[R] Split a DF on Date column for each single year

[Rainer Schuermann]

In your sample data.frame, MyDate and MyDes are factors; is that what you want?
rs

On Samstag, 16. März 2019 01:40:01 CET Ek Esawi wrote:
> Hi All—
> 
> I have a data frame with over 13000 rows and 4 columns. A mini data
> frame is given at the bottom. I want to split the data frame into
> lists each corresponds to single year which ranges from 1990 to 2018).
> I wanted to use the split function, but it requires a vector of the
> same length as MyDate which contains many multiples of each year.
> Any help is highly appreciated.
> 
> I want the following results:
> List 1990
> MyDate MyNo MyDes
> 1990
> 1990
> 1990
> …...
> List 2000
> 2000
> 2000
> 2000
> …...
> List 2001
> 2001
> 2001
> 2001
> 2001
> …...
> List 2018
> 2018
> 2018
> 2018
> …...
> 
> Sample data frame
> 
> mydf <- data.frame(MyDate=c("1990-01-01","1990-04-07","2000-04-05","2018-01-04"),MyNo=c(1,2,3,4),MyDes=c("AA","BB","CC","DD"))
> 
> 
> EK
> 
> ______________________________________________
> R-help using r-project.org mailing list -- To UNSUBSCRIBE and more, see
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
>