|
v0.20.1 (5 November 2021)
-------------------------
This is a bugfix release to fix :issue:`5930`.
Bug fixes
~~~~~~~~~
- Fix a regression in the detection of the backend entrypoints (:issue:`5930`, :pull:`5931`)
By `Justus Magin <https://github.com/keewis>`_.
Documentation
~~~~~~~~~~~~~
- Significant improvements to :ref:`api`. By `Deepak Cherian <https://github.com/dcherian>`_.
.. _whats-new.0.20.0:
v0.20.0 (1 November 2021)
-------------------------
This release brings improved support for pint arrays, methods for weighted standard deviation, variance,
and sum of squares, the option to disable the use of the bottleneck library, significantly improved performance of
unstack, as well as many bugfixes and internal changes.
Many thanks to the 40 contributors to this release!:
Aaron Spring, Akio Taniguchi, Alan D. Snow, arfy slowy, Benoit Bovy, Christian Jauvin, crusaderky, Deepak Cherian,
Giacomo Caria, Illviljan, James Bourbeau, Joe Hamman, Joseph K Aicher, Julien Herzen, Kai Mühlbauer,
keewis, lusewell, Martin K. Scherer, Mathias Hauser, Max Grover, Maxime Liquet, Maximilian Roos, Mike Taves, Nathan Lis,
pmav99, Pushkar Kopparla, Ray Bell, Rio McMahon, Scott Staniewicz, Spencer Clark, Stefan Bender, Taher Chegini,
Thomas Nicholas, Tomas Chor, Tom Augspurger, Victor Negîrneac, Zachary Blackwood, Zachary Moon, and Zeb Nicholls.
New Features
~~~~~~~~~~~~
- Add ``std``, ``var``, ``sum_of_squares`` to :py:class:`~core.weighted.DatasetWeighted` and :py:class:`~core.weighted.DataArrayWeighted`.
By `Christian Jauvin <https://github.com/cjauvin>`_.
- Added a :py:func:`get_options` method to xarray's root namespace (:issue:`5698`, :pull:`5716`)
By `Pushkar Kopparla <https://github.com/pkopparla>`_.
- Xarray now does a better job rendering variable names that are long LaTeX sequences when plotting (:issue:`5681`, :pull:`5682`).
By `Tomas Chor <https://github.com/tomchor>`_.
- Add an option (``"use_bottleneck"``) to disable the use of ``bottleneck`` using :py:func:`set_options` (:pull:`5560`)
By `Justus Magin <https://github.com/keewis>`_.
- Added ``**kwargs`` argument to :py:meth:`open_rasterio` to access overviews (:issue:`3269`).
By `Pushkar Kopparla <https://github.com/pkopparla>`_.
- Added ``storage_options`` argument to :py:meth:`to_zarr` (:issue:`5601`, :pull:`5615`).
By `Ray Bell <https://github.com/raybellwaves>`_, `Zachary Blackwood <https://github.com/blackary>`_ and
`Nathan Lis <https://github.com/wxman22>`_.
- Histogram plots are set with a title displaying the scalar coords if any, similarly to the other plots (:issue:`5791`, :pull:`5792`).
By `Maxime Liquet <https://github.com/maximlt>`_.
- Slice plots display the coords units in the same way as x/y/colorbar labels (:pull:`5847`).
By `Victor Negîrneac <https://github.com/caenrigen>`_.
- Added a new :py:attr:`Dataset.chunksizes`, :py:attr:`DataArray.chunksizes`, and :py:attr:`Variable.chunksizes`
property, which will always return a mapping from dimension names to chunking pattern along that dimension,
regardless of whether the object is a Dataset, DataArray, or Variable. (:issue:`5846`, :pull:`5900`)
By `Tom Nicholas <https://github.com/TomNicholas>`_.
Breaking changes
~~~~~~~~~~~~~~~~
- The minimum versions of some dependencies were changed:
=============== ====== ====
Package Old New
=============== ====== ====
cftime 1.1 1.2
dask 2.15 2.30
distributed 2.15 2.30
lxml 4.5 4.6
matplotlib-base 3.2 3.3
numba 0.49 0.51
numpy 1.17 1.18
pandas 1.0 1.1
pint 0.15 0.16
scipy 1.4 1.5
seaborn 0.10 0.11
sparse 0.8 0.11
toolz 0.10 0.11
zarr 2.4 2.5
=============== ====== ====
- The ``__repr__`` of a :py:class:`xarray.Dataset`'s ``coords`` and ``data_vars``
ignore ``xarray.set_option(display_max_rows=...)`` and show the full output
when called directly as, e.g., ``ds.data_vars`` or ``print(ds.data_vars)``
(:issue:`5545`, :pull:`5580`).
