如何删除特定列重复的值不删除相关的行(How to remove duplicate values

想删除特定的列重复的值，但不删除重复的列值如下例所示的相关行：

Input
-----
    Date    Market      Quantity
4/2/2018    Indonesia   1000
4/2/2018    Australia   500
4/2/2018    India       300
4/2/2018    USA         500
4/2/2018    Germany     200
5/2/2018    India       400
5/2/2018    Japan       400
5/2/2018    Russia      457
6/2/2018    Austria     260
6/2/2018    Swiss       700
6/2/2018    USA         1200
6/2/2018    Indonesia   400


output
------
    Date    Market      Quantity
4/2/2018    Indonesia   1000
            Australia   500
            India       300
            USA         500
            Germany     200
5/2/2018    India       400
            Japan       400
            Russia      457
6/2/2018    Austria     260
            Swiss       700
            USA         1200
            Indonesia   400

如果可能的话，如何绘制了相同的输出曲线（巴/列）（类似给出）？ 样品图

Answer 1:

我想补充一点来评论，但我没有权利尚未...

我不认为你真的想改变数据，但在评论中提到的几个有简便的方法来做到这一点。

如果你只是想显示在plotly多维数据和你只是不熟悉图书馆的语法尝试下面的代码...

df <- data.frame(Date = c('2018/04/02','2018/04/02','2018/04/02','2018/04/02','2018/04/02','2018/05/02','2018/05/02','2018/05/02','2018/06/02','2018/06/02','2018/06/02','2018/06/02'),
  Market = c('Indonesia','Australia','India','USA','Germany','India','Japan','Russia','Austria','Swiss','USA','Indonesia'),
  Quantity = c(1000,500,300,500,200,400,400,457,260,700,1200,400),
  stringsAsFactors = F)

plotly::ggplotly(
      ggplot2::ggplot(df, ggplot2::aes(x=Market, y=Quantity)) +
        ggplot2::geom_col(ggplot2::aes(fill=Market))+
        ggplot2::facet_grid(~Date,scale='free_x') +
        ggthemes::theme_tufte()
      )

文章来源: How to remove duplicate values in specific column without removing related row