/* method: flatten! */
static VALUE
 na_flatten_bang(VALUE self)
{
  struct NARRAY *ary;

  GetNArray(self,ary);
  if (ary->total==0 || ary->rank==0)
    rb_raise(rb_eRuntimeError, "cannot reshape empty array");
  ary->shape[0] = ary->total;
  ary->rank = 1;
  return self;
}