Here is a solution using the sqldf package:
> require(sqldf)
> timeline <- data.frame(time = 1:30)
> events <- structure(list(start = c(5, 13, 21), end = c(10, 16, 27)), .Names =
> c("start",
+ "end"), row.names = c(NA, -3L), class = "data.frame")
> # add event number
> events$num <- paste0("A", seq(nrow(events)))
> events
start end num
1 5 10 A1
2 13 16 A2
3 21 27 A3
>
> sqldf("
+ select t.*, e.num
+ from timeline t
+ left join (
+ select t.*, e.num
+ from timeline t, events e
+ where t.time between e.start and e.end) as e
+ on t.time = e.time
+ ")
time num
1 1 <NA>
2 2 <NA>
3 3 <NA>
4 4 <NA>
5 5 A1
6 6 A1
7 7 A1
8 8 A1
9 9 A1
10 10 A1
11 11 <NA>
12 12 <NA>
13 13 A2
14 14 A2
15 15 A2
16 16 A2
17 17 <NA>
18 18 <NA>
19 19 <NA>
20 20 <NA>
21 21 A3
22 22 A3
23 23 A3
24 24 A3
25 25 A3
26 26 A3
27 27 A3
28 28 <NA>
29 29 <NA>
30 30 <NA>
>
>
>
Jim Holtman
Data Munger Guru
What is the problem that you are trying to solve?
Tell me what you want to do, not how you want to do it.
On Fri, Feb 20, 2015 at 9:27 AM, PIKAL Petr <petr.pi...@precheza.cz> wrote:
> Dear all
>
> I know I am missing something obvious but after few hours of trials I ask for
> some help.
>
> I have some sequence of values (days)
> x <- 1:30
>
> and an indication of event start and end day
> mimo<-c(5,10, 13,16, 21,27)
>
> or
>
> events <- structure(list(start = c(5, 13, 21), end = c(10, 16, 27)), .Names =
> c("start",
> "end"), row.names = c(NA, -3L), class = "data.frame")
>
> I need to get a factor indicating event
>
> event <- c(rep(NA, 4), rep("A1", 6), rep(NA, 2), rep("A2", 4), rep(NA, 4),
> rep("A3", 7), rep(NA,3))
> factor(event)
>
> In such small example I can do it manually but I have a long vector of dates
> and would like to use start and end day of events either from mimo vector or
> from events data frame.
>
> Is there any function which does it automagically? I know I have seen it
> before but I cannot find it now.
>
> Best regards
> Petr
>
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