By `Stefan Bender <https://github.com/st-bender>`_.
Deprecations
~~~~~~~~~~~~
- Deprecate :py:func:`open_rasterio` (:issue:`4697`, :pull:`5808`).
By `Alan Snow <https://github.com/snowman2>`_.
- Set the default argument for `roll_coords` to `False` for :py:meth:`DataArray.roll`
and :py:meth:`Dataset.roll`. (:pull:`5653`)
By `Tom Nicholas <https://github.com/TomNicholas>`_.
- :py:meth:`xarray.open_mfdataset` will now error instead of warn when a value for ``concat_dim`` is
passed alongside ``combine='by_coords'``.
By `Tom Nicholas <https://github.com/TomNicholas>`_.
Bug fixes
~~~~~~~~~
- Fix ZeroDivisionError from saving dask array with empty dimension (:issue: `5741`).
By `Joseph K Aicher <https://github.com/jaicher>`_.
- Fixed performance bug where ``cftime`` import attempted within various core operations if ``cftime`` not
installed (:pull:`5640`).
By `Luke Sewell <https://github.com/lusewell>`_
- Fixed bug when combining named DataArrays using :py:func:`combine_by_coords`. (:pull:`5834`).
By `Tom Nicholas <https://github.com/TomNicholas>`_.
- When a custom engine was used in :py:func:`~xarray.open_dataset` the engine
wasn't initialized properly, causing missing argument errors or inconsistent
method signatures. (:pull:`5684`)
By `Jimmy Westling <https://github.com/illviljan>`_.
- Numbers are properly formatted in a plot's title (:issue:`5788`, :pull:`5789`).
By `Maxime Liquet <https://github.com/maximlt>`_.
- Faceted plots will no longer raise a `pint.UnitStrippedWarning` when a `pint.Quantity` array is plotted,
and will correctly display the units of the data in the colorbar (if there is one) (:pull:`5886`).
By `Tom Nicholas <https://github.com/TomNicholas>`_.
- With backends, check for path-like objects rather than ``pathlib.Path``
type, use ``os.fspath`` (:pull:`5879`).
By `Mike Taves <https://github.com/mwtoews>`_.
- ``open_mfdataset()`` now accepts a single ``pathlib.Path`` object (:issue: `5881`).
By `Panos Mavrogiorgos <https://github.com/pmav99>`_.
- Improved performance of :py:meth:`Dataset.unstack` (:pull:`5906`). By `Tom Augspurger <https://github.com/TomAugspurger>`_.
Documentation
~~~~~~~~~~~~~
- Users are instructed to try ``use_cftime=True`` if a ``TypeError`` occurs when combining datasets and one of the types involved is a subclass of ``cftime.datetime`` (:pull:`5776`).
By `Zeb Nicholls <https://github.com/znicholls>`_.
- A clearer error is now raised if a user attempts to assign a Dataset to a single key of
another Dataset. (:pull:`5839`)
By `Tom Nicholas <https://github.com/TomNicholas>`_.
Internal Changes
~~~~~~~~~~~~~~~~
- Explicit indexes refactor: avoid ``len(index)`` in ``map_blocks`` (:pull:`5670`).
By `Deepak Cherian <https://github.com/dcherian>`_.
- Explicit indexes refactor: decouple ``xarray.Index``` from ``xarray.Variable`` (:pull:`5636`).
By `Benoit Bovy <https://github.com/benbovy>`_.
- Fix ``Mapping`` argument typing to allow mypy to pass on ``str`` keys (:pull:`5690`).
By `Maximilian Roos <https://github.com/max-sixty>`_.
- Annotate many of our tests, and fix some of the resulting typing errors. This will
also mean our typing annotations are tested as part of CI. (:pull:`5728`).
By `Maximilian Roos <https://github.com/max-sixty>`_.
- Improve the performance of reprs for large datasets or dataarrays. (:pull:`5661`)
By `Jimmy Westling <https://github.com/illviljan>`_.
- Use isort's `float_to_top` config. (:pull:`5695`).
