我创建了一个将“ YYYYQQ”转换为整数YYYYMMDD的函数。该函数适用于列表中的单个值，但不适用于整个列表。我不明白警告消息。
GetProperDate <- function(x) {
x <- as.character(x)
q<-substr(x, 5, 6)
y<-substr(x, 1,4) %>% as.numeric()
if(q=="Q1"){
x <- as.integer(paste0(y,"03","31"))
}
if(q=="Q2"){
x <- as.integer(paste0(y,"06","30"))
}
if(q=="Q3"){
x <- as.integer(paste0(y,"09","30"))
}
if(q=="Q4"){
x <- as.integer(paste0(y,"12","31"))
}
return(x)
}
> GetProperDate("2019Q1")
[1] 20190331
> GetProperDate("2019Q2")
[1] 20190630
> GetProperDate("2019Q3")
[1] 20190930
> GetProperDate("2019Q4")
[1] 20191231
> date.list<-c("2019Q1","2019Q2","2019Q3","2019Q4")
> date.list.converted<- date.list %>% GetProperDate()
Warning messages:
1: In if (q == "Q1") { :
the condition has length > 1 and only the first element will be used
2: In if (q == "Q2") { :
the condition has length > 1 and only the first element will be used
3: In if (q == "Q3") { :
the condition has length > 1 and only the first element will be used
4: In if (q == "Q4") { :
the condition has length > 1 and only the first element will be used
> date.list.converted
[1] 20190331 20190331 20190331 20190331
>
如上所示，我收到警告消息，并且输出与预期不符。
library(tidyverse)
GetProperDate <- function(x) {
x <- as.character(x)
q <- substr(x, 5, 6)
y <- substr(x, 1,4) %>%
as.numeric()
x <- case_when(
q=="Q1" ~ as.integer(paste0(y,"03","31")),
q =="Q2" ~ as.integer(paste0(y,"06","30")),
q == "Q3" ~ as.integer(paste0(y,"09","30")),
TRUE ~ as.integer(paste0(y,"12","31")))
return(x)
}
date.list<-c("2019Q1","2019Q2","2019Q3","2019Q4")
GetProperDate(date.list)
> GetProperDate(date.list)
[1] 20190331 20190630 20190930 20191231
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