xarray.DataArray (y: 1, x: 1)> array([[0]]) Dimensions without coordinates: y, x

In [4]: a.T.transpose('x', 'y') Out[4]: <xarray.DataArray (x: 1, y: 1)> array([[0]]) Dimensions without coordinates: x, y

In [5]: a.transpose('x', 'y') Out[5]: <xarray.DataArray (x: 1, y: 1)> array([[0]]) Dimensions without coordinates: x, y ```

 
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   Transpose some but not all dimensions 187393785
342892003 https://github.com/pydata/xarray/issues/1081#issuecomment-342892003 https://api.github.com/repos/pydata/xarray/issues/1081 MDEyOklzc3VlQ29tbWVudDM0Mjg5MjAwMw== shoyer 1217238 2017-11-08T17:27:06Z 2017-11-08T17:27:06Z MEMBER

What about allowing .transpose() to handle a subset of array/dataset dimensions? In NumPy, this may not be desirable because it's easy to mix up integer dimensions, but in xarray ds.transpose('lat', 'lon') seems pretty unambiguous.

The implementation would simply reorder all the listed dimensions, keeping other dimensions in their original order.

 
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   Transpose some but not all dimensions 187393785
258533613 https://github.com/pydata/xarray/issues/1081#issuecomment-258533613 https://api.github.com/repos/pydata/xarray/issues/1081 MDEyOklzc3VlQ29tbWVudDI1ODUzMzYxMw== shoyer 1217238 2016-11-04T20:03:15Z 2016-11-04T20:03:15Z MEMBER

reorder_dims?

Would that be consistent with reorder_levels for MultIindex (#1028)? I'm not sure if that handles partial order specifications or not.

 
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   Transpose some but not all dimensions 187393785
258530895 https://github.com/pydata/xarray/issues/1081#issuecomment-258530895 https://api.github.com/repos/pydata/xarray/issues/1081 MDEyOklzc3VlQ29tbWVudDI1ODUzMDg5NQ== shoyer 1217238 2016-11-04T19:50:54Z 2016-11-04T19:50:54Z MEMBER

You need to provide the full list of dimensions to transpose.

We could add a method like numpy's swap_axes, it's just not clear what to name it.

 
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   Transpose some but not all dimensions 187393785
258529683 https://github.com/pydata/xarray/issues/1081#issuecomment-258529683 https://api.github.com/repos/pydata/xarray/issues/1081 MDEyOklzc3VlQ29tbWVudDI1ODUyOTY4Mw== shoyer 1217238 2016-11-04T19:45:14Z 2016-11-04T19:45:14Z MEMBER

swap_dims does something very different from swap_axes in numpy (we should add an example to make this clear).

For what you want, I think transpose is a closer fit, e.g., foo.transpose('lon', 'lat')

 
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   Transpose some but not all dimensions 187393785

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