By `Maximilian Roos <https://github.com/max-sixty>`_.
- Remove use of the deprecated ``kind`` argument in
:py:meth:`pandas.Index.get_slice_bound` inside :py:class:`xarray.CFTimeIndex`
tests (:pull:`5723`). By `Spencer Clark <https://github.com/spencerkclark>`_.
- Refactor `xarray.core.duck_array_ops` to no longer special-case dispatching to
dask versions of functions when acting on dask arrays, instead relying numpy
and dask's adherence to NEP-18 to dispatch automatically. (:pull:`5571`)
By `Tom Nicholas <https://github.com/TomNicholas>`_.
- Add an ASV benchmark CI and improve performance of the benchmarks (:pull:`5796`)
By `Jimmy Westling <https://github.com/illviljan>`_.
- Use ``importlib`` to replace functionality of ``pkg_resources`` such
as version setting and loading of resources. (:pull:`5845`).
By `Martin K. Scherer <https://github.com/marscher>`_.
.. _whats-new.0.19.0:
v0.19.0 (23 July 2021)
----------------------
This release brings improvements to plotting of categorical data, the ability to specify how attributes
are combined in xarray operations, a new high-level :py:func:`unify_chunks` function, as well as various
deprecations, bug fixes, and minor improvements.
Many thanks to the 29 contributors to this release!:
Andrew Williams, Augustus, Aureliana Barghini, Benoit Bovy, crusaderky, Deepak Cherian, ellesmith88,
Elliott Sales de Andrade, Giacomo Caria, github-actions[bot], Illviljan, Joeperdefloep, joooeey, Julia Kent,
Julius Busecke, keewis, Mathias Hauser, Matthias Göbel, Mattia Almansi, Maximilian Roos, Peter Andreas Entschev,
Ray Bell, Sander, Santiago Soler, Sebastian, Spencer Clark, Stephan Hoyer, Thomas Hirtz, Thomas Nicholas.
New Features
~~~~~~~~~~~~
- Allow passing argument ``missing_dims`` to :py:meth:`Variable.transpose` and :py:meth:`Dataset.transpose`
(:issue:`5550`, :pull:`5586`)
By `Giacomo Caria <https://github.com/gcaria>`_.
- Allow passing a dictionary as coords to a :py:class:`DataArray` (:issue:`5527`,
reverts :pull:`1539`, which had deprecated this due to python's inconsistent ordering in earlier versions).
By `Sander van Rijn <https://github.com/sjvrijn>`_.
- Added :py:meth:`Dataset.coarsen.construct`, :py:meth:`DataArray.coarsen.construct` (:issue:`5454`, :pull:`5475`).
By `Deepak Cherian <https://github.com/dcherian>`_.
- Xarray now uses consolidated metadata by default when writing and reading Zarr
stores (:issue:`5251`).
By `Stephan Hoyer <https://github.com/shoyer>`_.
- New top-level function :py:func:`unify_chunks`.
By `Mattia Almansi <https://github.com/malmans2>`_.
- Allow assigning values to a subset of a dataset using positional or label-based
indexing (:issue:`3015`, :pull:`5362`).
By `Matthias Göbel <https://github.com/matzegoebel>`_.
- Attempting to reduce a weighted object over missing dimensions now raises an error (:pull:`5362`).
By `Mattia Almansi <https://github.com/malmans2>`_.
- Add ``.sum`` to :py:meth:`~xarray.DataArray.rolling_exp` and
:py:meth:`~xarray.Dataset.rolling_exp` for exponentially weighted rolling
sums. These require numbagg 0.2.1;
(:pull:`5178`).
By `Maximilian Roos <https://github.com/max-sixty>`_.
- :py:func:`xarray.cov` and :py:func:`xarray.corr` now lazily check for missing
values if inputs are dask arrays (:issue:`4804`, :pull:`5284`).
By `Andrew Williams <https://github.com/AndrewWilliams3142>`_.
- Attempting to ``concat`` list of elements that are not all ``Dataset`` or all ``DataArray`` now raises an error (:issue:`5051`, :pull:`5425`).
By `Thomas Hirtz <https://github.com/thomashirtz>`_.
- allow passing a function to ``combine_attrs`` (:pull:`4896`).
By `Justus Magin <https://github.com/keewis>`_.
- Allow plotting categorical data (:pull:`5464`).
By `Jimmy Westling <https://github.com/illviljan>`_.
