: none
</p>
<p>If a user wishes to have a default unit behavior other than that described,
they can make use of <em>maxima-init.mac</em> and the <em>usersetunits</em>
variable.  The <em>unit</em> package will check on startup to see if this variable
has been assigned a list.  If it has, it will use setunits on that list and take
the units from that list to be defaults.  <code>uforget</code> will revert to the
behavior defined by usersetunits over its own defaults.  For example, if we
have a <em>maxima-init.