.. py:function:: xy_from_polar(magnitude, direction)
Converts vector data from meteorological polar representation to xy representation.
:param magnitude: the speed/magnitude
:type magnitude: number, ndarray or :class:`Fieldset`
:param direction: the meteorological direction of the vector in degrees
:type direction: number, ndarray or :class:`Fieldset`
:rtype: list or :class:`Fieldset` or None
In polar representation the data is specified by two components:
* ``magnitude``: represents the speed/magnitude
* ``direction``: represents the meteorological direction of the vector in degrees (see :func:`direction` for explanation)
In the target xy representation the x axis points East while the y axis points North.
The type of the result depends on the type of the input data:
* if the input is number the result is a list of two numbers
* if the input is ndarray the result is a list of two ndarrays, the first ndarray contains the x components while the second ndarray the y components
* if the input is :class:`Fieldset` the result is a fieldset where an x component field is immediately followed by the corresponding y component field.
.. note::
See also :func:`direction`.
.. mv-minigallery:: xy_from_polar