在 R 中使用带有两个变量的 apply 扩展文本

Question

我需要在 R 中使用两个变量制作一小段文本。我有以下数据：

library(dplyr)
VAR <- c("Age", "Condition", "Condition2")
FIELDS <- c("", "Option1;Option2", "Set1;Set2")

df <- cbind(VAR, FIELDS) %>%
  as_data_frame()

还有一个循环写入文本的函数：

extending <- function(x, VAR){
  VARZ <- VAR[!is.na(x)]
  sapply(x, function(x){
    if(!is.na(x)){
      VARZ <- "XXXXX"
      opciones <-  strsplit(x, ";") 
      opciones <- opciones[[1]]
      opciones2 <- paste(
        "From ", VARZ, " here's ", opciones,
        sep=""
      )
    } else {
      opciones2 <- ""
    }
    opciones2
  })
}

当我使用带有两个变量的函数时：

extending(df$FIELDS, df$VAR)

结果是这样的：

# result 1
[[1]]
[1] "From XXXXX here's "

$`Option1;Option2`
[1] "From XXXXX here's Option1" "From XXXXX here's Option2"

$`Set1;Set2`
[1] "From XXXXX here's Set1" "From XXXXX here's Set2"

我想要得到的是以下内容：

# result 2
[[1]]
[1] "From Age here's "

$`Option1;Option2`
[1] "From Condition here's Option1" "From Condition here's Option2"

$`Set1;Set2`
[1] "From Condition2 here's Set1" "From Condition2 here's Set2"

但如果我禁用VARZ <- "XXXXX" 行，我会得到完全不同的东西：

# result 3
                               Option1;Option2                  Set1;Set2                    
[1,] "From Age here's "        "From Age here's Option1"        "From Age here's Set1"       
[2,] "From Condition here's "  "From Condition here's Option2"  "From Condition here's Set2" 
[3,] "From Condition2 here's " "From Condition2 here's Option1" "From Condition2 here's Set1"

我尝试了一些变化，但以更奇怪的结果结束，并且不太了解我在做什么。

这是否是一种编写循环的方法，该循环以“正确”的方式重用每个变量来编写 # result 2 块中的文本？

Answer 1

这是一个快速的基本 r 代码：

 VAR <- c("Age", "Condition", "Condition2")
 FIELDS=c(" ", "Option1;Option2", "Set1;Set2")
 Map(function(x,y)paste("from",x,"here's",y),VAR,strsplit(FIELDS,";"))

 $Age
 [1] "from Age here's  "

 $Condition
 [1] "from Condition here's Option1" "from Condition here's Option2"

 $Condition2
 [1] "from Condition2 here's Set1" "from Condition2 here's Set2"

当然，您可以缩短代码，前提是您对名称不感兴趣：您可以稍后设置

 Map(paste,"from",VAR,"here's",strsplit(FIELDS,";"))