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  External packages
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<p><a id="X84A2793F7A9F3E6A" name="X84A2793F7A9F3E6A"></a></p>
<div class="ChapSects"><a href="chap13_mj.html#X84A2793F7A9F3E6A">13 <span class="Heading">
  External packages
 </span></a>
<div class="ContSect"><span class="tocline"><span class="nocss"> </span><a href="chap13_mj.html#X7BD18FC581F0C4D3">13.1 <span class="Heading">
        Using external packages
    </span></a>
</span>
<div class="ContSSBlock">
<span class="ContSS"><br /><span class="nocss">  </span><a href="chap13_mj.html#X8736665E7CBEAB20">13.1-1 NumSgpsUse4ti2</a></span>
<span class="ContSS"><br /><span class="nocss">  </span><a href="chap13_mj.html#X875001717A8CF032">13.1-2 NumSgpsUse4ti2gap</a></span>
<span class="ContSS"><br /><span class="nocss">  </span><a href="chap13_mj.html#X875040237A692C3C">13.1-3 NumSgpsUseNormalize</a></span>
<span class="ContSS"><br /><span class="nocss">  </span><a href="chap13_mj.html#X7CD12ADD78089CBE">13.1-4 NumSgpsUseSingular</a></span>
<span class="ContSS"><br /><span class="nocss">  </span><a href="chap13_mj.html#X7F7699A9829940C2">13.1-5 NumSgpsUseSingularInterface</a></span>
</div></div>
</div>

<h3>13 <span class="Heading">
  External packages
 </span></h3>

<p>The use of the packages <code class="code">NormalizInterface</code> <a href="chapBib_mj.html#biBNmzInterface">[GHS14]</a> (an interface to <code class="code">Normalize</code> <a href="chapBib_mj.html#biBNormaliz">[BIRC14]</a>; or in its absence <code class="code">4ti2Interface</code><a href="chapBib_mj.html#biB4ti2Interface">[Gut]</a>, an interface to <code class="code">4ti2</code><a href="chapBib_mj.html#biB4ti2">[tt]</a>), <code class="code">SingularInterface</code> (an interface to <code class="code">Singular</code> <a href="chapBib_mj.html#biBSingular">[DGPS12]</a>; or in its absence <code class="code">Singular</code> <a href="chapBib_mj.html#biBSingularpackage">[CdG12]</a>) is highly recommended for many of the functions presented in this chapter. However, whenever possible a method not depending on these packages is also provided (though slower). The package tests if the user has downloaded any of the above packages, and if so puts <code class="code">NumSgpsCanUsePackage</code> to true, where <code class="code">Package</code> is any of the above.</p>

<p><a id="X7BD18FC581F0C4D3" name="X7BD18FC581F0C4D3"></a></p>

<h4>13.1 <span class="Heading">
        Using external packages
    </span></h4>

<p>As mentioned above some methods are specifically implemented to take advantage of several external packages. The following functions can be used in case these packages have not been loaded prior to <code class="code">numericalsgps</code>.</p>

<p><a id="X8736665E7CBEAB20" name="X8736665E7CBEAB20"></a></p>

<h5>13.1-1 NumSgpsUse4ti2</h5>

<div class="func"><table class="func" width="100%"><tr><td class="tdleft"><code class="func">‣ NumSgpsUse4ti2</code>(  )</td><td class="tdright">( function )</td></tr></table></div>
<p>Tries to load the package <code class="code">4ti2Interface</code>. If the package is available, then it also loads methods implemented using functions in this package.</p>

<p><a id="X875001717A8CF032" name="X875001717A8CF032"></a></p>

<h5>13.1-2 NumSgpsUse4ti2gap</h5>

<div class="func"><table class="func" width="100%"><tr><td class="tdleft"><code class="func">‣ NumSgpsUse4ti2gap</code>(  )</td><td class="tdright">( function )</td></tr></table></div>
<p>Tries to load the package <code class="code">4ti2gap</code>. If the package is available, then it also loads methods implemented using functions in this package.</p>

<p><a id="X875040237A692C3C" name="X875040237A692C3C"></a></p>

<h5>13.1-3 NumSgpsUseNormalize</h5>

<div class="func"><table class="func" width="100%"><tr><td class="tdleft"><code class="func">‣ NumSgpsUseNormalize</code>(  )</td><td class="tdright">( function )</td></tr></table></div>
<p>Tries to load the package <code class="code">NormalizInterface</code>. If the package is available, then it also loads methods implemented using functions in this package.</p>

<p><a id="X7CD12ADD78089CBE" name="X7CD12ADD78089CBE"></a></p>

<h5>13.1-4 NumSgpsUseSingular</h5>

<div class="func"><table class="func" width="100%"><tr><td class="tdleft"><code class="func">‣ NumSgpsUseSingular</code>(  )</td><td class="tdright">( function )</td></tr></table></div>
<p>Tries to load the package <code class="code">singular</code>. If the package is available, then it also loads methods implemented using functions in this package.</p>

<p>To prevent incompatibilities, the package will not load if <code class="code">SingularInterface</code> has been already loaded.</p>

<p><a id="X7F7699A9829940C2" name="X7F7699A9829940C2"></a></p>

<h5>13.1-5 NumSgpsUseSingularInterface</h5>

<div class="func"><table class="func" width="100%"><tr><td class="tdleft"><code class="func">‣ NumSgpsUseSingularInterface</code>(  )</td><td class="tdright">( function )</td></tr></table></div>
<p>Tries to load the package <code class="code">SingularInterface</code>. If the package is available, then it also loads methods implemented using functions in this package.</p>

<p>To prevent incompatibilities, the package will not load if <code class="code">singular</code> has been already loaded.</p>


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