R-在循环中引用不同的数据帧 [英] R- Referencing different dataframes in a loop

问题描述

R我是全新的，所以如果我想到这个完全错误的话，可以随意告诉我。我有一系列关于发电厂的进口数据帧，每年都有一个（Plant1987，Plant1988等），我试图将这些数据帧最终结合成一个数据帧。在此之前，我想为每个数据框添加一个年变量。我可以为每个单独的数据框做到这一点，但想要正式化，并一步到位。我知道如何在stata中做到这一点，但我在这里挣扎。

我在想：

  for（y in 1987：2008）{
 paste（Plant，y，sep =）$ year < -  y 
 } 
  

这不起作用，因为粘贴显然不是正确的功能。有没有一个聪明，快捷的方法来做到这一点？谢谢

解决方案

试试这个..

  year = seq（1987,2008，by = 1）
 list_object_names = sprintf（Plant％s，1987：2008）
 
 list_DataFrame = lapply（list_object_names，get） 
 
 for（in 1：length（list_DataFrame））{
 list_DataFrame [[i]] [，'Year'] = year [i] 
} 
  

I am brand new to R so if I'm thinking about this completely wrong feel free to tell me. I have a series of imported dataframes on power plants, one of each year (Plant1987, Plant1988 etc...) that I am trying to combine ultimately into one data frame. Prior to doing so, I'd like to add a "year" variable to each dataframe. I could do this for each individual dataframe, but would like to formalize it and do it in one step. I know how to do it in stata, but I'm struggling here.

I was thinking something along the lines of:

for (y in 1987:2008) {
     paste("Plant",y,sep="")$year <- y
}

which doesn't work because paste is obviously not the right function. Is there a smart, quick way to do this? Thanks

解决方案

Try this ..

year=seq(1987,2008,by=1)
list_object_names = sprintf("Plant%s", 1987:2008)

list_DataFrame = lapply(list_object_names, get)

for (i in 1:length(list_DataFrame ) ){
    list_DataFrame[[i]][,'Year']=year[i]
}

这篇关于R-在循环中引用不同的数据帧的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！