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cf functions¶

Version 3.21.0 for version 1.13 of the CF conventions.

Reading and writing¶

`cf.read`	Read field or domain constructs from files.
`cf.write`	Write field and domain constructs to a dataset.

Aggregation¶

`cf.aggregate`	Aggregate field constructs into as few field constructs as possible.
`cf.climatology_cells`	Return a climatological cells dictionary for `cf.aggregate`.

Mathematical operations¶

`cf.atol`	The numerical equality tolerance on absolute differences.
`cf.rtol`	The numerical equality tolerance on relative differences.
`cf.bounds_combination_mode`	Determine how to deal with cell bounds in binary operations.
`cf.default_netCDF_fillvals`	Default data array fill values for each data type.
`cf.curl_xy`	Calculate the horizontal curl of an (X, Y) vector.
`cf.div_xy`	Calculate the horizontal divergence of an (X, Y) vector.
`cf.histogram`	Return the distribution of a set of variables in the form of an N-dimensional histogram.
`cf.ATOL`	Alias for `cf.atol`.
`cf.RTOL`	Alias for `cf.rtol`.

Condition constructors¶

General conditions

`cf.eq`	A `Query` object for an "equal" condition.
`cf.ge`	A `Query` object for a "greater than or equal" condition.
`cf.gt`	A `Query` object for a "strictly greater than" condition.
`cf.le`	A `Query` object for a "less than or equal" condition.
`cf.lt`	A `Query` object for a "strictly less than" condition.
`cf.ne`	A `Query` object for a "not equal" condition.
`cf.wi`	A `Query` object for a "within a range" condition.
`cf.wo`	A `Query` object for a "without a range" condition.
`cf.set`	A `Query` object for a "member of set" condition.
`cf.isclose`	A `Query` object for an "is close" condition.

Date-time conditions

`cf.year`	A `Query` object for a "year" condition.
`cf.month`	A `Query` object for a "month of the year" condition.
`cf.day`	A `Query` object for a "day of the month" condition.
`cf.hour`	A `Query` object for a "hour of the day" condition.
`cf.minute`	A `Query` object for a "minute of the hour" condition.
`cf.second`	A `Query` object for a "second of the minute" condition.
`cf.jja`	A `Query` object for a "month of year in June, July or August" condition.
`cf.son`	A `Query` object for a "month of year in September, October, November" condition.
`cf.djf`	A `Query` object for a "month of year in December, January, February" condition.
`cf.mam`	A `Query` object for a "month of year in March, April, May" condition.
`cf.seasons`	A customisable list of `Query` objects for "seasons in a year" conditions.

Coordinate cell conditions

`cf.contains`	A `Query` object for a "cell contains" condition.
`cf.cellsize`	A `Query` object for a "cell size" condition.
`cf.cellgt`	A `Query` object for a "cell bounds strictly greater than" condition.
`cf.cellge`	A `Query` object for a "cell bounds greater than or equal" condition.
`cf.cellle`	A `Query` object for a "cell bounds less than or equal" condition.
`cf.celllt`	A `Query` object for a “cell bounds strictly less than” condition.
`cf.cellwi`	A `Query` object for a "cell bounds lie within range" condition.
`cf.cellwo`	A `Query` object for a "cell bounds lie without range" condition.

Date-time and time duration¶

`cf.dt`	Return a date-time object for a date and time according to a calendar.
`cf.dt_vector`	Return a 1-d array of date-time objects.
`cf.Y`	Return a time duration of calendar years in a `cf.TimeDuration` object.
`cf.M`	Return a time duration of calendar months in a `cf.TimeDuration` object.
`cf.D`	Return a time duration of days in a `cf.TimeDuration` object.
`cf.h`	Return a time duration of hours in a `cf.TimeDuration` object.
`cf.m`	Return a time duration of minutes in a `cf.TimeDuration` object.
`cf.s`	Return a time duration of seconds in a `cf.TimeDuration` object.

