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<h4 class="subsection">A.1.4 Cell Arrays in Oct-Files</h4>

<p>Octave's cell type is equally accessible within oct-files.  A cell
array is just an array of <code>octave_value</code>s, and so each element of the cell
array can then be treated just like any other <code>octave_value</code>.  A simple
example is

<pre class="example"><pre class="verbatim">     #include &lt;octave/oct.h>
     #include &lt;octave/Cell.h>
     
     DEFUN_DLD (celldemo, args, , "Cell Demo") 
     {
       octave_value_list retval;
       int nargin = args.length ();
     
       if (nargin != 1)
         print_usage ();
       else
         {
           Cell c = args (0).cell_value ();
           if (! error_state)
             for (octave_idx_type i = 0; i &lt; c.nelem (); i++)
               retval(i) = c.elem (i);
         }
     
       return retval;
     }
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   <p>Note that cell arrays are used less often in standard oct-files and so
the <samp><span class="file">Cell.h</span></samp> header file must be explicitly included.  The rest of this
example extracts the <code>octave_value</code>s one by one from the cell array and
returns be as individual return arguments.  For example consider

<pre class="example">     [b1, b2, b3] = celldemo ({1, [1, 2], "test"})
     &rArr;
     b1 =  1
     b2 =
     
        1   2
     
     b3 = test
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