根据R中另一个数据帧内的列从数据帧中删除变量

Question

I want to remove a number of columns from df1

  | A      | B      | C      | D
  | ------ | ------ | ------ | ------
1 | 0.870  | 0.435  | 0.968  | 0.679
2 | 0.456  | 0.259  | 0.906  | 0.467
3 | 0.298  | 0.256  | 0.457  | 0.768
4 | 0.994  | 0.987  | 0.365  | 0.765

if they appear as values within a column called TEST within df2

  | TEST   |  
  | ------ | 
1 | A      | 
2 | B      | 

Answer 1

df1[,!(colnames(df1) %in% df2$TEST)]

Answer 2

对我有用的评论的答案是：

newDF = df1[, -which(colnames(df1) %in% df2$TEST)] 

Answer 3

我们也可以使用setdiff

 df1[setdiff(names(df1), df2$TEST)]