R合并2个具有相似变量的数据帧

Question

Is it possible to merge two data.frame without having exactly the same variables in the two df.

Example:

df1 <-  data.frame(C=c("1Q","4R"),B= c("A","plane"))
df <-  data.frame(A=c(1,2),B=c("A (Inc", "plane (Inc)"))

> df
#  A           B
#1 1      A (Inc
#2 2 plane (Inc)

> df1
#   C     B
#1 1Q     A
#2 4R plane

Is it possible to merge df1 and df? Here I don't want to pre-modify the data in the dfs for the match to occur. I'm would like the merge to discard the (Inc), while keeping it in the dfs. An obvious soluion in this dumb example would be cbind() , but it's really the merge that I'm looking for.

My merged data.frame would be:

df

#    C     B A           B
# 1 1Q     A 1      A (Inc
# 2 4R plane 2 plane (Inc)

Answer 1

You can proceed like this:

> merge(df1,transform(df, B = gsub("[[:space:]]*\\(Inc.*$","",df$B), B1=df$B))
      B  C A          B1
1     A 1Q 1      A (Inc
2 plane 4R 2 plane (Inc)