# cf.Field.domain_axis_position¶

Field.domain_axis_position(identity)[source]

Return the position in the data of a domain axis construct.

New in version 3.0.0.

Parameters: identity: Select the domain axis construct by one of: An identity or key of a 1-d coordinate construct that whose data spans the domain axis construct. A domain axis construct identity or key. The position of the domain axis construct in the field construct’s data. A construct identity is specified by a string (e.g. 'latitude', 'long_name=time', 'ncvar%lat', etc.); or a compiled regular expression (e.g. re.compile('^atmosphere')) that selects the relevant constructs whose identities match via re.search. Each construct has a number of identities, and is selected if any of them match any of those provided. A construct’s identities are those returned by its identities method. In the following example, the construct x has six identities: >>> x.identities() ['time', 'long_name=Time', 'foo=bar', 'standard_name=time', 'ncvar%t', 'T']  A construct key may optionally have the 'key%' prefix. For example 'dimensioncoordinate2' and 'key%dimensioncoordinate2' are both acceptable keys. A position of a domain axis construct in the field construct’s data is specified by an integer index. Note that in the output of a print call or dump method, a construct is always described by one of its identities, and so this description may always be used as an identity argument. Parameter example: identity='long_name=Latitude' Parameter example: identity='dimensioncoordinate1' Parameter example: identity='domainaxis2' Parameter example: identity='key%domainaxis2' Parameter example: identity='ncdim%y' Parameter example: identity=2 int The position in the field construct’s dat of the selected domain axis construct.

Examples:

>>> f
<CF Field: air_temperature(time(12), latitude(64), longitude(128)) K>
>>> f.get_data_axes()
('domainaxis0', 'domainaxis1', 'domainaxis2')
>>> f.domain_axis_position('T')
0
>>> f.domain_axis_position('latitude')
1
>>> f.domain_axis_position('domainaxis1')
1
>>> f.domain_axis_position(2)
2
>>> f.domain_axis_position(-2)
1