- Allow removal of the coordinate attribute ``coordinates`` on variables by setting ``.attrs['coordinates']= None``
(:issue:`5510`).
By `Elle Smith <https://github.com/ellesmith88>`_.
- Added :py:meth:`DataArray.to_numpy`, :py:meth:`DataArray.as_numpy`, and :py:meth:`Dataset.as_numpy`. (:pull:`5568`).
By `Tom Nicholas <https://github.com/TomNicholas>`_.
- Units in plot labels are now automatically inferred from wrapped :py:meth:`pint.Quantity` arrays. (:pull:`5561`).
By `Tom Nicholas <https://github.com/TomNicholas>`_.
Breaking changes
~~~~~~~~~~~~~~~~
- The default ``mode`` for :py:meth:`Dataset.to_zarr` when ``region`` is set
has changed to the new ``mode="r+"``, which only allows for overriding
pre-existing array values. This is a safer default than the prior ``mode="a"``,
and allows for higher performance writes (:pull:`5252`).
By `Stephan Hoyer <https://github.com/shoyer>`_.
- The main parameter to :py:func:`combine_by_coords` is renamed to `data_objects` instead
of `datasets` so anyone calling this method using a named parameter will need to update
the name accordingly (:issue:`3248`, :pull:`4696`).
By `Augustus Ijams <https://github.com/aijams>`_.
Deprecations
~~~~~~~~~~~~
- Removed the deprecated ``dim`` kwarg to :py:func:`DataArray.integrate` (:pull:`5630`)
- Removed the deprecated ``keep_attrs`` kwarg to :py:func:`DataArray.rolling` (:pull:`5630`)
- Removed the deprecated ``keep_attrs`` kwarg to :py:func:`DataArray.coarsen` (:pull:`5630`)
- Completed deprecation of passing an ``xarray.DataArray`` to :py:func:`Variable` - will now raise a ``TypeError`` (:pull:`5630`)
Bug fixes
~~~~~~~~~
- Fix a minor incompatibility between partial datetime string indexing with a
:py:class:`CFTimeIndex` and upcoming pandas version 1.3.0 (:issue:`5356`,
:pull:`5359`).
By `Spencer Clark <https://github.com/spencerkclark>`_.
- Fix 1-level multi-index incorrectly converted to single index (:issue:`5384`,
:pull:`5385`).
By `Benoit Bovy <https://github.com/benbovy>`_.
- Don't cast a duck array in a coordinate to :py:class:`numpy.ndarray` in
:py:meth:`DataArray.differentiate` (:pull:`5408`)
By `Justus Magin <https://github.com/keewis>`_.
- Fix the ``repr`` of :py:class:`Variable` objects with ``display_expand_data=True``
(:pull:`5406`)
By `Justus Magin <https://github.com/keewis>`_.
- Plotting a pcolormesh with ``xscale="log"`` and/or ``yscale="log"`` works as
expected after improving the way the interval breaks are generated (:issue:`5333`).
By `Santiago Soler <https://github.com/santisoler>`_
- :py:func:`combine_by_coords` can now handle combining a list of unnamed
``DataArray`` as input (:issue:`3248`, :pull:`4696`).
By `Augustus Ijams <https://github.com/aijams>`_.
Internal Changes
~~~~~~~~~~~~~~~~
- Run CI on the first & last python versions supported only; currently 3.7 & 3.9.
(:pull:`5433`)
By `Maximilian Roos <https://github.com/max-sixty>`_.
- Publish test results & timings on each PR.
(:pull:`5537`)
By `Maximilian Roos <https://github.com/max-sixty>`_.
- Explicit indexes refactor: add a ``xarray.Index.query()`` method in which
one may eventually provide a custom implementation of label-based data
selection (not ready yet for public use). Also refactor the internal,
pandas-specific implementation into ``PandasIndex.query()`` and
``PandasMultiIndex.query()`` (:pull:`5322`).
