R 合并两个数据帧并删除重复的列

我想

cbind

两个数据帧并删除重复的列。例如：

df1 <- data.frame(var1=c('a','b','c'), var2=c(1,2,3))
df2 <- data.frame(var1=c('a','b','c'), var3=c(2,4,6))

cbind(df1,df2) #this creates a data frame in which column var1 is duplicated

---

df1
merge
将完成这项工作

尝试：

如果您继承了其他人的数据集，并以某种方式得到重复的列，并且希望处理这些列，那么这是一种很好的方法：

for (name in unique(names(testframe))) {
  if (length(which(names(testframe)==name)) > 1) {
    ## Deal with duplicates here. In this example
    ## just print name and column #s of duplicates:
    print(name)
    print(which(names(testframe)==name))
  }
}

这与所讨论的示例没有矛盾，但如果var1中存在偏差值，则将使用merge删除这些情况；e、 g.尝试
df2
for (name in unique(names(testframe))) {
  if (length(which(names(testframe)==name)) > 1) {
    ## Deal with duplicates here. In this example
    ## just print name and column #s of duplicates:
    print(name)
    print(which(names(testframe)==name))
  }
}