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<head><title>MV-NTH.html -- ACL2 Version 3.1</title></head>
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<h2>MV-NTH</h2>the mv-nth element (zero-based) of a list
<pre>Major Section: <a href="PROGRAMMING.html">PROGRAMMING</a>
</pre><p>
<code>(Mv-nth n l)</code> is the <code>n</code>th element of <code>l</code>, zero-based. If <code>n</code> is
greater than or equal to the length of <code>l</code>, then <code>mv-nth</code> returns
<code>nil</code>.
<p>
<code>(Mv-nth n l)</code> has a <a href="GUARD.html">guard</a> that <code>n</code> is a non-negative integer and
<code>l</code> is a <code><a href="TRUE-LISTP.html">true-listp</a></code>.<p>
<code>Mv-nth</code> is equivalent to the Common Lisp function <code><a href="NTH.html">nth</a></code>, but is used by
ACL2 to access the nth value returned by a multiply valued expression. For
an example of the use of <code>mv-nth</code>, try
<pre>
ACL2 !>:trans1 (mv-let (erp val state)
(read-object ch state)
(value (list erp val)))
</pre>
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