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<span id="Cell-Arrays-in-Oct_002dFiles-1"></span><h4 class="subsection">A.1.4 Cell Arrays in Oct-Files</h4>
<p>Octave’s cell type is also available from within oct-files. A cell array is
just an <code>Array</code> of <code>octave_value</code>s, and thus each element of the cell
array can be treated like any other <code>octave_value</code>. A simple example is
</p>
<div class="example">
<pre class="verbatim">#include <octave/oct.h>
#include <octave/Cell.h>
DEFUN_DLD (celldemo, args, , "Cell Demo")
{
if (args.length () != 1)
print_usage ();
Cell c = args(0).cell_value ();
octave_value_list retval;
retval.resize (c.numel ()); // faster code by pre-declaring size
for (octave_idx_type i = 0; i < c.numel (); i++)
{
retval(i) = c(i); // using operator syntax
//retval(i) = c.elem (i); // using method syntax
}
return retval;
}
</pre></div>
<p>Note that cell arrays are used less often in standard oct-files and so the
<samp>Cell.h</samp> header file must be explicitly included. The rest of the example
extracts the <code>octave_value</code>s one by one from the cell array and returns
them as individual output arguments. For example:
</p>
<div class="example">
<pre class="example">[b1, b2, b3] = celldemo ({1, [1, 2], "test"})
⇒
b1 = 1
b2 =
1 2
b3 = test
</pre></div>
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