noundefined

.. _tex-noundefined:

########### noundefined ###########

The noundefined extension causes undefined control sequences to be shown as their macro names rather than generating error messages. So $X_{\xyz}$ would display as an "X" with a subscript consisting of the text \xyz in red.

This extension is already loaded in all the components that include the TeX input jax, other than input/tex-base. To load the ams extension explicitly (when using input/tex-base for example), add '[tex]/noundefined' to the :data:load array of the :data:loader block of your MathJax configuration, and add 'noundefined' to the :data:packages array of the :data:tex block.

.. code-block:: javascript

window.MathJax = { loader: {load: ['[tex]/noundefined']}, tex: {packages: {'[+]': ['noundefined']}} };

Since the noundefined extension is included in the combined components that contain the TeX input jax, it may already be in the package list. In that case, if you want to disable it, you can remove it:

.. code-block:: javascript

window.MathJax = { tex: {packages: {'[-]': ['noundefined']}} };

---

.. _tex-noundefined-options:

noundefined Options

Adding '[tex]/noundefined' to the :data:packages array defines a :data:noundefined sub-block of the :data:tex configuration block with the following values:

.. code-block:: javascript

MathJax = { tex: { noundefined: { color: 'red', background: '', size: '' } } };

.. _tex-noundefined-color: .. describe:: color: 'red'

This gives the color to use for the text of the undefined macro name, or an empty string to make the color the same as the surrounding mathematics.

.. _tex-noundefined-background: .. describe:: background: ''

This gives the color to use for the background for the undefined macro name, or an empty string to have no background color.

.. _tex-noundefined-size: .. describe:: size: ''

This gives the size to use for the undefined macro name (e.g., 90% or 12px), or an empty string to keep the size the same as the surrounding mathematics.

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