合并数据框中的行[某些字段重复]

Question

我有3列。 name，review，part in data.frame（set）

        name     review             part
 1      abc      this is good       cap   
 2      abc      this is not bad    cap
 3      abc      this is also good  cap

我希望最终结果如下：

       name     review                 part
  1    abc      this is good this      cap
                is not bad this is 
                also good

Answer 1

假设您的列属于character类，您可以执行以下操作：

df[sapply(df, duplicated)] <- ""
> df
#  name            review part
#1  abc      this is good  cap
#2        this is not bad     
#3      this is also good    

Answer 2

假设“审核”列是因子类型

require(plyr)
df$review <- as.character(df$review)

ddply(df, .(name, part), summarize, review = paste(review, collapse = " "))[,c(1,3,2)]