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我已经搜索了这个（看似简单的）问题的答案，但空无一物，所以我希望有人可以帮助我或指出我正确的方向。

我有一个相当复杂的子模型，我想将其应用于数据集，但如果我只使用 use mutate，我会收到错误，Variables must be length 1 or 21.添加 rowwise() 似乎不会影响它。

让我用下面这个愚蠢的例子来说明这个问题：

myData <- tibble(x=10:20, y=c("a", "b","a", "b","a", "b","a", "b","a", "b","a"))

staticData <- tibble(x=0:100, y=c("a"),f=x/100) %>% union (tibble(x=0:100, y=c("b"),f=x/1000))

ComplicatedFunction <- function(mystaticData, myx, myy) {
  #make the base table 
  myBaseTable <- tibble(
    y = myy,
    x = c(myx:(myx + 20)) 
  )
  #add  f rates
  myBaseTable <- left_join(myBaseTable,mystaticData)
  #add stuff
  myBaseTable <- myBaseTable %>% 
    mutate(z = 1 - (f * 0.8)) %>% 
    mutate(zCumulative = cumprod(z)) 
  #Calculate the thing
  myCalculatedThing <- sum(myBaseTable$zCumulative)

  return(myCalculatedThing)
}

#This is what I want to do 
myData %>% mutate(newcol = ComplicatedFunction(mystaticData = staticData, 
                                               myx = x, 
                                               myy = y))
#this works
ComplicatedFunction(mystaticData = staticData, 
                    myx = 19, 
                    myy = "b")
ComplicatedFunction(mystaticData = staticData, 
                    myx = 20, 
                    myy = "a")

#This works (but would be silly as I want the function to be evaluated for each line)
myData %>% mutate(newcol = ComplicatedFunction(mystaticData = staticData, 
                                               myx = 15, 
                                               myy = "a"))

#This no longer works, but I dont understand what I am doing wrong
myData %>% mutate(newcol = ComplicatedFunction(mystaticData = staticData, 
                                               myx = x, 
                                               myy = "a"))

#I tried rowwise(), but this doesnt seem to work either 
myData %>% rowwise() %>% mutate(newcol = ComplicatedFunction(mystaticData = staticData, 
                                               myx = x, 
                                               myy = y))

我希望有人可以向我解释我在这里做错了什么。

提前谢谢了！

西尔万

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1 回答 1

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您可以通过使用以下方法创建一个新函数来做到这一点partial：

library(purrr)
newCF <- partial(ComplicatedFunction, mystaticData = staticData)
myData %>% rowwise() %>% mutate(newcol = newCF(myx = x, 
                                           myy = y))
于 2017-05-05T16:56:07.187 回答