数据如下：
income infant region oil
Australia 3426 26.7 Asia no
Austria 3350 23.7 Europe no
Belgium 3346 17.0 Europe no
Canada 4751 16.8 Americas no
Denmark 5029 13.5 Europe no
Finland 3312 10.1 Europe no
France 3403 12.9 Europe no
West.Germany 5040 20.4 Europe no
Ireland 2009 17.8 Europe no
想要只删掉France一行，但使用data<-data[data$row.names != "France", ]系统说不行，求问！