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Improve the documentation of swap_dims #3331

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Sep 22, 2019
Merged

Improve the documentation of swap_dims #3331

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50221ab
add an example to DataArray.swap_dims (and fix the documented return …
keewis Sep 21, 2019
455968b
add an example to Dataset.swap_dims
keewis Sep 21, 2019
9029e5f
fix some errors in the swapped array's repr
keewis Sep 21, 2019
efb03f4
remove a newline
keewis Sep 22, 2019
0313df9
mention changes in whatsnew
keewis Sep 22, 2019
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4 changes: 4 additions & 0 deletions doc/whats-new.rst
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Expand Up @@ -25,6 +25,10 @@ Bug fixes
objects remain unaddressable by weakref in order to save memory.
(:issue:`3317`) by `Guido Imperiale <https://github.com/crusaderky>`_.

Documentation
~~~~~~~~~~~~~
- Add examples for :py:meth:`Dataset.swap_dims` and :py:meth:`DataArray.swap_dims`.
By `Justus Magin <https://github.com/keewis>`_.

.. _whats-new.0.13.0:

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19 changes: 18 additions & 1 deletion xarray/core/dataarray.py
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Expand Up @@ -1453,9 +1453,26 @@ def swap_dims(self, dims_dict: Mapping[Hashable, Hashable]) -> "DataArray":

Returns
-------
swapped : Dataset
swapped : DataArray
DataArray with swapped dimensions.

Examples
--------
>>> arr = xr.DataArray(data=[0, 1], dims="x",
coords={"x": ["a", "b"], "y": ("x", [0, 1])})
>>> arr
<xarray.DataArray (x: 2)>
array([0, 1])
Coordinates:
* x (x) <U1 'a' 'b'
y (x) int64 0 1
>>> arr.swap_dims({"x": "y"})
<xarray.DataArray (y: 2)>
array([0, 1])
Coordinates:
x (y) <U1 'a' 'b'
* y (y) int64 0 1

See Also
--------

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23 changes: 23 additions & 0 deletions xarray/core/dataset.py
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Expand Up @@ -2679,6 +2679,29 @@ def swap_dims(
swapped : Dataset
Dataset with swapped dimensions.

Examples
--------
>>> ds = xr.Dataset(data_vars={"a": ("x", [5, 7]), "b": ("x", [0.1, 2.4])},
coords={"x": ["a", "b"], "y": ("x", [0, 1])})
>>> ds
<xarray.Dataset>
Dimensions: (x: 2)
Coordinates:
* x (x) <U1 'a' 'b'
y (x) int64 0 1
Data variables:
a (x) int64 5 7
b (x) float64 0.1 2.4
>>> ds.swap_dims({"x": "y"})
<xarray.Dataset>
Dimensions: (y: 2)
Coordinates:
x (y) <U1 'a' 'b'
* y (y) int64 0 1
Data variables:
a (y) int64 5 7
b (y) float64 0.1 2.4

See Also
--------

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