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<html><head><title>XLISP make-array</title>
<link rel="stylesheet" type="text/css" href="reference.css">
</head>
<body>
<a href="../start.htm">Nyquist / XLISP 2.0</a> -
<a href="../manual/contents.htm">Contents</a> |
<a href="../tutorials/tutorials.htm">Tutorials</a> |
<a href="../examples/examples.htm">Examples</a> |
<a href="reference-index.htm">Reference</a>
<hr>
<h1>make-array</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>xlbfun.c</nobr></td>
</tr>
</tbody></table></p>
<h2>Syntax</h2>
<dl>
<dt>(make-array <i>size</i>)</dt>
<dd><i>size</i> - the size [integer] of the array to be created<br>
returns - the new array</dd>
</dl>
<h2>Description</h2>
<p>The 'make-array' function creates an array of the specified size and
returns the array. Array elements may be any valid lisp data type, including
lists or arrays. Arrays made by 'make-array' and accessed by
<a href="aref.htm">aref</a> are <nobr>base 0.</nobr> This means
the first element is accessed by element number '0' and the last element is
accessed by element number 'n-1', where 'n' is the array size. Array
elements are initialized to <a href="nil.htm">NIL</a>.</p>
<h2>Examples</h2>
<pre class="example">
(setq my-array (make-array 16)) <font color="#008844">; make the array</font>
(aref my-array 0) <font color="#008844">; return 0th (first) element</font>
(aref my-array 15) <font color="#008844">; return 15th (last) element</font>
(aref my-array 16) <font color="#008844">; error: non existant element</font>
(dotimes (i 16) <font color="#008844">; set each element to its index</font>
(setf (aref my-array i) i)) <font color="#008844">; by the setf function</font>
(setq new (make-array 4)) <font color="#008844">; make another array</font>
(setf (aref new 0) (make-array 4)) <font color="#008844">; make new[0] an array of 4</font>
(setf (aref (aref new 0) 1) 'a) <font color="#008844">; set new[0,1] = 'a</font>
(setf (aref new 2) '(a b c)) <font color="#008844">; set new[2] = '(a b c)</font>
my-array <font color="#008844">; look at array</font>
</pre>
<p><b>Read macro:</b> There is a built-in read-macro for arrays, '#(...)'
[the hash symbol with an opening and a closing parenthesis]. This allows you
to create arbitrary arrays with initial values without going through a
'make-array' function. There is also the XLISP <a
href="vector.htm">vector</a> function to create initialized arrays.</p>
<p><b>Common Lisp:</b> Common Lisp supports multi-dimensional arrays, XLISP
only supports one-dimensional arrays. In XLISP, multi-dimenstional arrays
can be created by using 'arrays within arrays'. Common Lisp supports various
keyword parameters that are not supported in XLISP.</p>
<p>See the
<a href="../manual/xlisp-man-015.htm#make-array">make-array</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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