Octave’s cell type is also available from within oct-files. A cell array is
just an Array of octave_values, and thus each element of the cell
array can be treated like any other octave_value. A simple example is
#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;
}
Note that cell arrays are used less often in standard oct-files and so the
Cell.h header file must be explicitly included. The rest of the example
extracts the octave_values one by one from the cell array and returns
them as individual output arguments. For example:
[b1, b2, b3] = celldemo ({1, [1, 2], "test"})
⇒
b1 = 1
b2 =
1 2
b3 = test