Hi I am new to R and would like to know if there is a simple way to filter data over multiple dates. I have a data which has dates from 07.03.2003 to 31.12.2016. I need to split/ filter the data by multiple time series, as per below.
Dates require in new data frame: 07.03.2003 to 06/03/2005 and 01/01/2013 to 31/12/2016
i.e the new data frame should not include dates from 07/03/2005 to 31/12/2012
Let's take the following data.frame with dates:
df <- data.frame( date = c(ymd("2017-02-02"),ymd("2016-02-02"),ymd("2014-02-01"),ymd("2012-01-01")))
date
1 2017-02-02
2 2016-02-02
3 2014-02-01
4 2012-01-01
I can filter this for a range of dates using lubridate::ymd and dplyr::between and dplyr::between:
df1 <- filter(df, between(date, ymd("2017-01-01"), ymd("2017-03-01")))
date
1 2017-02-02
Or:
df2 <- filter(df, between(date, ymd("2013-01-01"), ymd("2014-04-01")))
date
1 2014-02-01
I would go with lubridate. In particular
library(data.table)
library(lubridate)
set.seed(555)#in order to be reproducible
N <- 1000#number of pseudonumbers to be generated
date1<-dmy("07-03-2003")
date2<-dmy("06-03-2005")
date3<-dmy("01-01-2013")
date4<-dmy("31-12-2016")
Creating data table with two columns (dates and numbers):
my_dt<-data.table(date_sample=c(sample(seq(date1, date4, by="day"), N),numeric_sample=sample(N,replace = F)))
> head(my_dt)
date_sample numeric_sample
1: 2007-04-11 2
2: 2006-04-20 71
3: 2007-12-20 46
4: 2016-05-23 78
5: 2011-10-07 5
6: 2003-09-10 47
Let's impose some cuts:
forbidden_dates<-interval(date2+1,date3-1)#create interval that dates should not fall in.
> forbidden_dates
[1] 2005-03-07 UTC--2012-12-31 UTC
test_date1<-dmy("08-03-2003")#should not fall in above range
test_date2<-dmy("08-03-2005")#should fall in above range
Therefore:
test_date1 %within% forbidden_dates
[1] FALSE
test_date2 %within% forbidden_dates
[1] TRUE
A good way of visualizing the cut:
>plot(my_dt)
my_dt<-my_dt[!(date_sample %within% forbidden_dates)]#applying the temporal cut
>plot(my_dt)
