Algebra filter

La revisió el 14:53, 30 ago 2011 per Helen Foster (Discussió | contribucions) (improve template)

Dreceres ràpides: navegació, cerca

Aquesta pàgina forma part de la documentació de Moodle en català, tot i que no ha estat traduïda encara. Podeu contribuir obertament a les tasques de traducció. Podeu consultar la Guia d'edició de la documentació i també participar ens els debats del fòrum de traductors de la documentació a

This page really needs improving. Please see the page comments for suggestions of what to include, then remove this template when you're done.


Moodle has an "algebra filter" which can display mathematical expressions as if they were typeset. The filter is included in the standard Moodle packages but the administrator must activate it before you can use it.

NOTE that use of the algebra filter REQUIRES that the Moodle Tex filter also be working as the algebra filter simply parses math expressions in one syntax and then converts the expressions to LaTex expressions for the Tex filter to render and display. The filter uses a perl script borrowed from

The filter (see ) uses, a perl script (and its associated perl module, to parse text expressions delimited by double@ signs as tokens (though the tokens employed can be tweaked manually.)

While many have argued that the algebra filter is easy to use, there is apparently no Moodle reference on its "grammar" or "syntax". Research in to Webworks produced these two links for using webworks text expressions (the first one is arguably replaced by the second):


There is a discussion of Algebra filter syntax at offered by Zbigniew Fiedorowicz.

It appears that as of moving to Moodle 2 (late 2010) the Algebra filter in the forums is no longer working. It also appears that the Algebra filter does not work in Moodle Docs (which is not Moodle code, but MediaWiki, which I don't believe has a ready filter based on


The file algebradebug.php is provided in the filter folder for the purpose of debugging. Problems may arise comes from the first tags in algebradebug.php

define('NO_MOODLE_COOKIES', true); // Because it interferes with caching

You can delete the line or set it to false.