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.. currentmodule:: astropy
****************
Astropy Glossary
****************
.. glossary::
(`n`,)
A parenthesized number followed by a comma denotes a tuple with one
element. The trailing comma distinguishes a one-element tuple from a
parenthesized ``n``.
This is from NumPy; see https://numpy.org/doc/stable/glossary.html.
number
Any numeric type. eg float or int or any of the ``numpy.number``.
-like
Used to indicate on object of that type or that can instantiate the type.
E.g. :class:`~astropy.units.Quantity`-like includes ``"2 * u.km"``
because ``astropy.units.Quantity("2 * u.km")`` works.
unit-like
Must be an :class:`~astropy.units.UnitBase` (subclass) instance or a
string or other instance parseable by :class:`~astropy.units.Unit`.
quantity-like
Must be an `~astropy.units.Quantity` (or subclass) instance or a string
parseable by `~astropy.units.Quantity`.
Note that the interpretation of units in strings depends on the class --
``Quantity("180d")`` is 180 **days**, while ``Angle("180d")`` is 180
**degrees** -- so check the string parses as intended for ``Quantity``.
['physical type']
The physical type of a quantity can be annotated in square brackets
following a `~astropy.units.Quantity` (or similar :term:`quantity-like`).
For example, ``distance : quantity-like ['length']``
angle-like
:term:`quantity-like`, but interpreted by an angular
`~astropy.units.SpecificTypeQuantity`, like `~astropy.coordinates.Angle`
or `~astropy.coordinates.Longitude` or `~astropy.coordinates.Latitude`.
Note that the interpretation of units in strings depends on the class --
``Quantity("180d")`` is 180 days, while ``Angle("180d")`` is 180 degrees
-- so make sure the string parses as intended for ``Angle``.
length-like
:term:`quantity-like`, but interpretable by
:class:`~astropy.coordinates.Distance`.
frame-like
A :class:`~astropy.coordinates.BaseCoordinateFrame` subclass instance or a
string that can be converted to a Frame by
:class:`~astropy.coordinates.sky_coordinate_parsers._get_frame_class`.
coordinate-like
A Coordinate-type object such as a
:class:`~astropy.coordinates.BaseCoordinateFrame` subclass instance or a
:class:`~astropy.coordinates.SkyCoord` (or subclass) instance.
table-like
An astropy :class:`~astropy.table.Table` or any object that can
initialize one. Anything marked as table-like will be processed through
a :class:`~astropy.table.Table`.
time-like
:class:`~astropy.time.Time` or any valid initializer.
buffer-like
Anything that implements Python's buffer protocol. See
https://docs.python.org/3/c-api/buffer.html#bufferobjects
writable file-like object
In the context of a :term:`python:file-like object` object, anything
that supports writing with a method ``write``.
readable file-like object
In the context of a :term:`python:file-like object` object, anything
that supports writing with a method ``read``.
***************************
Optional Packages' Glossary
***************************
.. currentmodule:: matplotlib.pyplot
.. glossary::
color
Any valid Matplotlib color.
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