在R中使用带日期的ifelse [英] using ifelse with Dates in R
问题描述
我有一个日期向量,如果要早于另一个向量,我想将日期设置为NA.
我尝试了 ifelse(date_vector1> = date_vector2,date_vector1,NA)
,但是输出不是Date,并且应用了 as.Date()
返回错误./p>
然后我尝试了 dplyr :: if_else(date_vector1> = date_vector2,date_vector1,NA_real _)
,但它返回了相同的错误.
错误是这个:
as.Date.numeric(value)中的错误:必须提供'origin'
如何在日期中使用 ifelse
语句?
我们可以使用 data.table
创建新列
库(data.table)setDT(df1)[date_vector1> = date_vector2,newcol:= date_vector1]df1#date_vector1 date_vector2 newcol#1:2017-05-29 2017-05-13 2017-05-29#2:2017-05-22 2017-05-26< NA>#3:2017-05-26 2017-05-18 2017-05-26#4:2017-05-28 2017-05-14 2017-05-28#5:2017-05-25 2017-05-27< NA>
如果这两个向量都不是data.frame/data.table中的变量,请这样做
i1<-date_vector1> = date_vector2newvector<-date_vector2newvector [i1]<-date_vector1 [i1]newvector [!i1]<-NA新向量#[1]" 2017-05-29"NA"2017-05-26";" 2017-05-28"不适用
最好不要在 Date
上使用 ifelse
,因为日期存储为整数,它将强制转换为 integer
类,我们可能不得不再次使用 as.Date(...,origin ='1970-01-01')
Date
类数据
set.seed(24)date_vector1<-sample((Sys.Date()-1:10),5,replace = FALSE)date_vector2<-sample((Sys.Date()-1:20),5,replace = FALSE)df1<-data.frame(date_vector1,date_vector2)
I have a vector of dates and I want to set the date to NA if it is prior to another vector.
I tried ifelse(date_vector1>=date_vector2, date_vector1, NA)
, but the output is not a Date and applying as.Date()
return an error.
I then tried dplyr::if_else(date_vector1>=date_vector2, date_vector1, NA_real_)
, but it returns the same error.
The error is this one :
Error in as.Date.numeric(value) : 'origin' must be supplied
How can I use the ifelse
statement with dates ?
We can use data.table
to create a new column
library(data.table)
setDT(df1)[date_vector1>= date_vector2, newcol := date_vector1]
df1
# date_vector1 date_vector2 newcol
#1: 2017-05-29 2017-05-13 2017-05-29
#2: 2017-05-22 2017-05-26 <NA>
#3: 2017-05-26 2017-05-18 2017-05-26
#4: 2017-05-28 2017-05-14 2017-05-28
#5: 2017-05-25 2017-05-27 <NA>
If both these are vectors are not a variable in a data.frame/data.table, then do
i1 <- date_vector1>= date_vector2
newvector <- date_vector2
newvector[i1] <- date_vector1[i1]
newvector[!i1] <- NA
newvector
#[1] "2017-05-29" NA "2017-05-26" "2017-05-28" NA
It is better not to use ifelse
on Date
as dates are stored as integers it will coerce to integer
class and we may have to convert it back to Date
class again with as.Date(..., origin = '1970-01-01')
data
set.seed(24)
date_vector1 <- sample((Sys.Date() - 1:10), 5, replace = FALSE)
date_vector2 <- sample((Sys.Date() - 1:20), 5, replace = FALSE)
df1 <- data.frame(date_vector1, date_vector2)
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