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<html><head><title>XLISP subseq</title>
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</head>
<body>
<a href="../start.htm">Nyquist / XLISP 2.0</a> -
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<hr>
<h1>subseq</h1>
<hr>
<p><table cellpadding="0" cellspacing="0" style="margin-left:10px"><tbody>
<tr valign="top">
<td><nobr>Type:</nobr></td>
<td><nobr> - </nobr></td>
<td width="100%"><nobr>function (subr)</nobr></td>
</tr>
<tr valign="top">
<td><nobr>Source:</nobr></td>
<td><nobr> - </nobr></td>
<td width="100%"><nobr>xlstr.c</nobr></td>
</tr>
</tbody></table></p>
<h2>Syntax</h2>
<dl>
<dt>(subseq <i>string start</i> [<i>end</i>])</dt>
<dd><i>string</i> - a string expression<br>
<i>start</i> - an integer expression<br>
<i>end</i> - an integer expression<br>
returns - the substring between <i>start</i> and <i>end</i></dd>
</dl>
<h2>Description</h2>
<p> The 'subseq' function extracts a substring from 'string' starting with
the 'start' offset and ending with the 'end' offset. The 'start' offset has
a origin or 0. The substring is returned.</p>
<h2>Examples</h2>
<pre class="example">
(subseq "12345678" 0) <font color="#008844">; returns "12345678"</font>
(subseq "12345678" 2) <font color="#008844">; returns "345678"</font>
(subseq "12345678" 2 4) <font color="#008844">; returns "34"</font>
(subseq "1234" 3) <font color="#008844">; returns "4"</font>
(subseq "1234" 4) <font color="#008844">; returns ""</font>
(subseq "1234" 4 2) <font color="#008844">; returns ""</font>
(subseq "1234" 5) <font color="#008844">; error: string index out of bounds - 5</font>
</pre>
<p><b>Common Lisp:</b> The 'subseq' function in Common Lisp is intended to
return a portion of a sequence, a sub-sequence. This function operates on
lists and vectors [one-dimensional arrays of data], basically ordered data.
Strings are just one of the valid types operated on by 'subseq' in Common
Lisp. The XLISP 'subseq' function only operates on strings.</p>
<p>See the
<a href="../manual/xlisp-man-025.htm#subseq">subseq</a>
function in the <nobr>XLISP 2.0</nobr> manual.</p>
<p><nobr> <a href="#top">Back to Top</nobr></a></p>
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