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<title>GAP (NumericalSgps) - Appendix C: A graphical interface</title>
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<div class="ChapSects"><a href="chapC.html#X7E34378C7C333327">C <span class="Heading">A graphical interface</span></a>
<div class="ContSect"><span class="nocss"> </span><a href="chapC.html#X86EF7EAB809D2418">C.1 <span class="Heading">Graphical interface</span></a>
<span class="ContSS"><br /><span class="nocss"> </span><a href="chapC.html#X82616EED7F480035">C.1-1 XNumericalSemigroup</a></span>
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<h3>C <span class="Heading">A graphical interface</span></h3>
<p>Here we describe a Tcl/Tk interface to specify numerical semigroups.</p>
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<h4>C.1 <span class="Heading">Graphical interface</span></h4>
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<h5>C.1-1 XNumericalSemigroup</h5>
<div class="func"><table class="func" width="100%"><tr><td class="tdleft"><code class="func">> XNumericalSemigroup</code>( <var class="Arg">[s]</var> )</td><td class="tdright">( function )</td></tr></table></div>
<p>This function pops up a Tcl/Tk window which allows the specification of numerical semigroups. The optional argument <var class="Arg">s</var> is a numerical semigroup whose definition becomes displayed in the graphical interface.</p>
<p>The interface is very simple, it allows to specify a numerical semigroup by its generators or a (proportionally) modular numerical semigroup by its (proportionally) modular condition. The <strong class="pkg">GAP</strong> variable by which the semigroup will be known must also be specified.</p>
<p>The interface also allows to apply some functions to the semigroup, namely <code class="func">AperyListOfNumericalSemigroupWRTElement</code> (<a href="chap3.html#X86C699F2800F9ED0"><b>3.1-5</b></a>), <code class="func">DrawAperyListOfNumericalSemigroup</code> (<a href="chap3.html#X85C89A6B81A07061"><b>3.1-6</b></a>), <code class="func">SmallElementsOfNumericalSemigroup</code> (<a href="chap3.html#X79D6E4727B612B54"><b>3.1-3</b></a>), <code class="func">GapsOfNumericalSemigroup</code> (<a href="chap3.html#X7B1BEC5786C66244"><b>3.3-1</b></a>), <code class="func">FrobeniusNumberOfNumericalSemigroup</code> (<a href="chap3.html#X7828CD2B83E380FA"><b>3.2-1</b></a>) and <code class="func">MinimalPresentationOfNumericalSemigroup</code> (<a href="chap4.html#X7D8199858781EB41"><b>4.1-2</b></a>). Finally, it is also possible to add functions to this list and remove them.</p>
<table class="example">
<tr><td><pre>
gap> s:=RandomNumericalSemigroup(3,9);
<Numerical semigroup with 3 generators>
gap> XNumericalSemigroup(s);
</pre></td></tr></table>
<p>This would pop up the following window:</p>
<p><br><center><img src="xnumsgp.png"></center><br></p>
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