r - How to identify the longest range of consecutive years in a list together with both the start and end date? -

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say have list of year integers follows:

olap = c(1992, 1993, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2011, 2012, 2013, 2014);

what least complicated , r-like way of identifying longest range of consecutive years both start date , end date? expect obtain: length: 10, start year: 1997, end year: 2006.

i have been searching little around web including site , people seem recommend using rle() in case. approach solve problem follows:

olap_diff_rle = rle(diff(olap)); max_diff_run = max(olap_diff_rle$lengths[olap_diff_rle$values==1]); idx = cumsum(olap_diff_rle$lengths)[olap_diff_rle$lengths==max_diff_run] + 1; max_olap_end_year = olap[idx]; max_olap_start_year = olap_end_year - max_diff_run; max_olap = max_diff_run + 1;

but appears horribly non-elegant. there must less complicated way of doing this!? want use base r though, no package. have read 1 might use which(diff()!= 1) identify breaks , continue there?

i approach diff , rle this

with(rle(diff(olap)), {     dur <- max(lengths[values==1])     end <- sum(lengths[1:which(values==1 & lengths==dur)])+1     list(duration=dur+1, start=olap[end-dur], end=olap[end]) })  # $duration # [1] 10 #  # $start # [1] 1997 #  # $end # [1] 2006

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