Collapse continuous integer runs to strings of ranges

Question

I have some data in a list that I need to look for continuous runs of integers (My brain thinkrle but don\'t know how to use it here).

It\'s easier to l

Answer 1

I have a fairly similar solution to Marius, his works as well as mine but the mechanisms are slightly different so I thought I may as well post it:

findIntRuns <- function(run){
  rundiff <- c(1, diff(run))
  difflist <- split(run, cumsum(rundiff!=1))
  unname(sapply(difflist, function(x){
    if(length(x) == 1) as.character(x) else paste0(x[1], ":", x[length(x)])
  }))
}

lapply(z, findIntRuns)

Which produces:

$greg
[1] "7:11"  "20:24" "30:33" "49"   

$researcher
[1] "42:48"

$sally
[1] "25:29" "37:41"

$sam
[1] "1:6"   "16:19" "34:36"

$teacher
[1] "12:15"