/* * call-seq: * dvector.where_last_min -> int or nil * * Returns the index of the last entry with the minimum value in _dvector_, <code>nil</code> if * _dvector_ is empty. * * a = Dvector[ 1, 2, -3, 4, -5, 4, 3, -5, 2 ] * a.where_last_min -> 7 * Dvector[].where_last_min -> nil */ VALUE dvector_where_last_min(VALUE ary) {