double non_expert(const double *array, int len)
{
  double val, tolerance;
  double *scratch;

  /* set default tolerance value */
  tolerance = 1e-6;
  /* allocate scratch */
  scratch = (double *)malloc((size_t)len);
  if ( scratch == NULL )
    /* error! */ ;

  val = expert(array,len,tolerance,scratch);

  /* de-allocate scratch */
  free(scratch);

  return val;
}