add vectro funtion
add vectro funtion

omasanori/picrin,dcurrie/picrin,ktakashi/picrin,ktakashi/picrin,dcurrie/picrin,picrin-scheme/picrin,picrin-scheme/picrin,omasanori/picrin,ktakashi/picrin,leavesbnw/picrin,koba-e964/picrin,koba-e964/picrin,koba-e964/picrin,leavesbnw/picrin,leavesbnw/picrin