/* method: shape() -- returns an array of shape of each rank */
static VALUE
 na_shape(VALUE self)
{
  struct NARRAY *ary;
  VALUE *shape;
  int i;

  GetNArray(self,ary);
  shape = ALLOCA_N(VALUE,ary->rank);
  for (i = 0; i < ary->rank; ++i)
    shape[i] = INT2FIX(ary->shape[i]);
  return rb_ary_new4(ary->rank,shape);
}