[R] overlapping intervals

[jim holtman]

Here is a more general way that looks for the transitions:

> series1<-cbind(Start=c(10,21,40,300),End=c(20,26,70,350))
> series2<-cbind(Start=c(25,60,210,500),End=c(40,100,400,1000))
> x <- rbind(series1, series2)
> # create +1 for start and -1 for end
> x.s <- rbind(cbind(x[,1], 1), cbind(x[,2], -1))
> #sort by start times
> x.s <- x.s[order(x.s[,1]),]
> # cumsum is a count of the transitions
> x.s <- cbind(x.s, cumsum(x.s[,2]))
> # c(1,2) is start and c(-1,1) is the end of an overlap
> cbind(x.s[x.s[,2] == 1 & x.s[,3] == 2, 1], x.s[x.s[,2] == -1 & x.s[,3] == 1, 1])
     [,1] [,2]
[1,]   25   26
[2,]   40   40
[3,]   60   70
[4,]  300  350


On 10/15/06, Giovanni Coppola <gcoppola at ucla.edu> wrote:
> Hello everybody,
>
> I have two series of intervals, and I'd like to output the shared
> regions.
> For example:
> series1<-cbind(Start=c(10,21,40,300),End=c(20,26,70,350))
> series2<-cbind(Start=c(25,60,210,500),End=c(40,100,400,1000))
>
>  > series1
>      Start End
> [1,]    10  20
> [2,]    21  26
> [3,]    40  70
> [4,]   300 350
>  > series2
>      Start  End
> [1,]    25   40
> [2,]    60  100
> [3,]   210  400
> [4,]   500 1000
>
> I'd like to have something like this as result:
>  > shared
>      Start End
> [1,]    25  26
> [2,]    60  70
> [3,]   300 350
>
> I found this post, but the solution finds the regions shared across
> all the intervals.
> http://finzi.psych.upenn.edu/R/Rhelp02a/archive/59594.html
> Can anybody help me with this?
> Thanks
> Giovanni
>
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-- 
Jim Holtman
Cincinnati, OH
+1 513 646 9390

What is the problem you are trying to solve?