By `Benoit Bovy <https://github.com/benbovy>`_.
|
|
v0.18.0 (6 May 2021)
This release brings a few important performance improvements, a wide range of usability upgrades, lots of bug fixes, and some new features. These include a plugin API to add backend engines, a new theme for the documentation, curve fitting methods, and several new plotting functions.
v0.17.0 (24 Feb 2021)
This release brings a few important performance improvements, a wide range of usability upgrades, lots of bug fixes, and some new features. These include better cftime support, a new quiver plot, better unstack performance, more efficient memory use in rolling operations, and some python packaging improvements. We also have a few documentation improvements (and more planned!).
v0.16.2 (30 Nov 2020)
This release brings the ability to write to limited regions of zarr files, open zarr files with :py:func:`open_dataset` and :py:func:`open_mfdataset`, increased support for propagating attrs using the keep_attrs flag, as well as numerous bugfixes and documentation improvements.
v0.16.1 (2020-09-20)
This patch release fixes an incompatibility with a recent pandas change, which was causing an issue indexing with a datetime64. It also includes improvements to rolling, to_dataframe, cov & corr methods and bug fixes. Our documentation has a number of improvements, including fixing all doctests and confirming their accuracy on every commit.
v0.16.0 (2020-07-11)
This release adds xarray.cov & xarray.corr for covariance & correlation respectively; the idxmax & idxmin methods, the polyfit method & xarray.polyval for fitting polynomials, as well as a number of documentation improvements, other features, and bug fixes. Many thanks to all 44 contributors who contributed to this release:
|
|
v0.15.1:
This release brings many new features such as :py:meth:`Dataset.weighted` methods for weighted array
reductions, a new jupyter repr by default, and the start of units integration with pint. There's also
the usual batch of usability improvements, documentation additions, and bug fixes.
Breaking changes
- Raise an error when assigning to the ``.values`` or ``.data`` attribute of
dimension coordinates i.e. ``IndexVariable`` objects. This has been broken since
v0.12.0. Please use :py:meth:`DataArray.assign_coords` or :py:meth:`Dataset.assign_coords`
instead.
New Features
- Weighted array reductions are now supported via the new :py:meth:`DataArray.weighted`
and :py:meth:`Dataset.weighted` methods. See :ref:`comput.weighted`.
- The new jupyter notebook repr (``Dataset._repr_html_`` and
``DataArray._repr_html_``) (introduced in 0.14.1) is now on by default. To
disable, use ``xarray.set_options(display_style="text")``.
- Added support for :py:class:`pandas.DatetimeIndex`-style rounding of
``cftime.datetime`` objects directly via a :py:class:`CFTimeIndex` or via the
:py:class:`~core.accessor_dt.DatetimeAccessor`.
- Support new h5netcdf backend keyword `phony_dims` (available from h5netcdf
v0.8.0 for :py:class:`~xarray.backends.H5NetCDFStore`.
- Add partial support for unit aware arrays with pint.
- :py:meth:`Dataset.groupby` and :py:meth:`DataArray.groupby` now raise a
`TypeError` on multiple string arguments. Receiving multiple string arguments
often means a user is attempting to pass multiple dimensions as separate
arguments and should instead pass a single list of dimensions.
- :py:func:`map_blocks` can now apply functions that add new unindexed dimensions.
- An ellipsis (``...``) is now supported in the ``dims`` argument of
:py:meth:`Dataset.stack` and :py:meth:`DataArray.stack`, meaning all
unlisted dimensions, similar to its meaning in :py:meth:`DataArray.transpose`.
- :py:meth:`Dataset.where` and :py:meth:`DataArray.where` accept a lambda as a
first argument, which is then called on the input; replicating pandas' behavior.
- ``skipna`` is available in :py:meth:`Dataset.quantile`, :py:meth:`DataArray.quantile`,
:py:meth:`core.groupby.DatasetGroupBy.quantile`, :py:meth:`core.groupby.DataArrayGroupBy.quantile`
Bug fixes
- Fix :py:meth:`Dataset.interp` when indexing array shares coordinates with the
indexed variable
- Fix recombination of groups in :py:meth:`Dataset.groupby` and
:py:meth:`DataArray.groupby` when performing an operation that changes the
size of the groups along the grouped dimension. By `Eric Jansen
<https://github.com/ej81>`_.
- Fix use of multi-index with categorical values
- Fix alignment with ``join="override"`` when some dimensions are unindexed.
- Fix :py:meth:`Dataset.swap_dims` and :py:meth:`DataArray.swap_dims` producing
index with name reflecting the previous dimension name instead of the new one
- Use ``dask_array_type`` instead of ``dask_array.Array`` for type
checking.
- :py:func:`concat` can now handle coordinate variables only present in one of
the objects to be concatenated when ``coords="different"``.
