错误“ vec_assign”是什么：“ value”应该已经被回收以适应“ x”试图告诉我

问题描述

我有一个功能，可以进行一些基本的Web收集。成功登录后将调用此函数。（该网站已被屏蔽xxxxxx）

search <-function(HorseList){
  url <- "http://tnetwork.xxxxxx.com/tnet/HorseSearch.aspx"
  s <- GET(url)
  xxxxxx <- tibble(
    horse_name = character(),race_date = character(),race_nbr = character(),trk = character(),peak = character(),dist_run = character()
  )
  for (row in 1:nrow(HorseList))
  {
    
    url <-paste(c('http://tnetwork.xxxxxx.com/tnet/HorseSearchAPI.aspx?HorseName=',toString(HorseList[[row,1]])),collapse='')
    #print(url)
    h <- GET(url)
    temp<-content(h,"text")
    doc <- htmlParse(temp)
    horse_name <- HorseList[[row,1]]
    horse_ID <-xpathSApply(doc,"//*[@id=\"resultsDiv\"]/p[1]/a/@href")
    horse_ID <-substr(horse_ID,27,40)
    h_list <- list()
    c <- nchar(horse_ID)
    if (length(c)>0)
    {
      h_list[1] <- horse_ID
    }
    
    
    id_count <- length(h_list)
    
    for (k in 1:id_count)
    {
      url <-paste(c('http://tnetwork.xxxxxx.com/tnet/t_PastPerf.aspx?HorseID=',toString(h_list[k])),collapse='')
      t <- GET(url)
      temp <- content(t,"text")
      pastperf <- htmlParse(temp)
      row_count<-length(xpathSApply(pastperf,"//*[@id=\"pastPerftable\"]/tr"))
      
      for(j in 2:row_count)
      {
        j<- toString(j)
        race_data <- xpathSApply(pastperf,paste("//*[@id=\"pastPerftable\"]/tr[",j,"]/td[1][1]"),xmlValue)
        race_date <- substr(race_data,1,10)
        race_number <-trimws(substr(race_data,12,100))
        horse_name <- URLdecode(toString(horse_name))
        race_nbr = str_match(race_number,'(Race\\s\\d+)(.*)')[,2]
        trk = str_match(race_number,3]
        peak <-xpathSApply(pastperf,"]/td[13]"),xmlValue)
        cum_distance <-xpathSApply(pastperf,"]/td[14]"),xmlValue)
        newrow <- paste(horse_name,',race_date,race_nbr,trk,peak,cum_distance)
        xxxxxx <- add_row(trakus,horse_name = horse_name,race_date = race_date,race_nbr = race_nbr,trk=trk,peak = peak,dist_run = cum_distance)
      }
    }
  }
  
  return(xxxxxx)
}

该函数过去曾成功运行过，但今天却引发以下错误：

Error: Internal error in `vec_assign()`: `value` should have been recycled to fit `x`.

我运行了rlang :: last_error（）和last_trace（）命令来获得更多的见解，但是我仍然不确定发生了什么。

> rlang::last_error()
<error/rlang_error>
Internal error in `vec_assign()`: `value` should have been recycled to fit `x`.
Backtrace:
 1. base::source("~/TimeForm/Scripts/past_perf.R",echo = TRUE)
 6. global::search(horse_list) ~/TimeForm/Scripts/past_perf.R:627:2
 7. tibble::add_row(...) ~/TimeForm/Scripts/past_perf.R:85:8
 8. tibble:::rbind_at(.data,df,pos)
 9. vctrs::vec_rbind(old,new)
Run `rlang::last_trace()` to see the full context.

> rlang::last_trace()
<error/rlang_error>
Internal error in `vec_assign()`: `value` should have been recycled to fit `x`.
Backtrace:
     x
  1. +-base::source("~/TimeForm/Scripts/past_perf.R",echo = TRUE)
  2. +-base::source("~/TimeForm/Scripts/past_perf.R",echo = TRUE)
  3. | +-base::withVisible(eval(ei,envir))
  4. | \-base::eval(ei,envir)
  5. |   \-base::eval(ei,envir)
  6. \-global::search(horse_list) ~/TimeForm/Scripts/past_perf.R:627:2
  7.   \-tibble::add_row(...) ~/TimeForm/Scripts/past_perf.R:85:8
  8.     \-tibble:::rbind_at(.data,pos)
  9.       \-vctrs::vec_rbind(old,new)
 10.         \-(function () ...

在我的代码中似乎出现了add_row（）行，但我不确定该错误说明了什么或如何解决。有没有人可以分享任何见识？

解决方法

我发现问题出现在处理空字符字段、空值或使用NA。问题已通过 map_if 替换空值得到纠正。

    map_depth(.depth = 1,map_if,is_empty,~paste0(""))

当然，您需要调整深度命令以在适合您的列表结构的级别进行更正。

理想情况下，bind_rows() 可以更稳健地处理包含 NA 或 NULL 值的向量。