tr></table>

</dd></dl>

<dl>
<dt><a name="index-convert_005fto_005fsignum"></a><u>Function:</u> <b>convert_to_signum</b><i> (<var>e</var>)</i></dt>
<dd>
<p>This function replaces subexpressions of the form <em>abs(q), unit_step(q),
 min(q1,q2, ..., qn)</em> and <em>max(q1,q2, ..., qn)</em> by equivalent <em>signum</em>
terms.
</p>
<table><tr><td>&nbsp;</td><td><pre class="example"> (%i1) map('convert_to_signum, [abs(x), unit_step(x), max(a,2), min(a,2)]);
 (%o1) [x*signum(x),(signum(x)+1)/2,((a-2)*signum(a