I am trying to create different date ranges based on 4 different start dates as follows:

> length<-c(250,100,30,10)
> dates<-for (i in length){
+   start_date<-Sys.Date()-i
+   print(as.Date(start_date))
+ }
[1] "2023-10-22"
[1] "2024-03-20"
[1] "2024-05-29"
[1] "2024-06-18"

Say the end point is Sys.Date()-1, which gives me:

> end_point<-Sys.Date()-1
> end_point
[1] "2024-06-27"

However, when I try to store the 4 different start dates into a list for data manipulation, NULL is returned after I do so:

> x<-(for (i in length){
+   start_date<-Sys.Date()-i
+   print(start_date)
+ })
[1] "2023-10-22"
[1] "2024-03-20"
[1] "2024-05-29"
[1] "2024-06-18"
> x
NULL

May I know, if I would like to save the outpot as a df, how should I go about it? Thanks.