Resource management¶

`cf.configuration`	View or set any number of constants in the project-wide configuration.
`cf.chunksize`	Return a `Constant` instance during class creation.
`cf.display_data`	Control the display of data elements.
`cf.persist_data`	Control the persistence of computed data.
`cf.free_memory`	The available physical memory.
`cf.regrid_logging`	Whether or not to enable `esmpy` regridding logging.
`cf.tempdir`	The directory for internally generated temporary files.
`cf.total_memory`	The total amount of physical memory (in bytes).
`cf.CHUNKSIZE`	Alias for `cf.chunksize`.
`cf.FREE_MEMORY`	Alias for `cf.free_memory`.
`cf.REGRID_LOGGING`	Alias for `cf.regrid_logging`.
`cf.TEMPDIR`	Alias for `cf.tempdir`.
`cf.TOTAL_MEMORY`	Alias for `cf.total_memory`.

Active storage reductions¶

`cf.active_storage`	Whether or not to attempt active storage reductions.
`cf.active_storage_url`	The URL location of the active storage reducer.
`cf.active_storage_max_requests`	Concurrent active storage server requests per `dask` chunk.

Miscellaneous¶

`cf.CF`	The version of the CF conventions.
`cf.abspath`	Return a normalised absolute version of a path.
`cf.dirname`	Return the directory of a path.
`cf.dump`	Print a description of an object.
`cf.environment`	Return the names and versions of cf, cf-plot and their dependencies.
`cf.example_field`	Return an example field construct.
`cf.example_fields`	Return example field constructs.
`cf.example_domain`	Return an example domain construct.
`cf.flat`	Return an iterator over an arbitrarily nested sequence.
`cf.healpix_indexing_schemes`	The valid CF HEALPix indexing schemes.
`cf.healpix_max_refinement_level`	Return the maximum permitted HEALPix refinement level.
`cf.implementation`	Return a container for the CF data model implementation.
`cf.indices_shape`	Return the shape of the array subspace implied by indices.
`cf.inspect`	Inspect the attributes of an object.
`cf.log_level`	The minimal level of seriousness of log messages which are shown.
`cf.pathjoin`	Join two file path components intelligently.
`cf.relaxed_identities`	Use 'relaxed' mode when getting a construct identity.
`cf.relpath`	Return a relative filepath to a file.
`cf.load_stash2standard_name`	Load a STASH to standard name conversion table from a file.
`cf.stash2standard_name`	Return a copy of the loaded STASH to standard name conversion table.
`cf.unique_constructs`	Return the unique constructs from a sequence.
`cf.LOG_LEVEL`	Alias for `cf.log_level`.
`cf.RELAXED_IDENTITIES`	Alias for `cf.relaxed_identities`.

Deprecated¶

`cf.close_files`	Close open files containing sub-arrays of data arrays.
`cf.close_one_file`	Close an arbitrary open file containing a sub-array of a data array.
`cf.collapse_parallel_mode`	Which mode to use when collapse is run in parallel.
`cf.fm_threshold`	The amount of memory which is kept free as a temporary work space.
`cf.free_memory_factor`	Set the fraction of memory kept free as a temporary workspace.
`cf.hash_array`	Return a hash value of a numpy array.
`cf.min_total_memory`	The minimum total memory across nodes.
`cf.of_fraction`	The amount of concurrently open files above which files containing data arrays may be automatically closed.
`cf.open_files`	Return the open files containing sub-arrays of master data arrays.
`cf.open_files_threshold_exceeded`	Return True if the total number of open files is greater than the current threshold.
`cf.relative_vorticity`	Calculate the relative vorticity using centred finite differences.
`cf.set_performance`	Tune performance of parallelisation.
`cf.COLLAPSE_PARALLEL_MODE`	Alias for `cf.collapse_parallel_mode`.
`cf.FM_THRESHOLD`	Alias for `cf.fm_threshold`.
`cf.FREE_MEMORY_FACTOR`	Alias for `cf.free_memory_factor`.
`cf.MIN_TOTAL_MEMORY`	Alias for `cf.min_total_memory`.
`cf.OF_FRACTION`	Alias for `cf.of_fraction`.
`cf.SET_PERFORMANCE`	Alias for `cf.set_performance`.

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