- xarray now respects the over, under and bad colors if set on a provided colormap.
- :py:func:`coarsen` now respects ``xr.set_options(keep_attrs=True)``
to preserve attributes. :py:meth:`Dataset.coarsen` accepts a keyword
argument ``keep_attrs`` to change this setting.
:pull:`3801`) By `Andrew Thomas <https://github.com/amcnicho>`_.
- Delete associated indexes when deleting coordinate variables.
- Fix :py:meth:`xarray.core.dataset.Dataset.to_zarr` when using `append_dim` and `group`
simultaneously.
- Fix html repr on :py:class:`Dataset` with non-string keys
Documentation
- Fix documentation of :py:class:`DataArray` removing the deprecated mention
that when omitted, `dims` are inferred from a `coords`-dict.
- Improve the :py:func:`where` docstring.
- Update the installation instructions: only explicitly list recommended dependencies
Internal Changes
- Remove the internal ``import_seaborn`` function which handled the deprecation of
the ``seaborn.apionly`` entry point
- Don't test pint integration in combination with datetime objects.
- Change test_open_mfdataset_list_attr to only run with dask installed
- Preserve the ability to index with ``method="nearest"`` with a
:py:class:`CFTimeIndex` with pandas versions greater than 1.0.1
- Greater flexibility and improved test coverage of subtracting various types
of objects from a :py:class:`CFTimeIndex`. By `Spencer Clark
<https://github.com/spencerkclark>`_.
- Update Azure CI MacOS image, given pending removal.
- Remove xfails for scipy 1.0.1 for tests that append to netCDF files
- Remove conversion to :py:class:`pandas.Panel`, given its removal in pandas
in favor of xarray's objects.
v0.15.0:
This release brings many improvements to xarray's documentation: our examples are now binderized notebooks (`click here <https://mybinder.org/v2/gh/pydata/xarray/master?urlpath=lab/tree/doc/examples/weather-data.ipynb>`_)
and we have new example notebooks from our SciPy 2019 sprint (many thanks to our contributors!).
This release also features many API improvements such as a new
:py:class:`~core.accessor_dt.TimedeltaAccessor` and support for :py:class:`CFTimeIndex` in
:py:meth:`~DataArray.interpolate_na`); as well as many bug fixes.
Breaking changes
- Bumped minimum tested versions for dependencies:
- numpy 1.15
- pandas 0.25
- dask 2.2
- distributed 2.2
- scipy 1.3
- Remove ``compat`` and ``encoding`` kwargs from ``DataArray``, which
have been deprecated since 0.12.
Instead, specify the ``encoding`` kwarg when writing to disk or set
the :py:attr:`DataArray.encoding` attribute directly.
- :py:func:`xarray.dot`, :py:meth:`DataArray.dot`, and the ``@`` operator now
use ``align="inner"`` (except when ``xarray.set_options(arithmetic_join="exact")``;
New Features
- Implement :py:meth:`DataArray.pad` and :py:meth:`Dataset.pad`.
- :py:meth:`DataArray.sel` and :py:meth:`Dataset.sel` now support :py:class:`pandas.CategoricalIndex`.
- Support using an existing, opened h5netcdf ``File`` with
:py:class:`~xarray.backends.H5NetCDFStore`. This permits creating an
:py:class:`~xarray.Dataset` from a h5netcdf ``File`` that has been opened
using other means
- Implement ``median`` and ``nanmedian`` for dask arrays. This works by rechunking
to a single chunk along all reduction axes.
- :py:func:`~xarray.concat` now preserves attributes from the first Variable.
- :py:meth:`Dataset.quantile`, :py:meth:`DataArray.quantile` and ``GroupBy.quantile``
now work with dask Variables.
- Added the ``count`` reduction method to both :py:class:`~core.rolling.DatasetCoarsen`
and :py:class:`~core.rolling.DataArrayCoarsen` objects.
- Add ``meta`` kwarg to :py:func:`~xarray.apply_ufunc`;
this is passed on to :py:func:`dask.array.blockwise`.
- Add ``attrs_file`` option in :py:func:`~xarray.open_mfdataset` to choose the
source file for global attributes in a multi-file dataset
:pull:`3498`). By `Julien Seguinot <https://github.com/juseg>`_.
- :py:meth:`Dataset.swap_dims` and :py:meth:`DataArray.swap_dims`
now allow swapping to dimension names that don't exist yet.
