Is there memory leak in this approach?

[babelproofreader]

I have written many .oct functions which require numerous arrays/vectors to
hold internal calculations, but which output perhaps just a few of these
arrays/vectors as return values. A simplistic example is:

DEFUN_DLD (complex_function, args, , "Help String")
{
  octave_value retval;
  ColumnVector input = args(0).column_vector_value ();
  ColumnVector internal_vector_1 = args(0).column_vector_value ();
  ColumnVector internal_vector_2 = args(0).column_vector_value ();
  ColumnVector internal_vector_3 = args(0).column_vector_value ();
  ColumnVector output = args(0).column_vector_value ();

   for (octave_idx_type ii (0); ii < input.length(); ii++)
       { 
        main code loops and writes to internal_vector_1, internal_vector_2
        & internal_vector_3 during course of calculations, and final result
is
        written to output      
       } 

  retval = output;
  return retval;
}

My concern is: What happens to the internal_vectors? Do I need to clean them
up in some way or is the memory they occupy automatically released once the
function exits?

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