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.. _tex-extpfeil:
########
extpfeil
########
The `extpfeil` extension adds more macros for producing extensible
arrows, including ``\xtwoheadrightarrow``, ``\xtwoheadleftarrow``,
``\xmapsto``, ``\xlongequal``, ``\xtofrom``, and a non-standard
``\Newextarrow`` for creating your own extensible arrows. The latter
has the form
.. describe:: \\Newextarrow{\\cs}{lspace,rspace}{unicode-char}
where ``\cs`` is the new control sequence name to be defined,
``lspace`` and ``rspace`` are integers representing the amount of
space (in suitably small units) to use at the left and right of
text that is placed above or below the arrow, and ``unicode-char``
is a number representing a unicode character position in either
decimal or hexadecimal notation.
For example
.. code-block:: latex
\Newextarrow{\xrightharpoonup}{5,10}{0x21C0}
defines an extensible right harpoon with barb up. Note that MathJax
knows how to stretch only a limited number of characters, so you may
not actually get a stretchy character this way. The characters that
can be stretched may also depend on the font you have selected.
This extension is loaded automatically when the `autoload` extension
is used. To load the `extpfeil` extension explicitly, add
``'[tex]/extpfeil'`` to the ``load`` array of the ``loader`` block of
your MathJax configuration, and add ``'extpfeil'`` to the ``packages``
array of the ``tex`` block.
.. code-block:: javascript
window.MathJax = {
loader: {load: ['[tex]/extpfeil']},
tex: {packages: {'[+]': ['extpfeil']}}
};
Alternatively, use ``\require{extpfeil}`` in a TeX expression to load it
dynamically from within the math on the page, if the `require`
extension is loaded.
-----
.. _tex-extpfeil-commands:
extpfeil Commands
-----------------
The `extpfeil` extension implements the following macros:
``\Newextarrow``, ``\xlongequal``, ``\xmapsto``, ``\xtofrom``, ``\xtwoheadleftarrow``, ``\xtwoheadrightarrow``
|-----|
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