- Extend :py:class:`~core.accessor_dt.DatetimeAccessor` properties
and support ``.dt`` accessor for timedeltas
via :py:class:`~core.accessor_dt.TimedeltaAccessor`
- Improvements to interpolating along time axes
- Support :py:class:`CFTimeIndex` in :py:meth:`DataArray.interpolate_na`
- define 1970-01-01 as the default offset for the interpolation index for both
:py:class:`pandas.DatetimeIndex` and :py:class:`CFTimeIndex`,
- use microseconds in the conversion from timedelta objects to floats to avoid
overflow errors.
Bug fixes
- Applying a user-defined function that adds new dimensions using :py:func:`apply_ufunc`
and ``vectorize=True`` now works with ``dask > 2.0``.
- Fix :py:meth:`~xarray.combine_by_coords` to allow for combining incomplete
hypercubes of Datasets
- Fix :py:func:`~xarray.combine_by_coords` when combining cftime coordinates
which span long time intervals
- Fix plotting with transposed 2D non-dimensional coordinates.
- :py:meth:`plot.FacetGrid.set_titles` can now replace existing row titles of a
:py:class:`~xarray.plot.FacetGrid` plot. In addition :py:class:`~xarray.plot.FacetGrid` gained
two new attributes: :py:attr:`~xarray.plot.FacetGrid.col_labels` and
:py:attr:`~xarray.plot.FacetGrid.row_labels` contain :py:class:`matplotlib.text.Text` handles for both column and
row labels. These can be used to manually change the labels.
- Fix issue with Dask-backed datasets raising a ``KeyError`` on some computations involving :py:func:`map_blocks`
- Ensure :py:meth:`Dataset.quantile`, :py:meth:`DataArray.quantile` issue the correct error
when ``q`` is out of bounds
- Fix regression in xarray 0.14.1 that prevented encoding times with certain
``dtype``, ``_FillValue``, and ``missing_value`` encodings
- Raise an error when trying to use :py:meth:`Dataset.rename_dims` to
rename to an existing name
- :py:meth:`Dataset.rename`, :py:meth:`DataArray.rename` now check for conflicts with
MultiIndex level names.
- :py:meth:`Dataset.merge` no longer fails when passed a :py:class:`DataArray` instead of a :py:class:`Dataset`.
- Fix a regression in :py:meth:`Dataset.drop`: allow passing any
iterable when dropping variables
- Fixed errors emitted by ``mypy --strict`` in modules that import xarray.
- Allow plotting of binned coordinates on the y axis in :py:meth:`plot.line`
and :py:meth:`plot.step` plots
- setuptools is now marked as a dependency of xarray
Documentation
- Switch doc examples to use `nbsphinx <https://nbsphinx.readthedocs.io>`_ and replace
``sphinx_gallery`` scripts with Jupyter notebooks.
- Added :doc:`example notebook <examples/ROMS_ocean_model>` demonstrating use of xarray with
Regional Ocean Modeling System (ROMS) ocean hydrodynamic model output.
- Added :doc:`example notebook <examples/ERA5-GRIB-example>` demonstrating the visualization of
ERA5 GRIB data.
`Stephan Siemen <https://github.com/StephanSiemen>`_.
- Added examples for :py:meth:`DataArray.quantile`, :py:meth:`Dataset.quantile` and
``GroupBy.quantile``.
- Add new :doc:`example notebook <examples/apply_ufunc_vectorize_1d>` example notebook demonstrating
vectorization of a 1D function using :py:func:`apply_ufunc` , dask and numba.
- Added example for :py:func:`~xarray.map_blocks`.
Internal Changes
- Make sure dask names change when rechunking by different chunk sizes. Conversely, make sure they
stay the same when rechunking by the same chunk size.
- 2x to 5x speed boost (on small arrays) for :py:meth:`Dataset.isel`,
:py:meth:`DataArray.isel`, and :py:meth:`DataArray.__getitem__` when indexing by int,
slice, list of int, scalar ndarray, or 1-dimensional ndarray.
- Removed internal method ``Dataset._from_vars_and_coord_names``,
which was dominated by ``Dataset._construct_direct``.
- Replaced versioneer with setuptools-scm. Moved contents of setup.py to setup.cfg.
Removed pytest-runner from setup.py, as per deprecation notice on the pytest-runner
project.
- Use of isort is now enforced by CI.
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