>names(sourcedata) <- "Date" "A" "B" "k1" "k2"<br />
>smp <- sourcedata[!duplicated(data.frame(sourcedata$A,sourcedata$B)),]
</p>
>names(sourcedata) <- "Date" "A" "B" "k1" "k2"<br />
>smp <- subset[sourcedata,!duplicated(sourcedata$A,sourcedata$B),]
</p>
试了以上两个写法都行不通,我想要去除掉数据中重复的A和B,结果还是一样出现重复数据,请问该怎么删除掉双重条件的重复元素呢?